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My advice, if you haven't done so already, would be to invest in suspension upgrades, you will be able to attack the track much harder a 1mm bigger carb will not make you any faster. Bore the stock 38 and try it, have someone log lap times.
I have already got gold valves in both ends and been tweeking front and back to my taste.
Normally I wouldn't go bigger than the 38 on a 250,,,but I have had amazing results going from 32 VM round slide on my 1980 YZ125 to a 35mm PWK. I gained not onlyon top but off idle all the way up.
I know micro sprints using 250s often go 39-41 with PWKs so I was thinking I maybe able to gain on top more with the PWK.
Brian
I've thought about going a similar route on my '82 RM250. It's kind of exciting that as much as a top-end stormer the bike already is, going to a different carb (perhaps slightly larger) would give it even MORE top-end.
Have y'all looked at taper-boring the carb instead? Wouldn't that increase the Venturi effect, kind of a best of both worlds? I recall this was a popular mod on SCR bikes in the early '90s.
I'm sure excited to see the results of this project. I've wanted to mount a PWK to my '82 250Z to see how it would work .. But have never gotten around to it! Maybe this winter.
Most of the 40s I see, do not have the air striker fins,,which is I think a important feature for MX with the on/ off nature.
I'll give this 38 a try,,,then decide if I'll want more. The worst is I'll have a extra carb for another bike.
I'm wondering if the Dicks Racing mod of a power jet in the venture with dial is worthwhile? I've had 1-2 old mikunis with this that I never got to play with. Any experience on this?
Last weekend I raced the RM and stayed with a heavily modified 86 YZ490 to the first corner(4th gear),,,I thin pivoted under him and stole the holeshot award at the first jump at corners exit. The 83 RM250/with 82 head and DG pipe/vforce has sum spunk. I find 1-2 more bike lengths of power on the starts and she'll be a missile.
The Shop
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