Ninedriver
New member
Hello all
Still working on my Manco 710 and received some parts I ordered. One of which was a new belt. The kart is bone stock with the original subaru 10hp engine and comet 40 series torque converter. The belt I received is a replacement for the original 12346/203785 and according to the manual that should be correct. However, when I went to try and install it, it appears to be way too tight. Nearly impossible to get on and the wheels won’t rotate freely without the belt engaging.
After doing some research I read about sizing a belt correctly by measuring from the center of the jackshaft to the center of the crank shaft. I actually pulled out the engine so I could get a very accurate measurement and I came up with 8 3/4”. There is zero adjustability as the jackshaft mounting plate is bolted directly to the engine.
When I look at the comet belt tables, it shows the 203785 belt is for
8-3/16” C.D. The next size belt, 203786, is for a 8-5/8” C.D. Then the next size after that is for a 9” C.D.
I double checked and it is a comet 40 series with a 7-1/2” driven clutch.
Am I missing something? Is there any reason the manual would call for a smaller belt? And what size belt should I go with?
Still working on my Manco 710 and received some parts I ordered. One of which was a new belt. The kart is bone stock with the original subaru 10hp engine and comet 40 series torque converter. The belt I received is a replacement for the original 12346/203785 and according to the manual that should be correct. However, when I went to try and install it, it appears to be way too tight. Nearly impossible to get on and the wheels won’t rotate freely without the belt engaging.
After doing some research I read about sizing a belt correctly by measuring from the center of the jackshaft to the center of the crank shaft. I actually pulled out the engine so I could get a very accurate measurement and I came up with 8 3/4”. There is zero adjustability as the jackshaft mounting plate is bolted directly to the engine.
When I look at the comet belt tables, it shows the 203785 belt is for
8-3/16” C.D. The next size belt, 203786, is for a 8-5/8” C.D. Then the next size after that is for a 9” C.D.
I double checked and it is a comet 40 series with a 7-1/2” driven clutch.
Am I missing something? Is there any reason the manual would call for a smaller belt? And what size belt should I go with?