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Hello Everyone: I have been reading a lot on rejetting. I have a 1980 Yamaha XS400SG. I have it running pretty good. I was wondering what is rejetting, and what effect does it have on the bike. I was considering rejetting my bike, no changes to the exhaust. I will continue to run stock pipes...

Will these wires fit on a 1980 Yamaha XS400SG DW-300 DYNA SPARK PLUG WIRE 7MM - RED SILICONE COPPER CORE DYNATEK "Dyna" Wires are made from high grade automotive, silicon jacketed, high tension cable. All wires are supplied with finished spark plug boot ends and loose coil terminals to...

Hello Everyone I have a 1980 Yamaha XS400SG I have a small question. I have purchased a new Fuel Petcock for my bike. Here is the problem I am having. The nipple on the petcock for the fuel line to carb is facing towards the engine. My old petcock nipple is facing downward. Is there a special...

I need a carb real bad. I have broke 1 of the float pin housing on my carb. Any help would be appreciated. Thanks 1980 Yamaha XS400SG

Hello Everyone. I finally got my bike running. Heres my problem, my bike will not idle unless I have the choke pulled all the way out, and then it still barely idels with the choke pulled out. I have cleaned carb, checked for leaks at the carb boots, no leaks. I set my pilot screws/jets to 3 1/2...

I have a 1980 xs400SG. I hav just finish rebuilding the Carbs. I Think I have everything set correctly. Heres my problem, the bike will start on the first try. It idles good, but I have fuel leaking out of the L/side (Drivers Side Air Box Filter). It is (fuel) coming out pretty fast. What could...

Hello I have read many of the threads and forums and I am still a little shooken with questions. 1. How do you adjust the carb floats if they are not 26-28mm? Do you bend the float tab up or down to achieve desired height? I do know the carb must be upside down to measure the correct...

Hello my friends. It me again. First of all I would like to thank everyone on this forum for their prompt and generious help. My 1980 Yamaha 400SG Headlamp will not come on when I turn the switch on. I have swapped headlight bulbs and it still will not come on. Heres the tricky part. When I try...

Hello everyone. I have just purchase a new front Tire for my 1980 Yamaha 400SG. Everytime I put air in it and go away and comeback for a few minutes, the tire is flat again. I have taken the tire off the rim, and cleaned the rim real good, and same problem occurs. It is a tubeless tire 3.00x18...

please help it is pouring gas out of the fuel petcock