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Motorcycle Repair/1971 honda sl350

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Question
im working on a 71 sl350 and at 40 miles an hr it falls flat and loses power, im not sure about my valve clearance or my points adjustment, ive got good spark and fuel flow my compression reads to about 170-175psi, ive cleaned and adjusted the carbs but it continues to smoke and run rough

Respectfully
Kc

Answer
It sounds like its running out of fuel.
Fuel levels may be to low. Check the air filter to see if its dirty. A dirty Filter can cause a choking effect. Also the air jets or carb bowl vent holes may be clogged.
What color is the smoke. Black smoke means its running to rich, to rich of a fuel ,mixture.
Blue smoke is oil. which could be a number of things. Valve guides. Broken oil ring.
Also a rich fuel mixture can foul a spark plug in 20 minutes.
If the smoke is not blue and there is not oil in your air filter, I would
suggest a professional carb rebuild. Visit my website www.viragocarb.com.
I rebuild all makes of carburetors.
Also do a search on a tool called a (Gunson Colortune Tool)
Its helps you set your fuel mixture Perfect....

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william joseph stack

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I specialize in Virago carburetors. Internal parts sizes, Needle and jet sizes for each and every year and model. Hitachi and Mikuni. I also can give tech support and Tech Support for carburetor problems and issues. Carburetor tuning and syncronization. Carbburetor rejetting and dynojet installations for engine modifications. I know every needle and jet size for every Virago made. I have done over50 Virago carb Salesand Rebuilds in 2012. I have over 50 sets ofVirago carbs in stockright now. I Build, Ride and Breath Virago. I have both the 1983 Midnight Virago's. The XV750MK and the XV920MK. 1 of my 1981 XV750H is is Premier Cycles, Billy Joel's Bike Museum.... I am an Honest and Fair man. I am also a Finicky Perfectionist withmy carb work. Ihave all the obsolete hardto find carb parts. I have new diaphragms, new floats, I have the float level setting down to an art. I have fabricated transparent bowls for both version 1 and version 2 carburetors.

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