There's a streetlegal (baffled) one and a loud straight-through one. With the former you can get away with not rejetting. The latter probably needs bigger jets but can't say by how much.
K&N as in replacement filter in the stock airbox, or a pod filter replacing the airbox? If the former then makes no difference, if the latter, who knows what jets you'll need. ;-)
I had an '89 Dommie with streetlegal produro and K&N filter in airbox. After lots of faffing about ended up with snorkel cut off, #50 slow and #152 main, which was ever so slightly lean at the top so the stock #155 (which I'd lost by then) would've been good too.
What do you have in there now, and how does it run?
It's the street legal with the end baffle (mesh) removed. The K&N is in the stock air box and no idea what size jets are in at the moment. My plan is to replace them to try and cure the stalling problem. What do you think? The bike runs and pulls well although a little stutter at low revs...
Yes, it still has the main baffle in. No I havent tried the mixture screw as the plan was to just replace them before the trip. Also had fuel coming out the carb overflow last week, although it seems to have rectified itself now.
So 50 slow should sort the stalling issue?
Did for me, but you really might want to try the mixture screw first, it's what it's there for.
It's a petrol screw, so further out is richer mixture.
Best way to do it is to have the bike well warmed up, let it idle and turn that screw out until you get the highest idle rpm. If rpms starts to drop again you're too rich so go back a 1/2 turn or so, but if my bike is an indication the mixture screw will fall out before you reach that point. Hence the #50 in my case.
They run a bit lean on idle from the factory, mine especially did because it was a US model. Making it a bit richer will reduce the stalling and might even fix that low rev stutter (depending on how low rev).
Putting the #50 in probably won't hurt (and you'll have to adjust the mixture screw then anyway!) though if it's not needed, it saves buying another pricey Honda part. ;-)
Probably some Honda special tool made of unobtanium, but bodges include a screw bit in a small spanner, or possibly a bit of rubber hose stuck on top and twisting by hand if it's loose enough. Experiment. ;-)
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