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I have alot of screws on my bike that I just cant take off, its just too tight.
I tried WD40 but I still cant unscrew, If I try to force it I may strip the screw. I think some of the screws are already striped, what should I do about those ones?

Help would be appreicated, thank you!

after some tune-ups now my bike is running alot better now.

but for some reason my bike seems to run ok at low and high RPMS, during mid RPMS the bike will lag. The higher the gear the stronger the lag. Why does it lag during only mid RPMS?

Sometimes if the RPM is too high if you pull the clutch ...

I dont know how to check most of the stuff you named.

but I did discover one thing, my new spark plugs are getting black already. I heard black spark plugs means it's running too rich, how do I fix that problem?

I tried to unplug the gas hoses and turn the key to ON and I see gas shooting out. There is a hole near the top of gas tank for venting.

I tried riding even with the air filter off completely, problem still there.

I tried riding even with the air filter off completely, problem still there.

I tried to unplug the gas hoses and turn the key to ON and I see gas shooting out.

from my experimenting, the bike usually start to act funny after about 25MPH but when its on neutral with my bike standing still the ...

1991 Yamaha FZR600

I just replaced all 4 spark plug with new ones, I think the 3 of the old ones failed the spark test.

But once again back to the old problem, The engine starts ok and it idles at 1100-1300RPM OK. On neutral, I rev up to 4000-5000RPM it falls back on 1200RPM OK.

But when I drive the bike on 1st or ...

I just replaced all 4 spark plug with new ones, I think the 3 of the old ones failed the spark test.

But once again back to the old problem, The engine starts ok and it idles at 1100-1300RPM OK. On neutral, I rev up to 4000-5000RPM it falls back on 1200RPM OK.

But when I drive the bike on 1st or ...

which part of the spark plug has to be touching the engine block?

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