Hearing a slap after auto cct change and valve clearance job

[Pancala]

I did the auto CCT from a 700 raptor and a valve clearance job on my special and everything seemed to check out, rode it 50 miles and as I was going through my neighborhood I gunned it in 1st, went to shift to second and missed it, reving it up high, backfired a few times when it was calming down.. When I pulled in I started hearing the slap.. Took the auto cct out and it looks fine. So I'm not sure what happened...
Any ideas?

[skids]

If you are lucky, the slap that you heard was the HIVO primary chain. You can't really do anything to my knowledge about that. If you are unlucky, it might be that the cam chain slipped and the valve(s) are caontacting the piston(s). I would loosen or pull the spark plugs turn the crank slowly by hand, carefully feeling for any resistance. If you feel any resistance, stop turning. If you feel no resistance, check your compression. If compression is good, you are probably OK with the cam chain and the valves...

[Pancala]

It still drives and runs fine.. I just hear the slap. Didn't seem to lose power at all. What is the hivo chain?

[skids]

It still drives and runs fine.. I just hear the slap. Didn't seem to lose power at all. What is the hivo chain?

Somebody chime in here... I think the HIVO chain connects the starter with the crank gear.

[bikerphil]

The HyVo chain delivers the power from the crankshaft to the transmission. Sometimes if the bike is running roughly, such as from out of sync carbs, that chain will slap against the case and cause what you are hearing.

[Pancala]

I haven't ran through the carbs yet so that may be it. But I've put a good 400 miles on it without a hiccup until now


This is the auto cct I have. Wrong one maybe? Is it supposed to have the plastic piece at the end like the oem one?

[bikerphil]

This is the auto cct I have. Wrong one maybe? Is it supposed to have the plastic piece at the end like the oem one?

None of the auto CCT's have that plastic end, they are all just like the one in your pic.

[Pancala]

None of the auto CCT's have that plastic end, they are all just like the one in your pic.

After further listening to where the slap is coming from it sounds like a shim..the shim I remember thinking "just didn't look right".. Time to take it apart again..

[trbig]

OK.. a wild-azz guess... and something I've never actually heard happening.. maybe the shim came out of the bucket and it's slapping the bucket instead of the shim? On the way out, maybe it held the valve open a bit being cocked in there and that was the backfire? Would a cam still open the valve a bit with no shim so it still runs?

Hope you get it opened up and let us know.

[ManagerMike]

Followed by yet another wild azz guess... you did release the plunger on that auto cct after you installed it, yes?

[GLoweVA]

Mike, there is no plunger to 'release' on the auto ccts .
you take the big nut off the back, pull the spring out mount the housing put the spring in and tighten down the big nut. Done.
Not exactly that easy, because of all the steps to set up and gasket and such, but this was just an explanation of how the auto cct itself functions.

[DGXSER]

Yep, the Hyvo chain connects the crankshaft to the Primary transmission shaft. When you pull the clutch basket out, the top right hand gear in the case, that is the Primary shaft. The primary shaft also holds the starter clutch. So that is what the starter turns.

Sure can't hurt to pull your valve cover off and take a look in there. But it seems to me if a bcket came out of the bucket it would not sound liek a lsap, you would hear it gettign beat to hell inside that cover. Provided it did not make it down the cam chain galley. But the bike would run like total crap. One valve barely lifting if at all would have to sound like a miss in that cylinder.

[fredintoon]

- - - What is the hivo chain?

Hi Pancala,
a HyVo chain is a power transmission chain that runs on gear teeth instead of on sprockets. The XS11 engine uses a HyVo chain instead of a pair of gears to transmit power from the engine to the transmission which is why the XS11 engine has to run backwards.

[Pancala]

Okay so after opening the valve cover all clearances check out except I2 is on the tight side of spec and I don't have the correct shim so it stays there for now. Haha.

Tomorrow I'm going to start her up, and if the slap still concerns me I'm going to put the manual tensioner back in and see if it goes away since ive heard the acct is a little louder.

Thank you for all the input!

[Cuda 69]

I have the 700 Raptor ACCT in my SG and no noise difference at all,if anything,it runs smoother.Hope you find the problem.