Hi everyone I have a question for anyone who may have had a similer problem.
Under acceleration from a dead stop my 1999 polaris 500 4wd scrambler has a loud banging sound comming from around or about the left side belt cover. It dose this in 4wd or 2wd. It dosnt do it just riding along moderatly at a constant pace, but wapp the throttle or get it on a load like a descent incline and bang, bang, bang. Any ideas??????
This is my first automatic and first Polaris I'm use to japaneese bikes with gears not clutches and belts.(Race models) Any related info would be helpful.
Also by looking at other threads I see that the more info I provide the better, so here it goes.


1. I replaced all the chains less then 6 months ago with DID xring chains the sprockets looked fine although I should have replaced them also.

2. The tires although not Stock brand (ITPs) are stock size.
I replaced both front cv joint boots when i replaced the chains.(the sounds not coming from there, both boots had just failed the joint was not damaged by grit)
3. I keep the bike maintained as far as fluids, grease, checking for bad axel, swingarm bearings, joints and tie rod ends ECT ECT ECT.
I'm a competent mechanic, just never realy delt with this bread of machine so any info I can find before i tear into this thing would be greatly appriciated.

I wanted a 4wd and this bike was cheap I got it for $900.00 not running. I found through testing that it needed a CDI box (ebay for $5.00 and 6 months looking)(why dont they ever have specks for cdi boxes) and a flywheel thats magnets had desinigrated and someone tried to epoxy back together ($219.00 new got tired of waiting to ride)scary thing is it worked. LOL, Shade Tree machanic strikes again. any way if ya have any info for me I'm all ears.

 

Check your sprockets to make sure the teeth are ok but it's most likely the chain inside the trans has stretched/worn and is jumping the sprocket teeth under load.

 

Maybe a flat spot in the belt if it is coming from the left side. The belt cover is easy enough to take off. I would start looking in there. You can start and ride the scrammy with the cover off and see what it does. Be careful not to get your clothing or worse into the clutch when its running. Look inside the cover for any rubbed spots where the clutch may have made contact with the cover. Welcome to the forums.

Steve Lubecki

 

Ok Thanks for the info.
Business debts and Gas prices have forced me to sell This bike it gona be listed in the classifides if your interested $2200.00 O.B.O. with the problems. it also could use a new battery.
Thanks again everyone.
Gary

 

Well for some reason i cant log in at the classified section So here it goes. its a 1999 polaris scrambler 4wd that has the above mentioned problems. Its $2200.00 OBO and could probably use a new Battery other then the banging it has no problems. The clutch side case was warped by some type of heat before i got it. It has a custom FMF sticker Kit and seat cover (slightly sun faded) and the I.T.P. mudlites have less then 5 miles on them. If ya want pics email me at wrench211@yahoo.com. Im in Cumberland Md 21502 The bike is red.
If putting this here was in some kind of violation with the sight I'm sorry. I honestly couldnt log in when it prompted me to
$2200 is the low book price and leaves the buyer some room to get the parts he or she needs
Thanks for looking,
Gary

 

Hi,
I know that you mentioned changing the inner cv boots. Is it possible that you put it back together with the cage in backwards? I'm not doubting you or possibly your mechanics mechanical skill. However, this is quite common. The cage has one side that has a larger opening than the other. You want the narrow side facing toward the outer cv joint. The easiest way to be sure during the installation is to put the boot on the shaft. Then place the cage on the shaft. Now attach the race to the shaft and pull the cage up onto the race and twist it into position and install the *****. If you put the race on the shaft first then the cage is definitely on backwards. This will cause the ***** to ride in the wrong position on the race and cause noise or breakage. Just a thought, If you need any further assistance PM me.
Danny
"thecvman"