jaguar
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I pulled the plug and it was carbon fouled, and sooty. Thanks for the info, ill check with my cycle dealer if he has some more needles...Well my full write-up on jetting is at Needle Selection
Reducing the main jet size also affects mid throttle jetting as you can see on my graphic above.
If you feel the mid throttle jetting is still a bit rich then you can lower the needle although the right way to do it is to buy a needle with a lesser taper angle.
From using my calculator I now believe the clip position shouldn't be used to change mid throttle jetting but to set when the needle taper kicks in which for most PWK carbs is at 25% of the slide height. If you use a felt marker to put a black dot on the needle right where the taper begins and then lower the slide in the carb till the dot is right at the top of the narrow part of the needle jet then you should measure that slide height. Change the clip so that it's at 25% of car bore. And then select a different needle if you want to change how it is jetted at mid throttle.
Jaguar, I ordered a new set of reed valves, boyseen, and im down on the pilot from a 58, to a 55. Is a 160 on the pilot safe? I bought the bike with a 160 main jet and the engine never burnt up. 2nd piston in it looks good. It calls for a 178 main, and a 58 pilot, third position on the needle. I changed oil to sikolene from maxima 927 and it seems to run a bit cleaner. I just rode it a couple of hours ago and it still bogs off idle, but giving it the gas, it screams pretty fast! LOL! Thank goodness for breaks!dump it!
off idle is the domain of the carb slide and the clip position.
Ok, great, ill experiment, I am glad I have a fresh piston and rings, I wonder if the ethynol in the gas is causing all these bikes to run poorly? I remember back in the day, you mix your fuel, splash it in your fuel tank, and enjoy a nice day of riding. Now all i do is try to keep my bikes running, Thanks again Jaguar!Move the nedle clip up and try it.
then move it down and try it.
You can go as thin as 50:1 on that Silkolene.
Wow! We have 10% ethynol here in DFW, I mix it with staybil fuel treatment, 1 oz per gallon, and it "seems" to help. I miss the old days when fuel was cheap, and not too many additive were added to it. Just put my boyseen reeds in, and I noticed something, the original owner forgot to put a gasket on the reed block? I had a big task, but its now running great. I will try to find some ethynol remover at auto zone. You had to split your cases for seal replacement, thats no fun!It is advised to stay away from ethanol laced gasoline but if you have to use it then you have to jet richer for ethanol. I was using ethanol gas unknowingly on a bike with the old style seals that arent ethanol-proof and soon enough I had to split the cases to replace the seals.
Thanks again Jaguar! I promise no chem-soups.You can remove the ethanol yourself (please no chemical soup mix!): How To Remove Alcohol From Gasoline
or look up where to buy ethanol free gas in your area: Ethanol-free gas stations in the U.S. and Canada
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