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about to change sprockets and chain about to change sprockets and chain
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 13 Jul 2009
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Found a 577 14tooth at a local store,hope its not a big diff from the 15tooth, i wasnt able to follow the speed limit in 5th gear anyway so i guess its good.. maybe have to remove a link from the chain maybe?
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Old 13 Jul 2009
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my new sprocket was thinner as well
With my new front sprocket I ordered( which is thinner than the original) came a splined spacer to make up for the lack of width.
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Old 13 Jul 2009
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Wouldn't it be stronger if that spacer was actually welded on to the sprocket?

Vando
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Old 13 Jul 2009
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the fact it has a spacer and not a solid build up theroreticaly makes no differance. The sprocket is held tight to the spacer and shaft axialy along the drive shaft and in the correct radial loading position in line with the rear sprocket.

there a 2 main reasons the sprockets are tight, firstly is to ensure it doesn't fall off, and secondly to prevent any non radial forces causing damage to the splines (A wobbly sprocket will cause premature wear to all conecting parts, including internals.) this then ensures that most of the torque is directly transfered to the rear sprocket.

If this problem is stopping you from traveling, i don't see a problem with getting a local machine shop to knock up a space to sit behind the sprocket, it doesnt need to be splined as basicaly its only for positioning purposes.

feel free to pull me apart on this, but i've overcome similar problems to this the same way on a lot larger machines (500MW steam turbines)

Paul
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Old 13 Jul 2009
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It worked on my 3hp moped 8 years ago
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Old 13 Jul 2009
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Ill report on the 14teeth soon.
I now have cleaned the area around the front sprocket,rear frame, the rubber thing that the chain glides on and the 2 chain rollers. (they were all very dirty by some kind of living oil-entity,it was tough to get clean )

Now ive put the front sprocket on and the nut loosely, now the only thing remaining almost is the chain.. Well i have the chain and the rivet link and the jumbo tool, but wheres the instructions for the jumbo tool that im sure i had outside 2 days ago hmm

I have the general idea of how to use the jumbo riveting but im not sure how its supposed to look in the end, its a hollow type link i think, is the idea that these get pushed outward by the jumbo tools plate and then the chain plate cant get loose? Anyone have the instructions for the jumbo tool in pdf?
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Old 13 Jul 2009
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Found the instructions but I think its very confusing. I dont have the instruction for the chain, how many millimeters to put the plate in on the end of the link etc.. then how do i know if ive pressed the pins out enough?
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Old 14 Jul 2009
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Quote:
Originally Posted by bacardi23 View Post
Wouldn't it be stronger if that spacer was actually welded on to the sprocket?

Vando

maybe ? Just glad bikebandit sent it or I would've been very confused. So far no issues.
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Old 14 Jul 2009
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It would be stronger because it would deliver the power on a bigger surface area thus reducing the amount of torque applied on the total area of the sprocket/axle
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Old 14 Jul 2009
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Sprocket and chain project is now finished with good results

No more humping from the bad chain and instead a much more silent sound, sounds sweet as a humming bird flying along..

Going for a bit longer ride now to test Ill report on the cruise speed/feeling later when ive tested.
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Old 14 Jul 2009
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Not sure how to describe this but, feels like less acceleration capacity for 0-80 but reacts faster and better for slow riding in the dirt or woods.

I would have used the 15teeth if I had one,but only because I like to cruise. Noticed the difference on 5th gear when cruising at 80 KM/H and at 90 where I like to stay often the rpm was 4500 i think which is too high. With the old 15T I remember just under 4000rpm was 90KM, and now 3900rpm is 80.

So my verdict is, 14t is good but i dont like the rpm when cruising at 90-100, I like to use the torque on low rpm that this engine has

Btw got an email from wemoto they admitted they sent the wrong type - 1577 instead of 577, they ordered it from theyr dealer and are sending me the 15Twhen they get it with a return slip for the other one so i can send it back.
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Old 13 Jul 2009
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Quote:
Originally Posted by bergspre View Post
Found a 577 14tooth at a local store,hope its not a big diff from the 15tooth, i wasnt able to follow the speed limit in 5th gear anyway so i guess its good.. maybe have to remove a link from the chain maybe?

Bergspre, please be kind enough to inform how you like the new 14T sprocket when you have tried it. If the chain rubs heavily on the swing-arm protectors exc…



I am not a fan of the standard gearing, for me it is too high even on-road (4th to low 5th to high normal cruising speed). Lower gearing would obviously be a lot better off-road.


A 4-6T bigger rear sprocket will not fit with the standard chain slide in place. I have adapted the rear wheel from my KTM to fit my TT600RE and had to get a smaller rear spocket (48T) before it would fit.
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