Re: Needle shim modification
Too funny I just read this tip, and one of my first mods to any bike that has a slight lean stumble off idle and into the mid range is to shim the needle. Modern bikes come so EPA lean with respect to low speed jetting they run like absolute garbage in cooler temps (like we have up here in New England). I drove our new GZ for about 1/2 hr in colder temps and knew right away my carb need some richening. I have a bunch of 3mm X .020" washers I got from Radio Shack, and they work perfect for shimming needles. I also pulled the "epa" plug for the air fuel screw, and added 1/2 turn CCW for some much needed cold starting ease. Now even if it's 40F, our GZ fires right up on 1/2 choke as soon as I hear elevated clean rpm's I shut the choke off and the engine purrs perfect. No mid range stumble either. I've shimmed needles and many times also have to bump the pilot jet(s) one size richer too, but so far doesn't seem like the GZ will need a richer pilot jet. Great tech thread !
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Re: Needle shim modification
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Re: Needle shim modification
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:) :cool: |
I did the needle shimming yesterday and today, while riding, my bike stopped for no reason, it just started to make less noise then stopped all together. I was able to start it again after a couple of tries and get back to work. Do you think it might be related?
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While doing the shim, you mess with a couple of things that could cause an air leak. A big enough air leak and you loose vacuum to draw fuel, which would eventually kill the bike.
Make sure your vacuum hoses are connected. Make sure your carb boot is secure Make sure you didn't kink the fuel line Make sure you didn't pinch the rubber diaphragm under the black plastic cover on top. (That happens a lot) |
Ok thank you !
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