Recommended jetting for RD250A y-boot Uni air filter?

[justthisguy]

The boots from my stock airbox slipped off my carbs, and it's been a PITA to get them back on--they'll just barely cover the intakes, and slip off with a light nudge. Figured I'll just the cut the knot and replace the airbox entirely with the Economy Y-boot filter kit with the Uni filter, but I'm guessing the carbs will need to be upjetted? Wondering what range I should be playing with.

Specs: 1973 RD250, completely stock, sea level. This bike is a daily rider and I'm not trying to wring every bit of performance out of it, so I don't mind if it's running a touch richer than optimal. Thanks all!

[quocle603]

What is the jet spec for a stock RD250A?

[m in sc]

just use the y boot on the stock box..? then no need to rejet

[quocle603]

Try revive your yboot with alcohol and wintergreen solution. A lot of people have had good results with it

[pdxjim]

just use the y boot on the stock box..? then no need to rejet

Look at the brain on this ^ guy! 

... and for basic around town riding with stock pipes, the airbox offers the best performance.

[2t Fan]

From my experience I feel that EC Y boot mechanism need a support clamping to the chassis. Or over a period from swinging the foam filter can crack and separate from the housing

[justthisguy]

Thank ye.

I put in the order last night, figuring I can use y'alls advice on trying to revive the old boot, fitting the boot from EC, or just throwing my hands in the air and using the y-boot kit in whole if I just can't get the boots to stay on regardless.

For the record, John @ EC recommended main jets at 150-160 and moving the needle clip to 4. Didn't mention anything about pilot jets, but I went ahead and ordered a pair of 30s just in case; it's been a while since I cracked open the carbs, but they were either 25 or 27.5 IIRC.

Per 2t Fan's note, I'll take a look when at fabbing up chassis support for it after it comes in, maybe finally put my 3D printer to use for something other than the super nerdy stuff I use it for.

[m in sc]

just fit the boot from economy, its the same boot, just not all shrunken and hard.

[quocle603]

Those are similar jet setting I currently have.