1983 CR 250

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8/16/2018 11:49 AM

I've tried to get the jetting on my stock carb figured out to no avail. It seems the changes I make have little to no effect. I'm going to buy a 38mm Mikuni flatside and give that a shot. Does anyone have ballpark jetting (slide) specs for that carb?

I'm a taller guy and feel like the bars are too close to me. I've looked for aftermarket top triple clamp with no luck. I did notice the 84 CR has removable mounts. Will that clamp fit? If so maybe I can find some offset mounts.

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1983 YZ 250K, 1983 CR 250, 1982 CT110, 1978 Maico 440

8/16/2018 12:50 PM

Don't fit a Mikuni!! They have absolutely no place on a Honda!! Go for a 38mm PWK airstriker. You will need a reed block spacer though.
We make billet clamp sets for the 43mm forks that move the bars up and forward.

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8/20/2018 10:30 AM

The stock 36 mm Keihin carby can work fine.
Stock: #160 main
Pilot: #75
OEM is jetted for sea level altitude and 20:1 pre-mix ratio.
I ride at 1000-3000 ft elevation (PHX and Tucson) and use 32:1 premix so the stock jetting needs to be leaned out.
I've tried leaner Pilots...#70....#65...#62...and right now, I've got a #60 in it with the mixture screw at 2 turns out for 3000ft altitude.
I tried a #158 main and I'm running a #155 main, now.
I have the stock needle dropped one clip position to lean the mid throttle position (clip raised one slot from the middle).
I'm no expert, but it seems to work fine.

Photo

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8/20/2018 10:41 AM

Madmax31 wrote:

I've tried to get the jetting on my stock carb figured out to no avail. It seems the changes I make have little to no effect. ...more

From what I have seen, the upper triple clamp on my '83 CR250 and '88 CR250 could be the same...they have hard mounted bars that are centered behind the steering stem...makes the bars feel low and close compared to a modern bike.
My '83 CR480 top triple is shaped the same, but has removeable, rubber isolated bar mounts. I think that's a CR 450/480/500 thing.
If you want it to feel more modern, get the bar spacers that were previously mentioned.

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