OzVMX Forum

Clubroom => Tech Talk => Topic started by: Sorelegs11 on July 29, 2013, 06:03:53 pm

Title: Mikuni - Kehin jets
Post by: Sorelegs11 on July 29, 2013, 06:03:53 pm

I know this one is a long shot but is there any comparison charts in regards to mikuni and kehin jet sizes.

 I have a kehin that runs good but not "legal" and would like to put a new mikuni on my yam 250 dirt tracker.
Ran the sizes listed in a haynes manual and fried thpiston /rings after 3 laps.

It would be interesting to see what the compatable jets where.

Cheers Darren

Title: Re: Mikuni - Kehin jets
Post by: GD66 on July 29, 2013, 06:20:57 pm

Some info here for Mikuni, mostly VM roundslides. You haven't said what sort your 250 Yamaha is (2T or 4T) or how old, but have a peek.

http://www.braigasen.com/Mikuni_jetting_chart_two_stroke.htm

For what it's worth, there is bugger-all difference in the hole size of the two makes of jet but of course the threads are different so they are not compatible.

Title: Re: Mikuni - Kehin jets
Post by: micks on July 30, 2013, 11:11:26 am

hope this can help http://huntertoolup.com.au/forum/viewtopic.php?f=10&t=82

Title: Re: Mikuni - Kehin jets
Post by: GD66 on July 30, 2013, 12:46:53 pm

Wow, good find !

And that's my theory shot fair in the ar5e ! ;D

Title: Re: Mikuni - Kehin jets
Post by: Sorelegs11 on July 31, 2013, 08:14:00 am

Good stuff
Thanks Darren  ;)