155" track. 8g in the heel, 2g in the mid, and .8 in the tip. IDK maybe I'm doing it all wrong... Stock gearing.
RK Tek drop in kit
- Thread starter ProRMK24
- Start date
ProRMK RkTek Rev 2?
Hey guys, im new to this forum and im looking for some advice. I just bought a 2014 Pro RMK 800 and am looking for some ways to boost my HP in order to out-do my buddies ski-doos and AXYS sleds. Im really considering the rk tek rev 2 kit, but have also thought about waiting a year and going all out with a turbo. Im also trying to stick to a budget of no more than $1000. I just dont know what will be the best bang for my buck. If you guys have any ideas or tips for me, itd be much appreciated.
Hey guys, im new to this forum and im looking for some advice. I just bought a 2014 Pro RMK 800 and am looking for some ways to boost my HP in order to out-do my buddies ski-doos and AXYS sleds. Im really considering the rk tek rev 2 kit, but have also thought about waiting a year and going all out with a turbo. Im also trying to stick to a budget of no more than $1000. I just dont know what will be the best bang for my buck. If you guys have any ideas or tips for me, itd be much appreciated.
R
Reddragon800
Well-known member
Stay away form the Rktek stuff. Long story short, you wont be happy with the results. If you looking to stay under 1000, look at MTNTK's drop in kit. Its there fix kit and a high compression head. Good for 7.5hp. I think that's around $700. If you are ok with spending a bit more cash, there full mod kit makes a real 21 hp and rips. best $2500 I have ever spent!!
Why do you say stay away from rktek? Have you had bad experience with their products? I looked at Mnttk, and it seemed like rktek's 20hp for $950 was better than mtntk's 7hp for $700.
R
Reddragon800
Well-known member
That's why I said to stay away from the RkTek stuff..... they claim huge HP gains when it doenst acutaully make any more power. I had his so called 20hp kit and had it dyno'd and it make the same power as stock, but at 8450 RPM. This was his original Rev 1 kit with his head. its a pain to clutch for that high RPM. MTNTK actually dyno's there product and you can be confident in what you paying for.
Reddragon...
I do agree that the HP numbers may be off for some... all depends on a lot of variables...fuel, assembly, engine condition, fuel system condition including fuel filter etc etc etc...
I've followed your posts from before on this Reddragon...and I mean no disrespect... I'm just trying to ask the right questions as a moderator.
In your previous posts, you never mentioned a dyno run of your first-series RKT kit .... except for commenting on FinRMK's RKT 858 RKT Big Bore dyno run.
Where and when did you have your sled dyno'd... any numbers from those runs?
You said that you had his Drop in kit, the first series without the spacer (RKT's 12hp kit) ... and that your sled came with it already installed when you bought it.
You also say in later posts that you had to have your cylinders re-done... that may have contributed to your poor results... could have been the previous owner running it too lean... or hundreds of other factors. What are your thoughts on that?
Please help us clarify your past and recent posts.
So that I'm clear...and not misconstrued... I believe that the MTNTK kits are good offerings... I've installed one of them for a friend, and he was satisfied with it for sure.
I do believe that you were not happy with the RKT kit and you are happy with the MTNTK kit.
IMO, I would expect a kit with the spacer to perform better than a kit without it... same brand or different.
Pray for snow!!
.
I do agree that the HP numbers may be off for some... all depends on a lot of variables...fuel, assembly, engine condition, fuel system condition including fuel filter etc etc etc...
I've followed your posts from before on this Reddragon...and I mean no disrespect... I'm just trying to ask the right questions as a moderator.
In your previous posts, you never mentioned a dyno run of your first-series RKT kit .... except for commenting on FinRMK's RKT 858 RKT Big Bore dyno run.
Where and when did you have your sled dyno'd... any numbers from those runs?
You said that you had his Drop in kit, the first series without the spacer (RKT's 12hp kit) ... and that your sled came with it already installed when you bought it.
You also say in later posts that you had to have your cylinders re-done... that may have contributed to your poor results... could have been the previous owner running it too lean... or hundreds of other factors. What are your thoughts on that?
