SuzukiSavage.com - Lost compression

Budro

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Lost compression
11/23/12 at 13:55:27

Well I just thought I had problem with backfires. Suddenly lost compression. Bike started fine went one block. Engine suddenly quit and no compression. I'm assuming a head gasket but thought I'd check here before pulling the head. Have done compression check and nada none zero. Seems like I'd get a little even with a blown gasket. Also I'm feeling air around the right had side of the head cover. A valve stuck open maybe?

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Lost compression Reply #1 - 11/23/12 at 13:59:14 Id check to make sure the decomp isnt hung up. If its not, then Id pull the plug & the oil fill & blow into the plug hole. If it comes out the oil fill hole, your piston may be leaking.
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28662 Tucson Az Gender:	Re: Lost compression Reply #2 - 11/23/12 at 15:47:18 justin_o_guy2 wrote on 11/23/12 at 13:59:14: If its not, then Id pull the plug & the oil fill & blow into the plug hole. If it comes out the oil fill hole, your piston may be leaking. That's gonna' require Mick Jagger lips... ...
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Lost compression Reply #3 - 11/23/12 at 17:25:27 Not if ya have a compressor.. Ive named mine Monica..
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Budro YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 27	Re: Lost compression Reply #4 - 11/23/12 at 17:28:49 Thanks for the reply. So before I start tearing it down what's the decomp? I'm thinking it has a stuck valve since it has no compression at all but I never heard of a decomp.
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ZAR

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Re: Lost compression
Reply #5 - 11/23/12 at 18:07:48

Budro wrote on 11/23/12 at 17:28:49:

Thanks for the reply. So before I start tearing it down what's the decomp? I'm thinking it has a stuck valve since it has no compression at all but I never heard of a decomp.

Budro it sounds like you do not have a manual. Before you go any further,download one and study it a while. (hint..there's a link here in the Technical Documents/Reference.....Table of Contents with links to a free service manual download).

Anyway,the "decomp" is a decompression solenoid valve that relieves the compression to make for easier starting. It's located under the chrome tin on the left front of the head. As Justin pointed out,if that "decomp" is stuck open you loose compression.

Now study,investigate,repair and let us know what you found!

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Yellow 1996 Jetted and Dunstall exhaust. Dakota Chubby Bags, Memphis Slim shield,Tank Bib from?? Seat riser mod. More to come!

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Budro

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Re: Lost compression
Reply #6 - 11/23/12 at 18:27:23

Found it and loosened the cable so that the lever is completely down. Still no compression. Motor spends much faster than before, so if the lever is down is the exhaust valve closed or open? The solenoid seems to be functioning. I get a very load click when I hit the starter button, which makes me think the exhaust valve is stuck open.

I'll get that manual downloaded.

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360k+ Serious Thumper Offline Savage heart of darkness Posts: 680 Cartersville, GA Gender:	Re: Lost compression Reply #7 - 11/23/12 at 18:27:36 ZAR wrote on 11/23/12 at 18:07:48: Budro it sounds like you do not have a manual. Without a manual you're like a blind man trying read a playboy bunny in braille. However, in either case, follow ZAR's suggestion to study & investigate, then let us know what you found.
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justin_o_guy2

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Re: Lost compression
Reply #8 - 11/23/12 at 18:35:03

360k+ wrote on 11/23/12 at 18:27:36:

ZAR wrote on 11/23/12 at 18:07:48:

Budro it sounds like you do not have a manual.

Without a manual you're like a blind man trying read a playboy bunny in braille. However, in either case, follow ZAR's suggestion to study & investigate, then let us know what you found.

Reading a PLayboy Bunny the Braille method is actually preferable.

Pull the valve covers & look..

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Budro YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 27	Re: Lost compression Reply #9 - 11/23/12 at 18:57:01 I was afraid you were going to say that. Thanks
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Lost compression Reply #10 - 11/23/12 at 19:02:37 Thats the quick easy way to know.,.10 MM, 4 bolts. Get that wrench on straight & square. NOt a good place for a stripped off head of a bolt. Properly done, these bolts will last. Many swap for better quality stuff. Mine are stock, Im careful.
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: Lost compression Reply #11 - 11/23/12 at 19:04:56 Budro wrote on 11/23/12 at 18:27:23: if the lever is down is the exhaust valve closed or open? closed, take off those inspection covers, and the header and see wassup.
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Budro YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 27	Re: Lost compression Reply #12 - 11/23/12 at 19:13:57 Took off the front cover. Turned engine over and nothing is moving. Shouldn't there be some valve moving?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Lost compression Reply #13 - 11/23/12 at 19:21:34 Yep,, valves otta be goin Up & down,, They wont do that if the cam isnt turning,
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: Lost compression Reply #14 - 11/23/12 at 19:31:31 sounds like you lost a cam chain. you'll have to take off the clutch cover to know for sure.
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