SuzukiSavage.com - Cam chain jumping?

verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Cam chain jumping? Reply #15 - 09/05/11 at 10:48:04 drums1 wrote on 09/05/11 at 08:47:44: I did however, tightly cover the exhaust with some old rags You covered the outlet or the joints or the whole thing?
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BurnPgh

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Re: Cam chain jumping?
Reply #16 - 09/05/11 at 11:39:10

Oldfeller--FSO wrote on 09/05/11 at 05:03:16:

If so, that would be about the first Savage one ever .... we are blessed with reliable electrics on the Savage anyway (not like a Yamaha !!).

Still, Yamaha folks arrange an alternate ground strap for both engine and frame to the main ECU unit to PREVENT a poor ground from causing their electronics to crap out early as their black box isn't available any more on most of their 10-15 year old bikes.

While you were in there last, did you check your cam journal bearing slop?

Sloppy journal clearance can make a knock sound on the left side, and worn out rockers can make a persistent loud tapping sound (I got that coming on on my hot rodded bike so I know what that sounds like).

Both can be fixed, but are expensive in time & effort (and replacement parts).

Your timing sensor is under your alternator cover -- if the screws were loose you could get some movement/variation. Ditto if your rotor was loose on the bolt/taper/keyway.
Neither are very likely and the same cover removal checks both.

My black box went bad last year. It does happen but it didnt make anything happen like you're describing.

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drums1

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Re: Cam chain jumping?
Reply #17 - 09/05/11 at 13:12:57

Verslagen--I had a wad of rags, and covered the back end tightly--still have minor leaks at front of muffler. The idle would drop down, and probably would have stalled, but I pulled rags off just before that. The idle would then stay low until I revved it up a bit, then it would be high again. But initially plugging the exhaust would cause it to drop down. Once the engine warmed all the way up, it would just keep running fast even while plugged.

Needless to say, I'm afraid to go anywhere on it at the moment. I'm thinkin' something's gettin' ready to blow.....

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Cam chain jumping? Reply #18 - 09/05/11 at 13:22:28 I would do a compression test. I don't think backpressure will ease an issue with intake leak.
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drums1 Serious Thumper Offline '87 Savage Bashed--Down for the count Posts: 664 Racine, Wisconsin Gender:	Re: Cam chain jumping? Reply #19 - 09/05/11 at 13:24:39 I don't have a guage at home, but I can run over to where I used to work and borrow theirs tomorrow.
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drums1 Serious Thumper Offline '87 Savage Bashed--Down for the count Posts: 664 Racine, Wisconsin Gender:	Re: Cam chain jumping? Reply #20 - 09/07/11 at 05:52:37 Dammit, my buddy with the compression guage kit doesn't work there anymore--and of course his phone is unlisted. I will have to wait and buy one when it starts raining money. Until then I guess I'll rough it and hope it don't blow up far from home.
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Markusublime

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Re: Cam chain jumping?
Reply #21 - 09/07/11 at 23:01:13

The only things I've known to cause engine rpms to jump higher on a carb engine is a vacuum leak,ignition timing changes,or loose/sticking throttle plates.I'd be spraying around the carb and intake with brake clean spray (non chlorinated). If you hit a vacuum leak you'll hear the rpm drop down,and it evaporates quickly so you won't be left with a mess.

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Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12671 Fayetteville, NC Gender:	Re: Cam chain jumping? Reply #22 - 09/08/11 at 05:36:23 I like the vac slide in the carb sticking slightly due to oil getting on it, personally. Test is to apply a jigger full of Bill's magic elixir to two tanks of gas, run them both out in turn and call my nurse in the morning ..... Wouldn't happen to have recently oiled your cone air or flat filter, would you?
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drums1 Serious Thumper Offline '87 Savage Bashed--Down for the count Posts: 664 Racine, Wisconsin Gender:	Re: Cam chain jumping? Reply #23 - 09/08/11 at 07:25:03 Nope, I have a regular OE air filter. No oil involved. I am starting to lean towards the sticky slide. Although the carb was supposedly cleaned and rebuilt a few months ago at the dealer, when I had the 2 new tires installed. I think I will try the Seafoam before tearing the carb apart, yet again.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Cam chain jumping? Reply #24 - 09/08/11 at 09:07:30 Although the carb was supposedly cleaned and rebuilt a few months ago at the dealer All the more reason to suspect it. Stuff thats been worked on & CAN contribute to a problem youre having needs to be looked at.
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