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You've all been very helpfull with my 400f build. Its complete now but I'm still having the same problem as before. I'm at my wits ends. I've had the engine bored to a 466. Before the rebuild the bike ran great, no smoke just a siezed cam chain tensioner. I had it jetted perfect then BOOM. after...

I've been on this forum for a while now, bothern all the 1000+ posters for answers so I figures it was time to explain myself alil bit. My history consists of nothing but Dirtbikes. I'm a 3rd gen racer, turned pro 3 years ago and haven't looked back I work a lot. I have a ton of visible tattoos...

So I've got the stock 400f jets in my carbs as of yesterday and my bike still runs fat. But I have found something that might be making it run shitty. The o-rings on my main jets are hammered. And when I take the jets out the long brass piece that the needle slides into falls out freely. Could I...

I researched all the info on boring my 77 cb400 from its stock displacement to a 466 and now I have the piston kit, new gaskets etc. I took the cylinders to my machinest and he told me that there wasn't enough sleeve left to bore out to the new displacement. I thought the stock sleeves were...

Here in the near future I plan on boring my 400f to a 466. I had a ring snap and score up #3 pretty bad, so i figured i'd bore her up! I just wanted to ask all if anyone has any tips, or advice so that when i go ahead and do this its bulletproof. Stuff like ( clearance's installation tips, (the...

alright ton'rs i just rebuilt my 77 honda 400 to near perfection but i am having trouble getting her strait.I put the motor all the way together but now she runs super fat, and blubbers black smoke, i tore it down to find nothing wrong, is it possible that i 180'd the cam? and how can i tell...

so when i first got my cb400 up from the dead the wiring and lights all worked fine. then after about 50 miles the intire light system started to dim and get brighter from about 2000 to 4000 rpm then stop in the higher rev. what causes this? thanks!

ok guys, so I am new to the ton. But not to bikes. Been racing mx since I can remember. Decent mechanical skills (fix all my own stuff). I just recently bought a 1977 CB400f and a 1974 CB550 for my dad. so far the 550 is all good, but i had a bit of thinking to do on the 400f. Here goes; tore...