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Message started by nickbilljim on 08/02/20 at 07:55:36

Title: main jet for V M 38
Post by nickbilljim on 08/02/20 at 07:55:36

I have an 1986 savage with D R cam,sponge air filter mounted direct to carb, exhaust port opened to 1.5 1nches and one of Lancers high comp pistons.

I have just fitted a V M 38mm carb on and put in size 20 pilot jet and 185 main,it pulls well thru low and mid range but I am not to sure about W O T,I went for a test run hit 80 M P H in third but struggled to hit 90 in 4th,am I expecting to much or would a bigger or smaller main
jet increase top end.I have read here that some people run a 210 main jet but I have also read that my high lift cam could mean smaller main jet. Forgot to mention I have a Voodoo exhaust with minimal baffles

any help would be appreciated

Thanks Nick

Title: Re: main jet for V M 38
Post by LANCER on 08/02/20 at 11:33:12

Bump you main to 200 and see how it responds.

Your voodoo exhaust, how minimal are the baffles ?

Title: Re: main jet for V M 38
Post by DragBikeMike on 08/02/20 at 12:02:30

I agree. Your main jet is too small. If you keep trying to set the land speed record (LSR) you will hurt it. Go up to the 200. See how it runs in 1st thru 3rd. Then go to a 220. Power should go flat (too rich) with the 220. Then you will know a 200 or 210 will be about right. Discontinue the LSR attempts until you know you have a main jet large enough to prevent damage.

Title: Re: main jet for V M 38
Post by nickbilljim on 08/02/20 at 23:22:07

thanks for the feed back my exhaust is a slash cut that came with the bike so I dont know whats in it, it is very loud,I would say with minimal or no back pressure .
I am ordering new jets today,starting at 200,thanks again for your help Nick