SuzukiSavage.com - zero compression

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Re: zero compression
Reply #15 - 06/18/12 at 05:08:47

justin_o_guy2 wrote on 06/17/12 at 11:37:39:

Okay, its an 04, how many miles? Recent work? Anything due to be done that you shoulda done?
Make sure the decomp isnt stuck.

How much oil went in to jack the compression to 30 PSI?

If you have access to an air hose, wrap tape or whatever around the end of a blower & pull the oil fill plug, blow into spark plug hole & see if its blowing out there. Set motor at TDC compression first.

cool, good way to check Wink

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Tom K YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 37 Brighton, CO Gender:	Re: zero compression Reply #16 - 06/18/12 at 07:09:11 Progress update... Head is off. Top of piston looks ok. Some scoring on cylinder walls. Now...Back to work.
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360k+ Serious Thumper Offline Savage heart of darkness Posts: 680 Cartersville, GA Gender:	Re: zero compression Reply #17 - 06/18/12 at 08:49:20 verslagen1 wrote on 06/17/12 at 18:34:16: might have a burnt piston. What about a burnt valve? Ever heard of a case on the Zuk?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: zero compression Reply #18 - 06/18/12 at 08:57:03 A burnt valve woulda let air out the exhaust or intake & not into the case,
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Tom K YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 37 Brighton, CO Gender:	Re: zero compression Reply #19 - 06/18/12 at 09:02:11 Top of Piston, Not bad Head, Not too Bad Ah...Here's the problem And again. Wrist pin is a bit seized up. Rings are locked into piston. Cylinder wall not horrible. Some scoring. Maybe beyond just honing. Let me know if these pics are too big.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: zero compression Reply #20 - 06/18/12 at 09:42:07 Snot pretty, but it beats a hole in the piston. What causes rings to stick like that? Oil ring go bad & let oil in behind the compression ring where it bakes in & seizes the ring?
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Re: zero compression
Reply #21 - 06/18/12 at 09:48:23

Maybe one of our experts on here can answer that.

My guess... My oil was a little low and I was fighting a head wind and at full throttle to maintain 75. The wrist pin starved for oil and got tight causing the piston to bind up in the bore and started softening the aluminum piston causing the rings to get locked in. On the front side of the piston the ring are still as they should be.

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Re: zero compression
Reply #22 - 06/18/12 at 11:12:08

When you get it back together, might I suggest using "the list oil checking method" as it keeps a slightly greater reserve of oil in the crankcase.

These bikes do use oil, especially when they get some miles on them.

This piston scoring looks like a classical case of "ran out of oil" and I bet you used the Suzuki method to check it when you did check it ....

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Re: zero compression
Reply #23 - 06/18/12 at 11:21:12

Looks like you've been using some oil for a while.

Do you have the stock petcock? The conditions you described cause low vacuum & lean mixtures which would explain that melted area on the piston.

If you think it starved for oil, check your cam & head. You should find damage there on the cam lobes & followers, & the cam "bearing" surfaces. Damage will occur here first if starvation was the problem. Cool

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28890 L.A. California Gender:	Re: zero compression Reply #24 - 06/18/12 at 11:23:40 That's what I meant by burnt piston. Piston over heated, rings are seized, can't seal on wall. How is the piston cooled? splash?
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Tom K

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Re: zero compression
Reply #25 - 06/18/12 at 11:32:34

O.F. - I generally do keep it slightly overfilled. As a matter of fact I thought I had it too full just a few days ago, but was checking with less then optimum light.

R.R. - Yep, still stock petcock. Most of the time it seems to do ok. But replacement is on my list. The cam and "bearing" surfaces still look ok. Haven't finished cleaning everything up however.

Vers - Ah. gotcha. Was thinking you meant hole.

By the way, Thanks for the replies everyone.

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zippythezip

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Re: zero compression
Reply #26 - 06/18/12 at 15:01:20

Oldfeller--FSO wrote on 06/18/12 at 11:12:08:

When you get it back together, might I suggest using "the list oil checking method" as it keeps a slightly greater reserve of oil in the crankcase.

These bikes do use oil, especially when they get some miles on them.
....

Sorry to jump in here, what is "the list oil checking method" ?

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Tom K YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 37 Brighton, CO Gender:	Re: zero compression Reply #27 - 07/22/12 at 13:58:28 UPDATE Finally got back to the bike. I really had to work at getting the wrist pin out. Galled at the conrod. It appears to have starved for oil. Now to order up a Wiseco 95mm then get to the machine shop for some over-boring. Am I correct in thinking the Wiseco for DL650 95mm piston will work?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: zero compression Reply #28 - 07/22/12 at 14:55:33 What kinda shape is the con rod in>?
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28890 L.A. California Gender:	Re: zero compression Reply #29 - 07/22/12 at 15:05:01 make sure the wrist pin hole is good and round or you'll end up the same way.
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