Need some urgent tech support !!!!!

O

OB_speedster

Registered
This is supposed to be for the attention of Dirty Pete , or anyone else on the boards with sound technical knowledge of the busa. I got the `99 copper/silver , 10 000 miles and the cam chain tensioner recall has been done. After about three minutes running from cold engine a funny vibration noise ( Almost like a rattle of some loose part ) can be heard just on 1600 - 1700 revs. Below and above that absolutely nothing. It goes away again after a while , but surely does sounds funny. If it was indeed a rattling part of the bike , you should have heard from cold to warm all the time. C`mon guys , what could it be , must I be concerned ??
 
Could just be valve train noises due to extra clearances until engine gets warm. But DP knows more than me. Whatcha think DP?
 
Thanks bk , I also had that in mind , but it`s not a tik tik tik kind of sound , rather like a moving part knocking or running against an engine cover , or something like that. Really difficult to explain , tecnical guy at local dealer says he has no idea at all , but he is sure it`s not the timing chain ( my original thought )
 
No just a slower memory. If you say it's 15k then it's 15k. But could this be part of speedster's problem?
 
Hmmm....I have the exact noise on My motor!

And you know what???

I'm running 100% synthetic oil? It's Mobil 1 but that doesn't matter.

Keep in mind that My motors built, has a billit basket lockup clutch, and a bunch of head work.

I thought it sounded like the timing chain was rubbing the valve cover, but there is NO chance of that cause there is a guard above the chain.

It sounds like a loose chain rubbing somewhere through the block?

I also have a APE cam chain tensioner, and thought maybe that was the cause.(not!)

I even went as far as to pull my throttle bodies off, valve cover and investigate.

Chain was tight, and NOTHING look out of place.

Sometimes I kinda think it sounds like a worn out lifter on a 350 chevy?

It only happens in that same rpm range. It doesn't matter if your going up or coming down in the R's?

I'm not done, I'll work on this one until I get a answer!

Good luck with yours....let Me know if you ever come up with anything?
 
That is why I asked if you lean the bike to the other side if sound is still there.
Possible camshaft end play eventhough the shaft runs in a slot
 
Speedster I don't know why you'd pick me out to ask; I have much less mechanical knowledge than many on the board.

Bus ta Kaw has a good point. Given that the noise only happens in a narrow rev range and in a certain heat range during the warm up, it could be valve clearances and/or a top end oiling problem. Are you running a 0W50 or some other oil with low cold viscosity? If so I'd go back to 10W40 and see if that helps.

First thing to do is determine where the noise is coming from. If someone can hold the throttle for you, good. Use a 12" X 1/2" aluminum rod pressed to your ear as a stethoscope. A long screwdriver with a hard handle will do in a pinch. Just touch the end to various engine locations...you'll know when you're on top of the problem area.

Your best suspects are probably a slapping cam chain or the clutch.

Does it only make this noise on the sidestand? Does it go away when you hold the bike upright? If so my guess is that it's the clutch making noises when it's out of the oil bath and cold.

I don't know what your level of wrenching skill is, but unless you're able to make the repair/adjustment yourself, there's little point in diagnosing the problem at home. In that case, you're always best to let a pro wrench like Johnnycheese hear the problem himself and methodically find a solution.

Good luck!
 
Needless to say, you want to run around the engine compartment with wrenches and screwdrivers to make sure it's not some exterior fastener that's vibrates sympathetically when cold but then tightens up just enough as the engine warms. Check every screw and bolt you can reach, including radiator mountings.
 
D P
Thanks for response ! I use 10w40 Castrol 100% synthetic for last 2000 miles. As I said , the noise starts after about 3 - 4 minutes of running from cold , keeps on for about 5 - 8 minutes. It does go away if you give it some stick once the engine is warmed up. From the sound of it I think you got a good point with slapping cam chain. If so , what`s to do about it ? Top end oil starvation ? Why is it gone when cold ? I will investigate and report back.
 
P S

It does not seem to be the clutch , makes the noise whether on the stand or not , clutch engaged or not , don`t know , does not ad up to the clutch for me , what do you think ?
 
Check your balancer adjustment bolt. This can be adjusted in either direction. After adjusting as per instrucions. Start engine and see if noise is gone.
 
How about if you lean the bike to the other side?
Have the dealer use what DP said a screwdriver works as well or a stehascope
(should had my Mother-in-law write that word)
You are not local but after the dealer listens agian have them put a call into Suzuki and just let the dealer make Suzuki make a record of it.
 
Thanks Johnnycheese.I think I will run the bike like this , it does not sound too serious to me , but I would like to discover the source of the problem. From what you have read so far , what would be your thoughts on it , any ideas about possible engine damage ???
 
I would still get it to a dealer and make sure Suzuki has a record of the sound,Even if you have to leave it over night so they can hear it.and get a copy of the shop stating there was a sound and they had informed Suzuki.
This is what is called CYA
 
Right JC. But Speedster, be prepared to leave the bike there on the spot. The dealer may say (make that probably WILL say) that if you ride the bike anymore knowing there's an undiagnosed problem, your warranty will be voided as far as that problem is concerned.
 
Have you done the valve-cam clearance maintenance yet? If I remember my owners manual correctly it needs to be done around 10k miles. Just an idea.
 
Frank , thanks for the detailed info. It is exactly the way mine sounds , and yes . you`re right you can go up or down the rev range , if you cross that point you`re sure to hear it. I removed the covers yesterday , and did the noise detection test as prescribed on the boards. The sound eminates from the top right hand side of the engine ( as you sit on it )but reading your reply I gather that it`s in fact not the cam chain ? I will take it to the dealer for recording the problem , and then I`m going to ride it , cause in our part of the world we got two problems (a) lack of decent tecnically skilled wrenchers and (b) a hell of a waiting period for parts , if needed. What do you think , is it dangerous ?? are you running yours with the problem or not ??
 
It's diffently not from a loose cam chain.

I rode My bike around about 50 miles to see if it got any worse, and it didn't.

This noise has to be coming from the valve train? The sound is right at the valve cover area.

Right now My engine builder is in the process of putting a different head combonation(I'm changing the head) and something may show up in the next few days?

Jay at American Performance Engineering(APE) just finished doing some R&D with another well known E-builder on some real sweet valve springs for high lift cams, and I'm waiting to use them on My new head setup.

With these new valve springs, there will be no chance for coil bind, and the seat pressure will be between 48 to 50pds. Much more than that could cause big problems.

So if there is something serious to be found, I'm sure it will show up??
 
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