Please help us clarify your past and recent posts.
So that I'm clear...and not misconstrued... I believe that the MTNTK kits are good offerings... I've installed one of them for a friend, and he was satisfied with it for sure.
I do believe that you were not happy with the RKT kit and you are happy with the MTNTK kit.
IMO, I would expect a kit with the spacer to perform better than a kit without it... same brand or different.
Pray for snow!!
.
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spturck,
To give you some background...
Kelsey (RKT) in his posts on here in the past has been abrasive, which may have offended ardent supporters of other shops work...and he makes claims that I feel may promote his products a bit much.... but so do most of the proud engine kit builders out there.... they are all proud of what they offer.
Kelsey battled with other builders on here and they battled too... and no one came out better for it all in the end. Now, because if this, you will find that none of the builders really want to come on here to discuss their products...
It's happened across the board...ARGH.
This battling has also re-doubled the dedication of supporters to their respective kits and to makers of those kits.
You will find that this is an emotional issue on here... that is taken very seriously by some that support their "home team" to the core.
I feel fortunate that I've been able to remain friends with all of these builders... but it was a difficult process... Kind of like being the friend in a divorce where you were friends with both side in the first place.
Sort through all of the info on these forums and in these threads if you have the time... try to take the emotion out of the presentations and you will find the kit that works for you.
.
.
To give you some background...
Kelsey (RKT) in his posts on here in the past has been abrasive, which may have offended ardent supporters of other shops work...and he makes claims that I feel may promote his products a bit much.... but so do most of the proud engine kit builders out there.... they are all proud of what they offer.
Kelsey battled with other builders on here and they battled too... and no one came out better for it all in the end. Now, because if this, you will find that none of the builders really want to come on here to discuss their products...
It's happened across the board...ARGH.
This battling has also re-doubled the dedication of supporters to their respective kits and to makers of those kits.
You will find that this is an emotional issue on here... that is taken very seriously by some that support their "home team" to the core.
I feel fortunate that I've been able to remain friends with all of these builders... but it was a difficult process... Kind of like being the friend in a divorce where you were friends with both side in the first place.
Sort through all of the info on these forums and in these threads if you have the time... try to take the emotion out of the presentations and you will find the kit that works for you.
.
.
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I've bought and paid for an RKT second series (REV-2) kit with the spacer and the BD controller to run this year in my ProRide.
I made this decision based on my past personal experience with RKT Ski Doo kits, RKT replacement pistons that I've installed for others, conversations with Erik Woog & Jeremy Kinzer and the dyno results from www.dynotechresearch.com.
I do concede that the dyno numbers were at low elevation... wish we had a dyno lab that was that thorough above 6000ft!
I read Jeremy Kinzers write ups on the many RKT installs he's done and spoke with him on the phone about them. He was super happy with the results. I also believe that RKT uses quality products and design in their offerings.
I also installed a series 1 RKT kit into a friends sled 2 seasons ago...and also ran a fuel controller as I wanted that flexibility in tuning...Chuck is happy with his sled... and has 1800 miles on it without issues to date... and will be running it again this year with the same pistons and good oil!
I expect this second series RKT drop in kit, that has the spacer, to perform better than the first series kit that does not.
Erik Woog (VOHK) was the final person that convinced me of the RKT kit merits.... he's a pretty picky guy, and I know him well enough that I know he wasn't promoting something he didn't believe in.
I'll be happy if my sled performs well and remains durable throughout the season.
I believe that the added case volume of the spacer helps the motor to "breathe" better... in a similar way that the added case volume of a smaller volume crankshaft in the AXYS-800HO does... the REV-2 RKT kit has this spacer as do others.
My opinion is the same as others... my opinion.
Is this the only 800 CFI-2 engine kit on the market.. Not by a long shot.
Do others take a different approach. Yes
I believe/hope I have made a good choice... time will tell if I'm still happy with it at the end of the season.
BTW...RK-Tek's 20 HP claim was based on before and after dyno runs at Dynotech...that was where he was pulling his numbers from....
The report shows the Dynotech run was done, first, with a stock sled... and showed 141 HP at sea level....
