| Author | Message | ||
     Ratbuell |
Troubleshooting Kim's M2L "no fuel" issue I pulled and disassembled the carb. Stripped one bowl screwhead (of course) and have no accelerator pump action at all. Diaphragm looks ok...but no action. I sprayed cleaner thru the passages, and now have the bowl full of cleaner (brake cleaner, not carb, but should work just fine) to try and soak it overnight (at least). I'm going to get a rebuild kit for it with an accel pump diaphragm. Cleaned all the passages and jets (it's been jetted already, despite stock breadbox and muffler - 48/190 in it with the multi-hole emulsion tube; the original dealer was Hal's so it looks like they fattened it up a bit at some point). It looks like the bowl screws are 10-32 thread? Gonna grab some NON-phillips heads for them  It's also going back together with the Buell CF race aircleaner and a remote breather. This is what I get for having an '01 with only 3k miles on it....and not riding it "for her" to keep it in shape LOL. | ||
| Skntpig |
I believe you're right on the 10/32 threads. I got the allen head kit from American Sport Bike and like it. Makes getting in there much easier. Seems like those stock screws are pewter. | ||
| Rickie_d |
RatBuell - I am not sure what you meaN by “no fuel issue” or “Diaphragm looks ok...but no action”, but I will assume until you clarify, that you are saying, your accelerator pump is not discharging upon demand. Apply a shot of air to the discharge port as seen from the diaphragm cover view. If that works, you’re good to go.  If not, you might have to remove the pump jet, which most don’t realize that you can. Under that jet is a weighted needle valve that can stick, if in fact the jet is not clogged itself.  Just firmly grip the jet utilizing the flat on it and rotate it until you can twist it out. It is a press fit to reinstall, make sure it is indexed to shoot down the throat if you remove it. (Message edited by rICKIE_D on December 27, 2009) | ||
| Dave_02_1200 |
The reason the float bowl screws strip so easily is that they are intentionally made with very soft material. This was done so the fastener would fail before the threads in the carb body stripped out if the fastener is overtightened. Mikuni details this in the HSR 42 Tuning Manual. After reading that and hearing about people stripping carb body threads with allen-head screws, I went back to stock fasteners. Now I replace them whenever they look worn. However there is another reason why the head stripped: Those are not "Phillips" heads, they are "Japanese Industry Standard" (J.I.S.) Phillips screwdrivers do not engage the slots correctly. When you get a JIS screwdriver, stripped JIS heads will become a thing of the past. You can find a cheap one in an OEM toolkit from any Japanese bike or buy a good set. You'll be glad you did. Good luck. | ||
| Devil_car |
Before you rush out and buy screws, keep in mind that this carb was made in Japan... I'm probably wrong, but I believe the fasteners on the carb are all metric. | ||
| Ratbuell |
aha! I didn't know there was a needle in there, I pulled the pump jet out but didn't see/look for a needle underneath (haven't broken that particular feature yet I guess lol). I'll re-remove and look again  But yes...no fuel discharge from the accel pump on throttle twist (and no start - initially I assumed a clogged float needle...but we'll see). Good tip on the j.i.s. screwheads, too. Depending on cost, I may go that route instead. | ||
| Rickie_d |
Oh no, if you had the jet out and did not notice the needle; you might have inadvertently lost it if you did not hear the “tinkle” of it hitting the bench or floor. Let me know if you lost it and cannot locate one…There are plenty of donors around with all the HRS42’s replacing them.  | ||
| Ebutch |
Ditto Rickie.  | ||
| Ratbuell |
Huh. There IS a needle under the accelerator pump nozzle. Who knew? LOL Pulled the nozzle back out and peered down the hole, and saw...SOMEthing. Turned the bowl upside down and tapped it on the bench. Nothing. *Whacked* it on the bench, and out came a needle. Neat. Once I pulled it, I ran it through the wire wheel to remove any burrs (and to make it just *that* much smaller), put it back together, shook the bowl...and heard it rattling. SCORE. Filled the bowl with FI cleaner, put it back together, and the accel pump works now Now, if only the battery wasn't dead.... Oh. And the bowl screws *weren't* 8-32. But they are now. Tapped 'em out so I could put in a set of stainless buttonhead allen screws. Much better. (Message edited by ratbuell on December 30, 2009) | ||
| Rickie_d |
Rat - - buggers...they only referance it in the service manual diagram of that circut, but not in exploded views!!! glad it worked out! (Message edited by Rickie_d on December 31, 2009) |
