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I have decided after much thought to run a 130 and 120 main jet respectively get them next week and I will report back. SM

So 127.5 main 117.5 main and both pilots are 45. The two main jets are stock and the pilot jets should be 42.5 stock so they have changed the pilot jets. Since the mains are stock is it possible that I need to go up a size in the mains to give myself better performance on the top end? Could...

Just letting you know that this is the first time I have pulled the carbs on this bike. I ran a cleaner solution the first time as the people I bought it off said they just did a full clean...never believe people apparently. So I have a small pinhole in one fone of the CV diaphrams. I am just...

JUst pulled my carb out. Turns out that one of the boots that is on the engine side of the carb is cracked and the lobe that the bolt secures the boot to the engine is broken... I assume a vacumm leak on the downside of the carb could cause my top end power issues? SM

The only modification I can see is the 2 into 1 exhaust with a slip on megaphone muffler. It does have me wondering though if they didn't think to gap the plugs, would they have re-jetted after installation. Also could the out of spec exhaust valve cause some of the problem? or could it be...

Hello, I am a new member to the forum, not a new Yamaha owner but new to the XS400 market. Current bike is a 1982 Yamaha XS400R SECA. I bought the bike for $600.00, was having issues with it not starting properly, discovered previous owner had forgot to gap the plugs 0.o. Other yamaha's I've...