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I am trying to upgrade the main jets on my 2007 F40TLR. Found the pilot jets on jetsrus, but they did not have the correct diameter thread for the main jets. I changed the pilot jets but still the same troubles as before with the hesitation and stalling out.when accelerating. Had a lot of hope as quite a few people have said the re jetting is the cure for the carbs from Hell. The frustration continues as I have not been able to find these jets except for the stock #95. Any help would be appreciated.
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The main jet from an F25LA model will work. It is a #108. Expensive if from Yamaha. Or you could drill your jets out a size or two at a time and see what happens.
Have you verified that the accelerator system is working correctly in your carburetors? You should be able to see a visible stream of fuel flow from the accelerator pump nozzle when the carburetor is opened up quickly. The nozzle can clog and a ball in the float bowl can get clogged and jam up. -
This has been an ongoing problem with this motor. Yes always expensive from Yamaha. Considering getting some bits and drilling. Going to check out the accelerator pump tomorrow. Thanks
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Send me an email address via PM and I can send you some literature regarding proper cleaning of the carburetor.Comment
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