http://www.youtube.com/watch?v=oMAWsDInazs Maybe one of the links might work but if not try to copy and paste. So this is a video of my 09 xp summit and was wondering if the knocking sound is normal for these sleds. It is kinda hard to here but after it idels down it the knocking sound. I just install a clutch kit and cant tell if it is coming from the clutch or if its the motor. Dont think i srewed anything up with the kit. I watch another youtube vid of an xp and thought i could here his sled sound like this as well.
Thanks for looking

I had this problem at the end of last year a d I think it is In the clutch.

I had the same knock on one of my Renegades and found it to be the starter pinion hitting the ring gear. (Loose Starter bolts)

Started looks good, and found out that it dont seem to start knocking untill after a few of times of reving it up or maybe it warms up then starts it. I will have to take the clutch back apart but i would think if it was the clutch it would do it right on the start up.

Check the primary bushings, slider buttons (for wear on the sides) and the o-rings under the buttons, and arm pivots for excessive slop. Sounds like clutch.

It could be the carbs hitting the tunnel or the air box hitting the tunnel.

Try it again - but this time try pressing against the back of the air box to raise it off the tunnel. JUST MAKE SURE YOU DON'T CATCH YOURSELF IN THE CLUTCH AND BELT! It could have serious consequences.

The sled has 160 mile on it so i dont know if the stuff wears that fast or if i would have screwed somethig up. Dont know what though. Took the clutch apart all looked good. You can tell were the buttons have been sliding but i no expert to say if they are wore or not. All rubbers look goog.

put the clutch back on and same thing. It is once the sled comes down to the idle when it starts. I can take the engine at idle (somewhere around 2000rpms) and and slightly give it gas to take the engine up a few rpms and the noise stops. Clutch still being disengaged. So that being said will them few rpms make the clutch spin any faster to make the noise go away if that is where it is coming from. If not then it must be coming from somewhere else. Is almost makes me think like the engine timing is retarded at idle making it knock untill givin some gas?? dont know just thinking.

Tried the air box thing, not it but i would have never thought of that if it was. It is so hard tring to tell where the noise is coming from. I guess i could put the stock pins and spring back in and try that and see what happens.

My summit 800 xp -09 makes the exact sound, and i have no idea what it is, or if its a bad sound. maybe its suppose to sound like that??
you'll have to excuse my spelling im from Sweden:)

Tompaahman did you do anything to your primary clutch?? Should have done a serch on this before until now but i found this posting. What does he mean about tighter pins for the arms??? Do they make different size pins for the arms??



http://www.dootalk.com/forums/index.php?sh...=knocking+sound

Mine was doing it last year as well brand new but now it has over 1000 miles and i have not noticed it. CHecked everything. I am pretty sure there is a few threads about it becauase I looked last year and quite a few others said they heard it as well. lots of suggestions and thoughts but I am not sure anyone narrowed it down and solved the mystery. Mine is an 09 Gade X 800R

My '04 made that noise on cold mornings, only at idle, The first time it did it I was like *%@ is that. I thought for sure the clutch was going to explode. After about 5 mins it would go away. Tried to figure it out, pulled the primary, it looked okay. Cleaned it, put it back in and Clang, Clang, Clang it would do it again on a cold morning. Figured the buttons or o-rings were getting work and rode her anyways.

Now on a sled that has very few miles on it, I would put a stethoscope or one of them brass bars on the cyclinders to check if the noise is coming from there to make sure its not the motor. Have you blown any belts? Maybe some debris around the primary or gotten into it and the arms aren't moving freely?

I'd have to say it's normal. When the primary is a idle - that is to say there is not enough RPM to engage the arms pushing against the ramps, you're going to get some knocking as everything is loose (at idle), as soon as you increase RPM and engage the arms pushing against the ramps - no more bang bang.

The arms will or roller at the end of the arms will bounce between the spring cup and ramp when there's no pressure against them.

Here's a couple pics that might help you see what I'm talking about. You should be able to hold the primary in your hands and shake it, you should hear some clicking, that's the arms.

Also the moving sheave just floats on the shaft - so at idle it will rattle a bit.

I havent done anything to the clutch, i just bought my summit and havent really tried it on yet. but im kind of nervous that this is a serious problem. it didnt sound anything when the motor was cold but after a few laps on the lawn it started. kind of sounds like an old tractor....

clutch is clean and engine seem to run good. Most of the post say vibrations and rattling. The one post sounds like the closest to mine. instante message the dootalker that started the post and asked him to listen to the video and what he did to fix his. So hopefully he will respond. Thanks for everyone input, will try the stock clutch setup tomorrow and let everyone know.

The knocking is even worse if you have ramps like the 417's where the first part of the ramp has more angle.

Have the stock ramps but do you think that little bit of gas to take the rpms up could spin the clutch a little faster to make them stop even with the clutch still being disengage? Im thinking you could be on to something. Like i said the engine and sled seems to run good the couple of times i took it up and down the field in the grass.

