OzVMX Forum

Marque Remarks => Yamaha => Topic started by: Scuberdiver on November 11, 2015, 09:49:01 pm

Title: 86 tt250
Post by: Scuberdiver on November 11, 2015, 09:49:01 pm

Looking for info on this as i just picked up a 86 tt250 Are the  tt250 and 350 the same in motor specs can I put a 350 barrel and head piston on my 250 and make it a 350 can any tell me what needs doing or has someone done this mod any information on this would be great thank jeff

Title: Re: 86 tt250
Post by: Nathan S on November 12, 2015, 10:20:43 am

No.

350 cases have a larger hole for the barrel.
350 crank is balanced differently.
There's apparently also some differences in the oil feed journal to the top end.

350 also has a steel or brass gear on the oil pump, rather than the prone-to-melting nylon of the 250.

Title: Re: 86 tt250
Post by: Scuberdiver on November 12, 2015, 09:40:25 pm

Thanks Nathan that all I needed to hear will keep the old girl  for now