RK TEK - has anyone installed the drop in kit?

[oldstyle33]

I am looking to install the drop in kit and head for my '10 XP Ptech. Has anyone done this? Do you really gain 12 HP? Did you have to adjust your clutching or jets? Is the ECM Re-program necessary?

Let me know the good and the bad of this upgrade...

Thanks

 

[mchonda2]

I did the drop in kit with the ecm remap. Nice power gain couldn't tell if it was 12hp or not, but i think it's with the $. You will have to do a little clutch adjustments.

 

[cubby]

You do have to use the factory pipe and muffler for this set up FYI

 

[oldstyle33]

I do have the factory pipe, but have an HPS can on it. Will the can really hurt the performance?

 

[pfi572]

If you follow the builders instructions and give all the correct info to Kelsey you will be happy with the results.
Just my findings from 860 and drop in piston kit on another sled.

 

[cubby]

I do have the factory pipe, but have an HPS can on it. Will the can really hurt the performance?

From what he says yes it will make a difference. So if your going to do it I would do exactly as he recommends to do if you expect it to run to it's full potential

 

[boondocker800]

I have a drop in kit and run a CPI pipe and an hps can and mine rips. No issues so far and I'm in my second season. Did do some adjusting to the clutch but nothing to drastic.

 

[Dynamo^Joe]

I had an 05/400 sled with a bone stock 03/800 engine and ran it on the dyno.
It made 136.7hp at 7850 rpms.
Put the drop in piston kit on with ecu curve and calibrate jetting 2 sizes rich, plug and gap, and made ring-end-gap as kelsey mentioned.
Ran the sled for some miles dialing in clutch for a few afternoons then went back on the dyno.
Dyno revealed 144.5 hp at 8300 rpms for increase of 7.83hp @ 390 main
Went to 370 and dyno showed 146.1hp for gain of 9.47hp

I ended up running 1 size rich than recommended because sometimes I have to mix in 89 octane and there are a few places in the backwoods where I can be full throttle for 30+ breaking trail if I wanted.

So for me it delivered a pretty big smile on my face after seeing even 7.83hp gain, an excellent $/hp ratio.

Oh...and I used the stock suitcase muffler as I like quiet.

Here is a clutch kit customer of mine running the RKTPDI in his 08 (late season in Sweden) rev's like 8300 sounds good)
Calibration if I remember right is...
200/350
21 grams
413 ramps
clicker 4
QR11 helix
19:45 gearing

I get my customers with 800R engine to run same clicker but one gram lighter pinweight to go from 8150 to 8300 or can take do nothing else in the system except take the primary spring final force and raise it 30 lbs.
I submit, follow kelsey's guide on engine calibration, then clutch calibration will be quick to change to satisfy achieving correct rpms.

 

[byeatts]

I had an 05/400 sled with a bone stock 03/800 engine and ran it on the dyno.
It made 136.7hp at 7850 rpms.
Put the drop in piston kit on with ecu curve and calibrate jetting 2 sizes rich, plug and gap, and made ring-end-gap as kelsey mentioned.
Ran the sled for some miles dialing in clutch for a few afternoons then went back on the dyno.
Dyno revealed 144.5 hp at 8300 rpms for increase of 7.83hp @ 390 main
Went to 370 and dyno showed 146.1hp for gain of 9.47hp

I ended up running 1 size rich than recommended because sometimes I have to mix in 89 octane and there are a few places in the backwoods where I can be full throttle for 30+ breaking trail if I wanted.

So for me it delivered a pretty big smile on my face after seeing even 7.83hp gain, an excellent $/hp ratio.

Oh...and I used the stock suitcase muffler as I like quiet.

Here is a clutch kit customer of mine running the RKTPDI in his 08 (late season in Sweden) rev's like 8300 sounds good)
Calibration if I remember right is...
200/350
21 grams
413 ramps
clicker 4
QR11 helix
19:45 gearing

I get my customers with 800R engine to run same clicker but one gram lighter pinweight to go from 8150 to 8300 or can take do nothing else in the system except take the primary spring final force and raise it 30 lbs.
I submit, follow kelsey's guide on engine calibration, then clutch calibration will be quick to change to satisfy achieving correct rpms.

