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Motorcycle Repair/popping at idle


Hi, I have an 05 Honda Shadow Spirit Vt1100. It has a stage one jet kit installed with aftermarket exhaust. It has been running perfectly with this setup for two years. Two days ago, I noticed popping coming from the rear cylinder only at idle. There is no problem on the highway. Thinking it was an air leak,I checked the head bolts at the crush gasket and the carb boots. All ok. I then ran the A/F mixture screw in to seat and back out 21/2 turns. I started the bike no problem but it still pops on that cylinder. here is the odd thing, if I turn the A/F mixture screw in to seat while the bike is running, there is no change in rpm. When I do this for the front cylinder, the rpm changes immediately. I have a shop manual but this is not on the troubleshooting page. I have no problem removing the carbs as I put the jet kit in.
Thanks for your help.

I think there is something in the Carburetors clogging the Slow Jet which
it uses to Idle. Pick up some SEAFOAM at the auto parts store and use
it only per Instructions. This might dissolve or Help remove what blocking that jet.
If that don't solve the Issue then the Carbs should be removed and Cleaned... Joe  

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william joseph stack


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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