Originally Posted by losi_alaska

Hey all, I have been running the go's for 3 years now, this will be my 3rd year.
Chris Dewinter turned me on to them. I have several of the go's and last year I bought a couple of the 21 3 port race motor. I ran the B21 last year in my buggy and this year I am running the R21. What is the diff between the 2? The B21 kick but last year with a jp4 pipe and 30% bryons. So which pipe would be go for this R21 and is there any issue's with this R21. I don't see alot of talk about them, beside an o ring issue, any thing else???
Thanks in advance Jim