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Old 04-24-2014, 08:55 PM
Theon Theon is offline
Motorized Bicycle Elite Member
Join Date: Jan 2014
Location: FNQ Australia
Posts: 1,440
Default Re: Bought bottom end from Boy Go Fast, should I be worried?

Sorry Greg but rod length and stroke are not related.
You are more likely to get a short rod on a long stroke motor, but you can also get a long stroke and long rod.
As you can get short or long rod on 38mm stroke, the GT5 has short stroke and long rod so high wrist pin piston, however I had a 38mm stroke motor with a short rod before.
Infact I have had motors of all four configurations.
Long rod is 90mm, Short rod is 86mm I believe.
Hence the difference in wrist pin height.
I only have short stroke log rod and long stroke long rod cranks on the bench at the moment but they both take the same piston.
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