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Old July 13th, 2019, 01:09 AM   #2
59096
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Name: Garry
Location: Bungendore Australia
Join Date: Jan 2019

Motorcycle(s): GPX250 1989 model and 1990 model

Posts: 98
Hi Daniel,

When you say it has the snorkel removed are you referring to the piece with two holes in it that fits into the rear top of the air box that you remove to service the air filter? I have found that even small changes to the intake or the exhaust can upset the carbs. I drilled four 10mm holes in the end of each of the stock mufflers and that very small change caused a loss of mid range so I would expect the Yoshi slip ons to have some effect as well as the K & N air filter. From your description the problem so far is only evident in the idle circuit where it transitions as you open the throttle. Sounds like it is now running lean there and shimming the needles should help. You might find that it is also effected in the mid to high range and you might have to look at bigger main jets. There are plenty on this forum much more experienced than me in this area and I am sure your problem will be solved.

Cheers
Garry
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