So i just got done doing berings in my 929 motor! new rod bearings and crank bearings! I got it all together last night put the motor in the bike and got everything together and started it! it fired right up, no smoke, nothing besides this loud whinning noise! sounds like coming from the top of the motor but not sure! i let the motor run for 30 min at idle, and took it around the block and there is still that whinning noise! I think it might be either the timming chain or maybe clutch! If anyone has ran into this problem and know what it is let me know, thanks alot

 

how'd you got about setting chain tension? as well, ya might wanna go thru the clearance between the teeth of the crank and clutch..

lots of things can make that noise.. you can kinda narrow it down with a mechanic's stethoscope. if you don't have one or can get one, use a long screwdriver.. make a fist around the handle, then kinda cup your ear to your hand with the handle almost touching your ear, and lightly press the metal end of the screwdriver on the case around where you think the noise is coming from. when done right, this is the ghetto stethoscope i've come to know and love over my 6 years of building and fixing bikes.

it does it evidently in idle, so it's definitely not a trans issue..

 

Well when i put the tensioner in i did by the book. Turn it all the way in bolt the tensioner and then take the screwdriver out and let it set itself! and i have another clutch assembly and that makes sense about the gears to close! but when i put the pipe to the side of the timming chain side it sounds like it is comin from there! can a timming chain tensioner that is spring driven actually put to much pressure on the chain? I have an extra tensioner i could use....

 

is it the original cam chain tensioner that you are using right now?
how old is it?

 

an auto chain tensioner doesn't normally put TOO much on a chain. often, it's not quite enough.
now, i'm in the habit of when i do head work, i will rock the cams and take up the slack with a wrench on the crank.. just kinda rock it back and forth a few times with maybe no more than 90* of crank rotation..that'll give you 45* of cam rotation, which is more than enough to shock and load the chain and seat the guilds and work the tensioner out.

was everything plastigaged out even with the new bearings? theres always a very slight possiblity that something shifted or isn't quite where it should be and something is rubbing or is misaligned.

its kinda hard to diagnose without seeing or hearing anything..lol

ya.. with "scoping" out the noise (with your ghetto stethoscope) it'll be REAL loud (obviously) when you're right at the source og the noise.

keep in mind tho.. the sound can transfer and sound as loud on the opposite side depending on the case webbing and a bunch of other factors.. it's more of a rough guess tool than anything.. sometimes you can pinpoint a problem with this method tho.. but like i said.. be wary of sound transmission to a false locale.

i can't really think about too much that would bake that noise.. and i have yet to tear a 929 apart.. JUST had one in the shop for a new clutch hub and cover, but thats all the further i tore into it.. if it's got a balancer thats out of timing, that can possibly make that noise.. they're usually gear driven and if they're not timed to the crank correctly, they'll hine and make stupid *** noises.

Hmm.. dunno man.. i'm shootin in the dark

 

yes all the bearings where to spec! all i really need was a rod bearing but since i was so far into it i decided to do all bearings and main bearing just in case! and i had all the dowels in the case and the head so everything should be lined up correctly! this is my first rebuild on a motorcycle motor! The problem cant be to serious cuz i have been letting it run and riding it around abit and this whine noise is the only god damn problem i have! And with the balancer it has springs on it and it can only shift so far each way so i dunno if that can be it! i will look into it and see if im a tooth off or something! Im almost tempted to just ride the bitch until something breaks and i know what it is but i dont wanna mess up a 300.00 rebuild! thanks for all your help man, your givin me some good ideas that might make a soulution to my problem! Im gonna get back to workin on it and ill let u know if i find anything out! thanks bro

 

so i find out what my problem was! I bought a new head gasket from cyclepartsnation.com and i put it on put the head on and torque the bolts to spec and everything! and i would of never guessed a whine and a little tick can be caused of a head gasket! i drain my oil today and there was water in the oil! So either this ******* sold me a warp head or i just bought a cheap head gasket. and the weird thing was the engine wasnt even somking white when i rode it or at idle! Kinda pist! but thanks for the help

 

right on.. at least A. you caught it before it got REAL bad and B. you know exactly what it is.

if it's justa light warp, you can lap it and get the bow out, or, take it to a machine shop and have them take off .010 or whatever it takes to get it flat.

that'll bump compression a tiny bit too.. give ya more power!! haha.. just make sure your piston-to-valve clearance is good enough to withstand a milling.. it should be.. i don't know of any stock motors that run THAT damn tight. squish is usually about .0450" or so, so you should be ok.

 

Ya for sure man! im kinda scared off millin the head, i dont wanna lean into more problems! Im gonna try and get the head re serficed or just buy a new head! And im glad i found the problem cuz with new bearings and water isnt good! thanks for the help man! Is there any chance the block could be warp? Cuz when i rode it today it had some ***** in 1st gear just givin it throttle it would spin all the way throu until 2nd! If its just the head i will be happy! But im pist that i bought a new head gasket and got like 2 hours of runnin time on it now i have to buy another one! ****!

 

theres always a possibility of somethng more being tweaked. i've seen where just bores aren't straight, and i've seen trashed heads and everything else is good. depends on the kind of abuse and how long it went on, and assembly procedures if it was a fresh build.

you know how to measure for warp? uber easy and simple tools..

 

ya i have a straight edge and filler gauges! and a mic! im plannin on takin the head off tommrw and checkin it out

 

well, sounds like you got it man.. good luck on that.. should be salvageable hopefully.. doesn't take much for them to leak. overtorqueing and gasket creep (especially on a lapped head) will cause that **** too.