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Just got this idea from 59burst, I think some of us probably want to know the exact belt length of different Yokomo buggies so that our upcoming restoration projects can get a reference.

Maybe we can put a standard quotation for this; & anyone who knows the correct data can get some input in this thread.

I double-checked my own MX4, the front belt is 189T & rear is 44T, 3mm pitch; that is:

MX4 - S3M front 189T, rear 44T

94' YZ10 - S3M front 170T, rear 64T

I counted up some belts for the 870c and (I'm guessing) original YR4.

870c has 168 tooth front belt, 64 tooth rear belt. this is 504mm and 192mm respectively.

yr4 has 161 tooth front belt, 64 tooth rear belt. this is 483mm and 192mm respectively.