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crf250 · Mar 17, 2013, 10:10 AM

Replacing 18.5 Intek with new 21 Intel.mounting holes on new motor are not threaded, is there a reason.

Stratmando · Mar 17, 2013, 10:22 AM

I would say 1) they forgot to thread the holes, 2) it allow threading for whatever thread you choose? or 3, throughbolting?

crf250 · Mar 17, 2013, 10:29 AM

Originally Posted by Stratmando

I would say 1) they forgot to thread the holes, 2) it allow threading for whatever thread you choose?, or 3, throughbolting?

those were my thoughts,thanks for the second opinion. I will probably tap them to use the original bolts

crigby · Mar 20, 2013, 08:05 PM

Hi,
No they are not threaded. The bolts are made to cut their own. If you look at the bolts from end-on, you should notice that they are slightly triangular and tapered at the end that starts them. Ah the miracles of high-speed manufacture.
An air impact tool will zap them right in, or you can tap them yourself which will allow you the thread the bolts with your fingers.
Peace,
Clarke