Did you add compression? Glad to see a controlled test.

 

[Dynamo^Joe]

Did you add compression? Glad to see a controlled test.

No...I told kelsey that I run 91 octane one way and 89 octane upon return so it would be a blend of mix lower octane fuel upon return.
Im sorry I do not remember what the compression is and I don't know where those notes are anymore, I think they are on an old computer I used to have that's archived.

 

[oldstyle33]

Does anyone know what the compression with the new RKTek head is? Also, if I ran this set up at sea level would I have to run higher octane? Does it have to be rejetted? I live in Nebraska and would like to run it at sea level and from 8-12K.

Thanks!

 

[cjgodden]

The domes are interchangeable so you can run whateven compression ratio you want. Call Kesley and tell him where you ride and elevation. He will set you up with a drop-in kit that meets your needs.

 

[JedInUtah]

Here is a clutch kit customer of mine running the RKTPDI in his 08 (late season in Sweden) rev's like 8300 sounds good)
Calibration if I remember right is...
200/350
21 grams
413 ramps
clicker 4
QR11 helix
19:45 gearing
14:1 Compression
91 pump
6k-10.5k

Another setup for REV using your kit.
2005 summit 800 RK Tek Dropin with DJ clutch
160/380
15.3 grams
415 ramps
clicker 4-5 (Clicker 6 above 9500 ft.) Under 9500 clicker 5 will show overrev on trail.
Target RPM 8400 tach
SMT helix
19:45 gearing

Runs great!!

 

[Dynamo^Joe]

Another setup for REV using your kit.
2005 summit 800 RK Tek Dropin with DJ clutch
160/380
15.3 grams
415 ramps
clicker 4-5 (Clicker 6 above 9500 ft.) Under 9500 clicker 5 will show overrev on trail.
Target RPM 8400 tach
SMT helix
19:45 gearing

Runs great!!

Buddy, lets see a vid of your sled at full throttle.
if it is less than 25mb, email it to me.

 

[Norway.xp]

I had an 05/400 sled with a bone stock 03/800 engine and ran it on the dyno.
It made 136.7hp at 7850 rpms.
Put the drop in piston kit on with ecu curve and calibrate jetting 2 sizes rich, plug and gap, and made ring-end-gap as kelsey mentioned.
Ran the sled for some miles dialing in clutch for a few afternoons then went back on the dyno.
Dyno revealed 144.5 hp at 8300 rpms for increase of 7.83hp @ 390 main
Went to 370 and dyno showed 146.1hp for gain of 9.47hp

I ended up running 1 size rich than recommended because sometimes I have to mix in 89 octane and there are a few places in the backwoods where I can be full throttle for 30+ breaking trail if I wanted.

So for me it delivered a pretty big smile on my face after seeing even 7.83hp gain, an excellent $/hp ratio.

Oh...and I used the stock suitcase muffler as I like quiet.

Here is a clutch kit customer of mine running the RKTPDI in his 08 (late season in Sweden) rev's like 8300 sounds good)
Calibration if I remember right is...
200/350
21 grams
413 ramps
clicker 4
QR11 helix
19:45 gearing

I get my customers with 800R engine to run same clicker but one gram lighter pinweight to go from 8150 to 8300 or can take do nothing else in the system except take the primary spring final force and raise it 30 lbs.
I submit, follow kelsey's guide on engine calibration, then clutch calibration will be quick to change to satisfy achieving correct rpms.

Hi Joe
Not a big deal, but the vid. is not from sweden. its from Norway.
And the sled is mine.
Gearing was 21:49

Lasse

 

[DOOingitUtah]

Buddy, lets see a vid of your sled at full throttle.
if it is less than 25mb, email it to me.

Joey,

I can say that with my bro's set up...I have yet to see a rev run like that!!!!! I'd say it is a combo of the drop in kit and the clutching......I have an 860 xp 800 with 2.5 CE track and the rev keeps right up.....what are you finding runs best on the XP's these days...been a while since we talked. I haven't done much research and haven't seen what helix you have out now. Keep hearing the straight helix on the 12's is working well. Thoughts?