rubberneck Posted July 6, 2008 Report Share Posted July 6, 2008 Ok, spent 7 days at the dunes last week with both shees and had to replace the rear sprockets on both bikes every 3 days.(about 20 gallons of fuel to give you an idea) WTF is going on. They would be fine for about a day, then start showing some wear day 2 and then by the end of day 3, the teeth were worn to the point that the chain was skipping and popping like mad at even moderate throttle. The teeth were shaped like a sharks fin. (will get pics later) Now if it was just one bike i would say something is bent or out of alignment, but both bikes did it in about the same amount of riding. I have experienced the sand in the chain/popping thing before because i dont have a skid on my bike. This is nuts though. Here is the background. My bike 421 cub, roundhouse style carrier, new everything and I mean everything on the bike. Everything is tight and solid, and i verified that the sprocket alignment is spot on by clamping steel straight edges to the sprockets. I run no swinarm skid plate on the bike. I am running an RK x-ring chain that I got from Cascade, and a renthal front sprocket My brothers bike: Basically a stock bolt on bike. t5's timing+4, K&N etc etc. His bike we do run a swingarms skid plate on. Alignment also verified between front and rear sprockets. This bike had Direct drive chain and front sprocket on it. So my question is this. Could they just have been cheap sprockets?? The first ones to go on each bike were direct drive units from rocky mountain. The second set to wear out were JT units that I found at a local shop in Oregon. Will switching to a name brand unit fix this. What brand? Renthal, sprocket specialties, What?? Im confident there is nothing wrong with either of the bikes. Everything is aligned and the chains were adjusted to spec and checked daily. Im stumped. Ive never had bikes tear up sprockets like this. Oh yeah, the front sprockets on each bike were never touched and still look like new after about 40 gallons of fuel through each bike. Quote Link to comment Share on other sites More sharing options...
Toybreaker Posted July 6, 2008 Report Share Posted July 6, 2008 (edited) Aluminum or steel sprockets? Edited July 6, 2008 by Toybreaker Quote Link to comment Share on other sites More sharing options...
rubberneck Posted July 6, 2008 Author Report Share Posted July 6, 2008 Aluminum or steel sprockets? Whoops, sorry, that would be a vital bit of info woudn't it. They were all steel Quote Link to comment Share on other sites More sharing options...
jamebo Posted July 6, 2008 Report Share Posted July 6, 2008 That is kind of odd that the back ones are wearing out with no wear on the fronts. Usually a worn sprocket indicates a worn chain. I normally replace all three at once as a new matching set. But that doesn't explain why one of yours is wearing and not the other. Maybe you could try a stock Yamaha rear sprocket, they hold up pretty well. Quote Link to comment Share on other sites More sharing options...
rubberneck Posted July 6, 2008 Author Report Share Posted July 6, 2008 That is kind of odd that the back ones are wearing out with no wear on the fronts. Usually a worn sprocket indicates a worn chain. I normally replace all three at once as a new matching set. But that doesn't explain why one of yours is wearing and not the other. Maybe you could try a stock Yamaha rear sprocket, they hold up pretty well. Yeah, i hear you, i used to replace in sets too, but no way in hell i was going to replace a 100 dollar chain that had 6 days of riding on it and looked perfect. Front sprocket looks new too. Im baffled. Like i said, if it was 1 bike doing it I would be thinking something is wack with the bike, but both bikes, and 1 is about 1/2 the horsepower of the other. Quote Link to comment Share on other sites More sharing options...
brugal Posted July 6, 2008 Report Share Posted July 6, 2008 R.M.A.T.V."s Primary drive sprockets are all I use with no probs ever.One side of the sprocket is stamped with the number of teeth on the sprocket.Did you install the sprocket with the stamped side facing out? Quote Link to comment Share on other sites More sharing options...
dajogejr Posted July 6, 2008 Report Share Posted July 6, 2008 If it were one sprocket, I'd blame it. Do you have the factory garbage Yamaha swingarm/carrier assembly? It's out of alignment, either way. And you keep trashing rear sprockets, that hundred dollar chain won't be worth a dollar. Check the alignment, check the rear carrier bearings, and are you over tightening it by chance? I run aluminum sprocket specialist on the rear of my 10 mil drag bike. The 44 tooth I used all last year shows no wear, don't let people tell you aluminum sprockets are garbage, they're not. Quote Link to comment Share on other sites More sharing options...
KaosBanshee44 Posted July 6, 2008 Report Share Posted July 6, 2008 If it were one sprocket, I'd blame it. Do you have the factory garbage Yamaha swingarm/carrier assembly? It's out of alignment, either way. And you keep trashing rear sprockets, that hundred dollar chain won't be worth a dollar. Check the alignment, check the rear carrier bearings, and are you over tightening it by chance? I run aluminum sprocket specialist on the rear of my 10 mil drag bike. The 44 tooth I used all last year shows no wear, don't let people tell you aluminum sprockets are garbage, they're not. didn't you tell me to run steel on my 10mill? Quote Link to comment Share on other sites More sharing options...
2strokespirit Posted July 6, 2008 Report Share Posted July 6, 2008 Get primary drive sprockets, if I understand correct, both has the same sprockets on?? I would say its the sprockets, but it doesn't make sense.. even the cheapest sprockets will last longer than a weak with almost no wear, unless they were made of plastic. The fact is, even if the alignment were off, it would have last longer... Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted July 6, 2008 Report Share Posted July 6, 2008 primary drive baby!!! ive always run them. ive had them on 4mm stock cylinder, 4mm cub and now my 10mm cub and never had an issue.. they are cheap and readily available. i keep all sizes on hand for the rear in case i decide i wanna do some gearing changes. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted July 6, 2008 Report Share Posted July 6, 2008 didn't you tell me to run steel on my 10mill? Yep...sure did. You have a Yamaha rear sprocket hub, I have a Honda. I'd run steel if it's available... However, My point was don't blame the aluminum in this instance if he was running it. People give it a bad name..I'll post up a pic of my rear 44 tooth with a few hundred passes on it. It still looks new. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted July 6, 2008 Report Share Posted July 6, 2008 I kinda disagree with you Dave, I know for a fact that my alignment was good and I ripped up a few aluminum sprockets. I have pulled single teeth right off and bent the tips of others all i the name of duning Quote Link to comment Share on other sites More sharing options...
dajogejr Posted July 6, 2008 Report Share Posted July 6, 2008 Ok...I should add...like anything else. Some are made better than others. these are 50 to 65 each, made by Sprocket Specialist...who, will make a sprocket for anything you want. Need a 90 tooth sprocket for a sled motor quad...got it. This is my 44 tooth that I took off and went with a 45 tooth... This sprocket probably has 200 to 300 passes on it, easy...I cleaned the grease off it, but that's it. Quote Link to comment Share on other sites More sharing options...
BellicoseBanshee Posted July 7, 2008 Report Share Posted July 7, 2008 I used an aluminum rear sprocket once, it was great, just wore much faster in the sand. Had no issues with the teeth breaking though... Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted July 7, 2008 Report Share Posted July 7, 2008 who cars about the sprocket, Whats up with them peanuts dave?!?!? Quote Link to comment Share on other sites More sharing options...
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