Shr 840

[fredw]

thanks for the info

little info about mine, this last week i compared my BB to a stock xp and found my plugs to be much darker or richer than the stocker, i also know that a 10tho shim rasing my needles will make my motor bogg a bit before it cleans up

my sled felt good this last week but i think i can maybe drop the mains from 510-490 to say 490-470, add increase the pilots one sise for a bit more fuel threw the entire range or maybe check my air.fuel screw now that i know how to adjust it... any idea what it should be set from factory at??

i should have gauges installed once the probe holders come for it

in, as leaner out is richer.

its like opening a valve in a pipe that controls water flow. opening it more makes the water come out faster. closing it slows it.

change by 1/2 turns. and 1 turn is a complete turn, i put a black mark on the slots so i can see easily where i started... i typically reset each time i adjust to see where i'm at. by that i mean i turn them all they way IN..then turn them back out. this way you know exactly where your at each time, and aren't guessing at hmm was i starting from 2 turns out...now i think i'm at 1.5 turns...
i TRY to also document where my current setup is at all times. if your good at doing that, then you dont have to do the 'reset' trick each time.

hope that makes some sense?

from my own personal experiance fuel screw effects from idle to 1/3 or so throttle..it definately seems to effect the mid range a bit more than I first assumed. adjust it slowly and see if you feel/hear (or read plugs) a difference. 1/2 turns usually will give a result.

 

[Tdubbs]

I have an '07 840 in my flatland XRS....I'm at 430 mains and .030 shim under the e-clip (800R airbox, and AAEN pipe) I think its real close...I ran it on the dyno today actually and the numbers weren't as impressive as the seat of the pants feeling you get while riding it...oh well...I'm still happy with the motor and would buy one again..

 

[Crazymtnx34]

I have an '07 840 in my flatland XRS....I'm at 430 mains and .030 shim under the e-clip (800R airbox, and AAEN pipe) I think its real close...I ran it on the dyno today actually and the numbers weren't as impressive as the seat of the pants feeling you get while riding it...oh well...I'm still happy with the motor and would buy one again..

Did you dyno the motor before the 840 was done?

 

[GF2]

Show us the dyno numbers, Just for fun eh,

 

[rotax]

i think some of its back to the good ole dyno # game, and since everyone else is playing, they have to play it too..

reguardless of actual dyno #s, the engine PULLS, and for me..is a blast to ride! so essentially thats what counts. PEAK HP #s aren't always what talks...big torque is what adds the "seat of the pants" factor.

keep seeing guys claiming 180 this 185 that, 225 here 240 there...it just makes me chuckle. i guesstimate I'm near 160ish...and if its not, its still fun so who cares!

I have an '07 840 in my flatland XRS....I'm at 430 mains and .030 shim under the e-clip (800R airbox, and AAEN pipe) I think its real close...I ran it on the dyno today actually and the numbers weren't as impressive as the seat of the pants feeling you get while riding it...oh well...I'm still happy with the motor and would buy one again..

 

[glassman]

Anyone running twin pipes on these things? Trying a set of crankshops on my 860 and cant seem to get them dailed in now. Ran great with the single.

 

[fredw]

i talked with neil at neils power pipes and he would like a sled to build them on... he feels that he can grab 10 extra hp over the single with twins

greg at jaws is suspose to be comming out with a set for the 860/885 in the new year, says he has found 20hpcool:, but once i see it i will beleive it

bikeman has gutted the stock pipe and claims to have found 6 more hp out of it!!(2oo$)

i took my y pipe and stock pipe in for ceramic coating, got a feeling i could be running it for a while

 

[bigcat_ak]

Anyone running twin pipes on these things? Trying a set of crankshops on my 860 and cant seem to get them dailed in now. Ran great with the single.

I tried Cranks and could never get them to work. Talked to Big John and he doubted I would ever get them to work since them were made to work at around 8000 rpm. Went back to a stock single and the motor came to life.

 

[SnowSnob]

I've got the new Crank Shop Mondos on my 840 and they seem to work pretty well.
I haven't got her dialed in yet though.

I'm at 440MJ but I think I'm too fat (the jets that is)
Advanced the timing 1 degree helped
Still have stock pilots and dropped stock needles 1 notch.

 

[SnowSnob]

I tried Cranks and could never get them to work. Talked to Big John and he doubted I would ever get them to work since them were made to work at around 8000 rpm. Went back to a stock single and the motor came to life.

