SuzukiSavage.com - PISTON NOISE

MMRanch Serious Thumper Offline Evil flourishes if Good Men do Nothing. Posts: 5835 LYNCHBURG TN Gender:	PISTON NOISE 08/29/09 at 21:22:44 ANYBODY EVER HAVE A CRACKED PISTON? i BEEN GETTING A THRODLE RELATED WACK OUT OF THE HEAD OR TOP OF THE BLOCK FOR THE LAST COUPLE OF THOUSAND MILES. SOUNDS ALMOST LIKE THE PISTON PIN AREA IS CRACKED AND GIVING WAY UNDER LOAD. IS THIS A COMMON (NATURE OF THE BEAST) THING OR SHOULD I LOOK DEEPER INTO IT? THANKS
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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: PISTON NOISE Reply #1 - 08/29/09 at 22:46:56 look for the "I hear you knockin' " and redux threads
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: PISTON NOISE Reply #2 - 08/29/09 at 23:30:30 You might give some thought to poking that caplocks button.
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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: PISTON NOISE Reply #3 - 08/29/09 at 23:38:34 yes, before he pushes your mute button.
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Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12671 Fayetteville, NC Gender:	Re: PISTON NOISE Reply #4 - 08/30/09 at 02:26:13 We have a history of eating up piston skirts and making some slap noise on the bikes that have been run right hard -- yours might fit into that category from what we saw at the Dragon run this past summer.
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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: PISTON NOISE Reply #5 - 08/30/09 at 05:19:23 Over size tires is hard on the little 650 motor.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: PISTON NOISE Reply #6 - 08/30/09 at 05:19:42 How does a guy figure out if his engine noise is that of a healthy thumper or that of one needing a new piston?
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Toymaker Serious Thumper Offline Dragon Rider Posts: 1534 Granite Falls, NC Gender:	Re: PISTON NOISE Reply #7 - 08/30/09 at 07:43:14 yeah?...I wanna know too.
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Boule’tard

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Re: PISTON NOISE
Reply #8 - 08/30/09 at 08:56:29

<blind stab>
Make sure you're not lugging the engine in too high a gear or running tainted gas. Switch to a different brand, premium gas for a couple of tankfuls, and pay attention to the noise as it relates to engine RPM and throttle position. If the noise only occurs with the cheap gas or under open throttle/low RPM conditions.. like the doctor said to the patient with the elbow.. don't do that

</blind stab>

Otherwise, get in there and replace the piston, rings, and hone the cylinder. Might be a good opportunity for some hop-ups Wink

Sorry if these suggestions are too basic and you already tried them.. just checking.

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MMRanch Serious Thumper Offline Evil flourishes if Good Men do Nothing. Posts: 5835 LYNCHBURG TN Gender:	Re: PISTON NOISE Reply #9 - 08/30/09 at 20:13:31 Thanks for all the ideas . Anybody know what burnt valves sound like ? I've taken it apart and nothing looks or feel loose or scared, I'm seating the valves while its down, the seats look black (notice no capital lettler.....ha! )
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Trippah

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Re: PISTON NOISE
Reply #10 - 08/30/09 at 21:12:38

Boule'tard..I never understood why people suggest running a premium gas..if by premium you mean higher octane. Unless MMRanch has modified the compression, regular swill is more than sufficient. He could drain the tank and add fresh gas but if the sound has been for the past several thousand miles, that's at least ten tankfuls so unless it's all from the same fuel storage tank, it can't be a culprit. By throttle related I suspect he is saying the sound becomes more frequent as RPM's increase, or gets louder. Might want to check valve clearance unless the sound is too low in frequency (Hertz) not of occurrance. Curious about nr of miles on the engine also. Oldfeller's suggestion on piston slap seems right. Let us know what you find.

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Phelonius

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Re: PISTON NOISE
Reply #11 - 08/31/09 at 10:19:13

MMRanch wrote on 08/30/09 at 20:13:31:

Thanks for all the ideas .

Anybody know what burnt valves sound like ?

I've taken it apart and nothing looks or feel loose or scared, I'm seating the valves while its down, the seats look black (notice no capital lettler.....ha! )

Do a compression test. That will expose burnt valves.

Phelonius

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Boule’tard

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Re: PISTON NOISE
Reply #12 - 08/31/09 at 11:04:00

Trippah wrote on 08/30/09 at 21:12:38:

Boule'tard..I never understood why people suggest running a premium gas..if by premium you mean higher octane. Unless MMRanch has modified the compression, regular swill is more than sufficient.

It is, and I've never gotten any noise running 87 octane gas. But I can't help but think the higher octane reduces spark-knock under high load/low RPMs even at the stock compression ratio.

Quote:

He could drain the tank and add fresh gas but if the sound has been for the past several thousand miles, that's at least ten tankfuls so unless it's all from the same fuel storage tank, it can't be a culprit.

It's possible he's got excessive carbon buildup (which aggravates knocking) that has just become evident in the last couple thousand miles. The other advantage to premium gas is that they typically mix in a higher concentration of detergents, additives, "Techron" or whatever, that clean out the deposits. A good dose of SeaFoam might also help.

Quote:

By throttle related I suspect he is saying the sound becomes more frequent as RPM's increase, or gets louder.

That could be the case. I was thinking the sound only occurs when he whacks the throttle open at too low an RPM, which would tend to induce spark-knock or piston slap. But yeah, if the noise increases with RPM (all other things being equal) it's time to bust out the tools.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: PISTON NOISE Reply #13 - 08/31/09 at 11:16:11 Ive seen guys drop rice down the carb on cars when they thought there was a carbon buildup issue. IDK if it helped, I was just about 12.
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Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12671 Fayetteville, NC Gender:	Re: PISTON NOISE Reply #14 - 08/31/09 at 16:34:09 .... and is that how Rice Krispies were invented? Snap, crackle, pop .... Rice Krispies !!
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