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View Full Version : 22 tooth front sproket on t140 5-speed



kheaton
07-18-2012, 9:17 AM
Has anybody done? If so, how the hell do you get in on? I was told to file the cases but wanted to check here first. I've pulled the trans apart to move the high gear back thinking it would allow room to slide the gear in between the case and trans but that didn't work either.

Ken

Torch
07-18-2012, 9:30 AM
you gotta watch the chain clearance issue, some chains will hit the engine with the 21 tooth gear. besides a 21 is usually enough of a difference in gearing to make it more of a freeway flyer, be careful about going too large on the trans gear it makes for a real doggy bike out of the hole.
if you have a T140D with the disk brake it might be easier to reduce the rear wheel sprocket size by 2 or 3 teeth.
one tooth on the trans gear is equal to 2.5 teeth on the rear sprocket.

redasphalt3
07-18-2012, 2:37 PM
pull your main shaft and you should be able to slide it right up there then push the main shaft back through... prolems going to be tightening it up

kheaton
07-18-2012, 8:34 PM
you gotta watch the chain clearance issue, some chains will hit the engine with the 21 tooth gear. besides a 21 is usually enough of a difference in gearing to make it more of a freeway flyer, be careful about going too large on the trans gear it makes for a real doggy bike out of the hole.
if you have a T140D with the disk brake it might be easier to reduce the rear wheel sprocket size by 2 or 3 teeth.
one tooth on the trans gear is equal to 2.5 teeth on the rear sprocket.

I looked at it again and you're right, 22 will be too big, and a 21 will be close. I put a 21 on a buddies bike and it worked great and went through the case with no problems. As for the rear, I have already went from 47 to 45 teeth and I'm having trouble finding a rear sprocket smaller than a 45 with four holes


pull your main shaft and you should be able to slide it right up there then push the main shaft back through... prolems going to be tightening it up

Tried that. I even unbolted the motor and lifted it up a bit. Still wouldn't go in from the bottom or the side.

Speedfiend
07-19-2012, 7:46 AM
Sprocket Specialists have or will make any sprocket you like. I picked up a 42 tooth sprocket for my project on Ebay. It had a Sprocket Specialists stamp on it so I looked them up. They look to be a pretty big outfit.

Torch
07-19-2012, 9:01 AM
I've used Sprocket specialist several times, fast and cheap, and a new custom sprocket runs about $45, send them your old one and they will send you both back.

kheaton
08-10-2012, 5:40 PM
I went with a 21 and got in on with minimal fuss. Fixed a few other things and put the primary back together last light. I didn't notice it before but when I pull in the clutch, the clutch basket moves quite a bit, is this normal? It's all together and everything is tight and adjusted per the manual. I'm being overly cautious because I just replaced the clutch basket before the ride to the Smokeout because the machined insert that the rollers ride against broke loose. I tore it apart as soon as I felt the vibration so there was no other damage.

I called Sprocket Specialist and they sell 4 hole rear sprockets as small as 40.

Ken