I think when people are talking about their BB's and what works and what doesn't I think you need to specify between RKT's and SHR.
RKT's runs higher than stock rpm's like around 8500 I think and the SHR runs around stock 81000 so certain pipes will work better for certain motors.

BJ can get 3hp out of an HPS can and Kelsey loses hp...different motors...until now I guess since there running the same pistons.

I got the Cranks cause BJ got 10hp out of them but that was with his motor with his pistons, SledShed, RKT, SplitSecond all might see different results.

 

[GF2]

Well going to put 400 mains in this weekend and see how it does oil should be out of my fuel tank by now here locally we have recieved about 4' of new snow this week alone should be fun!

 

[rotax]

set my fuel adjustor to 1.25 turns out, as at 2 turns out.

the lil i let it run/idle/rev up in the garage, it still acted/sounded a bit fat.. see how it works real world soon enough!

 

[SnowSnob]

I think I'm about 3 1/2 turns out on my fuel screws.

 

[Tdubbs]

I talked with BJ today extensively about my dyno session last week and we both came to the consensus that my sled was a little rich...and also may have been overheating causing the ECM to pull timing out of the motor both driving down the RPM at powerpeak and not getting on the pipe as the motor should....real world experience with this motor so far has been nothing short of unbelieveable and I know that the dyno data must be skewed for some reason because it says that my sled makes peak power at around 7800 RPM and I know from testing that in the field it likes to REV 8000...even for a bad dyno run the torque numbers are pretty impressive

 

[summitman]

What are you guys running for clutching??

Primary-I have the 415 ramps, purple-purple pri spring, & hollow pins w/ the small set screws.

2ndary-team clutch w/ red-white spring, dont remember the cam off the top of my head.

19/45 gears w/ a 156x2 15" wide

 

[rotax]

160/290
412 ramps
16.6g (1 short & 1 long)

-04 TEAM
58/44
red/pink (140/260)
delrin washers (2x)

19/45
151x16x2.3

8k+ ft

thinking about trying a 160/350 primary spring and more pin wt...looking for a bit more top end, may not get it from the ramps i'm running... or its my clicker setting... going to play w/ clickers some this next week.

What are you guys running for clutching??

Primary-I have the 415 ramps, purple-purple pri spring, & hollow pins w/ the small set screws.

2ndary-team clutch w/ red-white spring, dont remember the cam off the top of my head.

19/45 gears w/ a 156x2 15" wide

 

[bigcat_ak]

I think when people are talking about their BB's and what works and what doesn't I think you need to specify between RKT's and SHR.
RKT's runs higher than stock rpm's like around 8500 I think and the SHR runs around stock 81000 so certain pipes will work better for certain motors.

BJ can get 3hp out of an HPS can and Kelsey loses hp...different motors...until now I guess since there running the same pistons.

I got the Cranks cause BJ got 10hp out of them but that was with his motor with his pistons, SledShed, RKT, SplitSecond all might see different results.

BJ's 830 needs to run at 8300-8500 also, which was the point of my post!!!!!!!!! Don't know about the new pipes. Mine were the older model.

 

[GF2]

Well Sat was the first time I was really able stretch the legs of my 840 and lets just say WoW very impressed .

Jetted down to 400 plugs looked great perfect have not looked at the pistons yet. I am clip richer in the needles than stock and seams to be really fat in the mid range it cleans up quick , but I dont like it . I can hold it 6000 rpm down low elev and it wont build past 900 degrees ,

I am where BJ told me to be is he putting people on the safe side , I am running 3000 to 6000 ' Who has there mid range sharp ? and where are you at with your needles.

 

[SnowSnob]

Have you tried dropping your needles 1 nothch yet?
That seems to help clean up the mid.

I went down to 420's with the CS pipes, plugs had a hint of grey/white to them and temps never hit 1100. I think I could drop the PTO side to 410's cause I have a 50+ degree difference between the 2.
Going to bring out the rave caps flush to hoepfully get a little more mid back.

 

[Crazymtnx34]

I am at 440 mains and one needle up from stock, per BJ's instructions. I ride 5500 - 8500 ft. I now have two tanks of gas through the motor, so I am ready to start really tuning. Sled is rich running 40:1 premix, so I'm starting next ride with 430's and will go down as the plugs tell me.

Where's a good place for a bore scope? Or is it better to just take the head off back at the house?