The report shows, when the Series-2 drop in kit was added, with V-force reeds, fuel controller, NO pipe, no porting it made 161hp at sea level. .
It's a long read...but you will see what he bases HIS numbers on. Again... lots of variables for every individual. just that this was RKT's source on HIS claim. Just an FYI on where I'm seeing his numbers come from.
dyno results.
And before anyone gets all wadded up about dyno numbers... I'm also a believer in "seat of the pants" dyno's... for each sled... but a dyno run can be a very good tool to have in the ole box.
.
I made this decision based on my past personal experience with RKT Ski Doo kits, RKT replacement pistons that I've installed for others, conversations with Erik Woog & Jeremy Kinzer and the dyno results from www.dynotechresearch.com.
I do concede that the dyno numbers were at low elevation... wish we had a dyno lab that was that thorough above 6000ft!
I read Jeremy Kinzers write ups on the many RKT installs he's done and spoke with him on the phone about them. He was super happy with the results. I also believe that RKT uses quality products and design in their offerings.
I also installed a series 1 RKT kit into a friends sled 2 seasons ago...and also ran a fuel controller as I wanted that flexibility in tuning...Chuck is happy with his sled... and has 1800 miles on it without issues to date... and will be running it again this year with the same pistons and good oil!
I expect this second series RKT drop in kit, that has the spacer, to perform better than the first series kit that does not.
Erik Woog (VOHK) was the final person that convinced me of the RKT kit merits.... he's a pretty picky guy, and I know him well enough that I know he wasn't promoting something he didn't believe in.
I'll be happy if my sled performs well and remains durable throughout the season.
I believe that the added case volume of the spacer helps the motor to "breathe" better... in a similar way that the added case volume of a smaller volume crankshaft in the AXYS-800HO does... the REV-2 RKT kit has this spacer as do others.
My opinion is the same as others... my opinion.
Is this the only 800 CFI-2 engine kit on the market.. Not by a long shot.
Do others take a different approach. Yes
I believe/hope I have made a good choice... time will tell if I'm still happy with it at the end of the season.
BTW...RK-Tek's 20 HP claim was based on before and after dyno runs at Dynotech...that was where he was pulling his numbers from....
The report shows the Dynotech run was done, first, with a stock sled... and showed 141 HP at sea level....
The report shows, when the Series-2 drop in kit was added, with V-force reeds, fuel controller, NO pipe, no porting it made 161hp at sea level. .
It's a long read...but you will see what he bases HIS numbers on. Again... lots of variables for every individual. just that this was RKT's source on HIS claim. Just an FYI on where I'm seeing his numbers come from.
dyno results.
And before anyone gets all wadded up about dyno numbers... I'm also a believer in "seat of the pants" dyno's... for each sled... but a dyno run can be a very good tool to have in the ole box.
.
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R
Reddragon800
Well-known member
Hey Mountain horse
Lots of questions there!!! Where to start. In regards to the Rev1 kit I had and the 858, theses are kits that have false promises!! I am not a professional engine mechanic, however, I do know that just adding some pistons and a head will not give you 12-20 hp!! If it was that easy, everyone would have a kit like that. yes, it will give a bit more power.... maybe!! Now adding 60 cc and a head isn't going to make 25 hp or what it is that he claims. Raising the port timing just alters the way the powerband delivers the power. which is why his motors all spin at 8400-8550 rpm. To me its just a sales gimmick.. when I asked for help on why his kit couldnt pull stock weights, he said my crank run out was too much. I did everything he told me.. but I couldn't even pull 62 gram weights on stock clutching at 6800 feet. he wouldnt tell me his secret special cut helix, so how em I supposed to clutch my sled! It was so frustrating dealing with him. When I tore the motor down, everything was within spec, but I found a small crack in the PTO side cylinder skirt, so I bought a new one and had MTNTK port it and got there full mod kit. Now I can pull 68 gram weights with a steeper helix and soft primary and secondary spring. The other thing is guys say they can pull 66 gram weights, but all the weight is in the heel. I running team 10-68 gram weights. the shift much different. They have rooster weights or MDS if there is no weight in the tip than sure, you can pull big weights. I bet if they ran 10-68, they would drop a bunch of RPM. anyways.. rant over.
