I've put about 10k miles on the bike since I've had it and it has between 18 and 19k on the odo now. The motor has been very strong the entire time I've had it until a few nights ago. I was riding home from work and I noticed a slight hesitation if I opened the throttle too quickly. If I gradually opened it up everything was fine. The next morning I start it and warm it up to about 120 F and take off for school. Its sounding a little deeper, not normal. I get to the bottom of my hill maybe .2 miles away and it dies. Start it back up and ride back home but its bogging down the whole way. Hesitation gets worse and worse as time goes on. I also have been noticing this quick clunking sound that happens maybe a few times when its warming up, every time it clucks it seems to be followed by a very slight rpm drop. The sound seems to come from the engine case but I can't really tell from where inside. Anyway I replaced the plugs which were pretty corroded and cleaned out the contacts on the coils as much as I could, threw a little bit of injector cleaner in with my gas. Runs just as bad as before tho, wont hardly start. Bogs hard in neutral, if you snap the throttle open it just dies.

I'm really concerned about that clunking noise any ideas what that could be? And any ideas in general to get this thing running well again?

 

could that clunking be from the HTEV? I don't really understand why it would be moving during warm up, but if your ECM is crappin' out, well, a lot of strange things can happen... would also explain the poor running. Best of luck, and i hope someone else can say something more useful for you.

 

Can you take a video of the bike making that noise? Maybe you're timing chain skipped a tooth and that sound is a piston hitting a valve. That would also cause your compression to be terrible and the bike run like a poop burger.

 

check your fuel pressure regulator.

 

been working on it over the weekend and check a few things.. cam spockets and the timing inspection notches all line up, i loaded a new map on my PCIII, double checked to make sure all the wires were hooked up right to the plugs and injectors. Put everything back together, started it up and it idles okay but if you give it even 1% throttle it dies instantly. Now its throwing codes 1 and 9: map and iat sensor... any ideas on what to do to get this running? Ive tried disconnecting my PC too but it runs the same.

 

figued it out! I took my fuel pump out of the tank and a pile of rust chips had accumulated at the bottom and was clogging it up. I cleaned that out as best I could with some degreaser and compressed air and it runs great.. I accidentally overheated it to about 250 though by forgetting to plug the fan in, so that kinda sucks but I think its fine. I'm glad I caught it tho for sure... I think im gonna find a fuel pump on ebay and buy a new filter tho so I can be sure I have a clean one.