Just picked up my 2001 929 Blade. It has an awful misfire at 5.5K revs, the guy i bought it off says that he fitted the standard can back on the bike for the mot and didnt really ride it at all since then. He gave me a Micron carbon race can with the bike which was fitted previously. Now i havent had a chance to have a good look, but, if it has a power commander fitted somewhere which was set up for the micron, would putting the standard can back on it cause this misfire? Just so you know how bad this misfire is, in top at 60 mph it will not pull through it. Anyone any ideas?
It could be down to it over fuelling now that the standard can is back on. You could load a zero map into the power commander and see how it runs then, that would be the quickest and easiest route. Or remove the power commander so it's back to standard. If it's still the same then it can be a number of things to be honest.
Lets see if i can find a Power Commander first. I hpoe there is one there somewhere otherwise, I cant figure out why it should misfire right in the emmisions testing area if its got a standard can on it with a standard ECU map
Ah. Sorry I thought it had a powercommander. If not then it can be anything really. Maybe a fecked/clogged injector or even a piston ring. Arthur might be able to help u a little more on that front
Its a bit suspicious that it happens at the exact point in the rev range that the emmisions are tested at, i.e. The leanest programmed measurable point is giving grief. I suppose that if it was programmed for a free flowing air filter and a race can, and you just stuck a standard can on it, resticting the flow and richening the already enrichened mixtue at the point at which the mixture was the leanest on standard settings, it would overfuel at the point it was designed to underfuel as standard, i.e. at 5.5K? Or am just talking out of my arse? Navel gazing? Overthinking? Try checking if the plug caps are on properly? I'll try that last one in the morning i think.... It still went like stink above 6K tho!
Overthinking.....lol. I'd change the plugs first, sounds daft but sounds like bikes been sat around, coil packs could be causing the problem too but would be hard to check unless you have some kicking around. What's the overall condition of the bike, loom, under the panels etc?
You may think me mad but sometimes new plugs can fail, hard to say what could cause the problem from where I am sat but often the problems are simple... fingers crossed your is no big deal.
I had a carburation issue with my Ducati that killed spark plugs, especially the Iridium ones i was 'advised' to fit to 'cure' the problem. Plugs are more fragile than you might think.
Its fixed. On close inspection, the exup (yes i know it isnt called and exup on hondas but you know what i mean) valve cables wern't connected to anything, we tested the servo motor and i wouldnt work untill you touched it. So, a pile of cash later up at D+K in stoke and i had another servo motor. This morning i fitted it, routed the cables and adjusted them. The mystery of the missing airbox flapper cable was solved when i removed the airbox lid to reveal a K+N filter and no flapper valve! The valve was locked (properly lockwired) in the fully open position originally, but when i adjusted it closed by about 30 degrees and locked it off for the trip to D+K, it ran a lot better. I'm glad it was giving me so much grief in the beggining, because im sure you could adjust the valve so it gave no misfire but would still give a reasonable spread of power, if you had never ridden one before you wouldnt know it wasnt connected. Anyway, its sorted now, thanks for all the suggestions.