Just had my 08 154 in to the dealer for the same knock sound. A & E said it was the arms in the clucth knocking against the ramps when coming back to idle.I had just cleaned the clutch and the knocking started when i put the clutch back on.Does it about 3000 RPM?

This is the best explanation I have heard and seems to make sense. Would also seem the reason why some sleds make the noise and some due not (ie. Tolerances). 03800, I sent you a PM as well. When I take my clutch apart I am going to tape up the end of these arms so that I get a snug fit on the ramps and see if the noise goes away at idle and if it does then I will feel better that it is a non issue.

Been my experience that the TRA gets noisy especially at low rpm's. It don't take long for the button o rings to wear as well. I replace them every year. Also the number that your clickers are set on will change the rattle as it changes the angle of the ramp as the arm loosly rides on the ramp due to lack of centrifical force. Try changing clicker numbers to 1 or 6 and see if that changes the noise? Hope this will help.

Irondog, I am running the 417's. No noise like that at all.

yeah i notice it after i put the kit in and cleaned the clutch as well. Not to say it was not thier before i took the clutch apart but i never realy notice it. I am starting to think it is the arms as well. Would like to know if the tape on the arms work. Also heard that a guys said something about putting in tighter arm pins. Dont really know what this means, is there a bigger pin?? This was in the other topic link on page one if anyone else would like to read it.

I haven't heard of larger pins, if they are sloppy then it is time for new arms. I bought an older Rev for my son it had a Comet clutch on it and the original TRA in a box because the guy said it rattled. I got a new set of bushings and o-rings put the TRA back on and it was quiet. I would check the bushings to make sure the rings didn't slip out of place.

Any more ideas on this? I have a sled with the identical noise when riding.....does it around 4-5000rpm both accelerating and decellerating....VERY noticable when riding. Has all new bushings, buttons and o-rings, clutch is PERFECT. I am around alot of TRA's and this is the first I have noticed this. There is the classic "TRA at idle" rattle, but this is more of a knock, like in that video. Same sled has .0015" crank runout and runs good otherwise.

Our 06 was making this noise and we could not find it, Finally put a new set of take off primary arms from the 07 and was silent for ever more,The noise sounded like a cross between a knock and a buzz

I put a clutch kit on my 09 summit as well and it makes the exact same noise while idoling as well with only 400 miles on doesn't seem to be an issue but doesn't sound right either.

Nice arms you got there ID! Are those Dalton's and what weights you usin?

I pulled this primary apart again this morning, found that the dealer has ground down the sides of the arm pivot bushings by over .050"! Lots of side-to side slop...putting in new arms and pins and will report back if that was the source of noise in this case.
Alot of the TRA7's have sticky arm pivots from the factory and some dealers are cleaning the pivot pins with steel wool....I would recommend agains this as it removes the coating that prevents corrosion, then they corrode and they may bind even more....just clean them with some brakleen. This dealer went as far as grinding down the sides of the bushings to free the arms...again, not necessary.

No, they're Tom's Snowmobile custom cut billet arms, 44.7 gr arms, 10.8 gr pins, 160/290 spring and 412 ramps. I'm at sea level.

Here's a post from last season. http://www.dootalk.com/forums/index.php?sh...t=0&start=0

Winterbrew, I agree 100%. You don't want sticky or sloppy arms.

Wasn't sure, so Tom's does a great clutching kit as well as his EVOL AIR rear KIT?

He does kits, but he also does a lot of testing & R&D on his own parts. He's got his own dyno, so he can test different set-ups and do all his own R&D in house. Then he has guys throughout the snowbelt doing field testing in different conditions and giving feedback.

Several people were testing these arms last season and giving feedback to Tom. We had a couple sets here in AK. doing low altitude testing last season - the arms proved to be a big improvement over stock. Anyone that rode my sled could tell it had some special as soon as they got on it. Some thought I had a BB kit, some knew it was clutching, others just thought their sled was a POS and mine was set-up better - but all agreed it had great upshift and help RPMs like it was a tractor.

looking forward to here what you found out winterbrew. Before i put my clutch back together i notice my arms were not moving to freely. So i used a whole can of carburator cleaner on them. Worked them and was able to get them moving alot better. Well what i thought would be better, maybe by doing this, it might have started my noise, or might be the 20.5g of pin weight i added to the end of the arms. Been busy hunting, and working so have not be able to tear back apeart and put stock iin and see if noise goes away. Will wait on winterbrew's findings fierst

did u find out what was causing it? my new '10 800 everest does the same thing, with only 260 kms.

my 09 did make noise after i put in clutch kit. what i found was idle rpms dropped to 1800 because of extra pin weight. raised idle back up to 2000 and all noise went away..just what worked for me

My 08 started this nice little knock mid-January. Exact same sound on let off, I could hear that same knock-knock-knock on let off and idle (at 24-27sec., 49-53sec., and at 118-123sec. on your video). It did not get better or go away and finally the mag cylinder went down two weekends ago. A bunch of money later I am hoping to have my sled back this weekend.

Have you done a compression test?

Please advise what you find, because when I pick my sled backup this weekend its going to be costing me a small bundle of money for a motor job that is not going to be warrantied.