Author Topic: Ballpark start, VM36 on 250 piston-port engine?  (Read 297 times)

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Offline John Orchard

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Ballpark start, VM36 on 250 piston-port engine?
« on: December 30, 2018, 09:00:07 PM »
Hey Guy's,

I was wondering if anyone could give a ballpark starting point for jetting on piston-port 250 running a VM36?

l have it on a Yam DT1 with ported barrel & expansion chamber. The carb that came with the bike has the follwing jetting......

MJ - 330
PJ - 30
N - 6DP1
NJ - Not out yet :-)
S - 2.5

Any help is appreciated, thanks in advance.
Johnny O - Tahition_Red factory rider.

Offline 211

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Re: Ballpark start, VM36 on 250 piston-port engine?
« Reply #1 on: December 31, 2018, 10:11:56 AM »
have 3 250 piston port bikes - '74-76 all run
main 290 - 310
pj45
1.5 on slide

Offline John Orchard

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Re: Ballpark start, VM36 on 250 piston-port engine?
« Reply #2 on: December 31, 2018, 06:30:09 PM »
have 3 250 piston port bikes - '74-76 all run
main 290 - 310
pj45
1.5 on slide


Wow l didn't even know you could get a 1.5 slide!!!  :-)  What needles Dave?
Johnny O - Tahition_Red factory rider.

Offline facthunt

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Re: Ballpark start, VM36 on 250 piston-port engine?
« Reply #3 on: January 01, 2019, 08:45:59 AM »
DT1 VM36

M 350
PJ 45
Q8
6DP17
2.5 Slide

Offline John Orchard

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Re: Ballpark start, VM36 on 250 piston-port engine?
« Reply #4 on: January 01, 2019, 10:24:51 AM »
DT1 VM36

M 350
PJ 45
Q8
6DP17
2.5 Slide


Thanks Fatty ;-)  What engine was that used on?
Johnny O - Tahition_Red factory rider.

Offline facthunt

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Re: Ballpark start, VM36 on 250 piston-port engine?
« Reply #5 on: January 01, 2019, 10:35:14 AM »
DT1 VM36

M 350
PJ 45
Q8
6DP17
2.5 Slide


Thanks Fatty ;-)  What engine was that used on?
Pre 70 DT1