The dyno results from dynotech are with a very leaned out fuel map, timing key, high compression head, pipe, and reeds....... That's exactly what MTNTK sells. So how does Kelesy sell a head and pistons that makes 20 HP.... see how this looks so bad now!! I don't know why people buy his BS sales pitch. anyways I have said it so many times. buy MTNTK and you have a great honest product that makes good power. Shawn has been really good to me and is always willing to help out when he can.
AS for dyno numbers, the kit that I have makes 148 hp at 6000ft. That's how high Ashton Idaho is. So factor in the 3% for every 1000 feet, 148 x 1.18 = 174.6HP...
Everyone that has driven my sled was very impressed with the "seat of the pants" pull it has.
Enough with the ranting... im sure there are some people that are happy with his stuff.... I have learned that there is better and honest companies to work with. hopefully everything will work out for you.
Lots of questions there!!! Where to start. In regards to the Rev1 kit I had and the 858, theses are kits that have false promises!! I am not a professional engine mechanic, however, I do know that just adding some pistons and a head will not give you 12-20 hp!! If it was that easy, everyone would have a kit like that. yes, it will give a bit more power.... maybe!! Now adding 60 cc and a head isn't going to make 25 hp or what it is that he claims. Raising the port timing just alters the way the powerband delivers the power. which is why his motors all spin at 8400-8550 rpm. To me its just a sales gimmick.. when I asked for help on why his kit couldnt pull stock weights, he said my crank run out was too much. I did everything he told me.. but I couldn't even pull 62 gram weights on stock clutching at 6800 feet. he wouldnt tell me his secret special cut helix, so how em I supposed to clutch my sled! It was so frustrating dealing with him. When I tore the motor down, everything was within spec, but I found a small crack in the PTO side cylinder skirt, so I bought a new one and had MTNTK port it and got there full mod kit. Now I can pull 68 gram weights with a steeper helix and soft primary and secondary spring. The other thing is guys say they can pull 66 gram weights, but all the weight is in the heel. I running team 10-68 gram weights. the shift much different. They have rooster weights or MDS if there is no weight in the tip than sure, you can pull big weights. I bet if they ran 10-68, they would drop a bunch of RPM. anyways.. rant over.
The dyno results from dynotech are with a very leaned out fuel map, timing key, high compression head, pipe, and reeds....... That's exactly what MTNTK sells. So how does Kelesy sell a head and pistons that makes 20 HP.... see how this looks so bad now!! I don't know why people buy his BS sales pitch. anyways I have said it so many times. buy MTNTK and you have a great honest product that makes good power. Shawn has been really good to me and is always willing to help out when he can.
AS for dyno numbers, the kit that I have makes 148 hp at 6000ft. That's how high Ashton Idaho is. So factor in the 3% for every 1000 feet, 148 x 1.18 = 174.6HP...
Everyone that has driven my sled was very impressed with the "seat of the pants" pull it has.
Enough with the ranting... im sure there are some people that are happy with his stuff.... I have learned that there is better and honest companies to work with. hopefully everything will work out for you.
Helix
To the people that have noticed gains with these kits and like them. What did you run for secondary clutching? Did you go with Kelsey's custom ground helix? Stock, etc?
Just to throw it out there. I have thrown a couple of his Rev 1 kits on IQR 600r/800 monoblock conversions and definitely noticed a seat of the pants increase. We did throw one on the older 09 cylinders, and that even felt better, not as much gain as we felt with the 11+ cylinders. But the 09's where better just by them selves to start with compared to the 11+.
To the people that have noticed gains with these kits and like them. What did you run for secondary clutching? Did you go with Kelsey's custom ground helix? Stock, etc?
Just to throw it out there. I have thrown a couple of his Rev 1 kits on IQR 600r/800 monoblock conversions and definitely noticed a seat of the pants increase. We did throw one on the older 09 cylinders, and that even felt better, not as much gain as we felt with the 11+ cylinders. But the 09's where better just by them selves to start with compared to the 11+.
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