Question:
Here's the deal ,bike has 16,000 miles on it,Vance and Hines pipe,stage III carb kits with K-N filters ,and a one tooth smaller front sprocket.Bike runs awesome under full or close to full throttle, but to just kinda cruise around at normal sppeds I have to run it on half choke or it sputters and just doesnt run right.I imagine it needs to be fattened up in the carburation department but I am not really sure how to do it.I am going to put in new NGK iridium plugs in it and also clean the air filters,any help on which screws to turn on carbs AND which way to turm them would be greatly apreciated!
Answers:
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Before you do any jetting you should check for intake/air leaks. the method I use is while the bike is idleing spray a conservative amount of brake cleaner on the union of the manifold and carb. If the bike stumbles its a smaller air leak, if it dies that is a big air leak. To re-jet you have to remove the float bowls (some carbs have a plug on the bottom that allows access to the main jet)Remove the main jet( a little brass screw with a hole in the middle). The jet will have a number stamped in it like ( 120 or 140). replace the jets with a couple sizes up ( if you have 140s go up to 150s).
Run (ride) your bike normally ( no choke) take a look at your plugs, the white ceramic portion surrounding the electrode should be a tan color( close to the color of dry cocoa mix). If your plugs are still white go up a couple more sizes.
Be aware if you go up more than a few main jet sizes, you will need to change the pilot jet to the next larger size.
It can be tricky to get it right and it does take some trial and error.
If you are not really confident it may be worth putting it in the shop, especially with multiple carbs.
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If you know which are the fuel air mixture screws you could turn them in 1/4 turn to enrich the low speed feed ,but you run the risk of putting your carbs out of sync.
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absolute best way.have it put on a dyno. they'll dial it in razor sharp. usual dyno time is about 60 bucks an hour in my area.What is a one wheeled cycle called?
not sure what carbys your running...On a '71 DT 250, what should the points gap be set at?
can you raise the needle one notch??
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you might want to do this before you put it on the DYNO..
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but it will have to go on the DYNO at some stage to get it right...
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Dont turn screws, If you have made mods and got this from your work. You need to rejet. If this has come to you by its self you need to get back in your carbs. Look at mid and low speed jets. Runing your bike on half choke is not a screw fix. Go back to work its all fun.More Questions & Answers ...
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