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Okie dokie....tuning time, got it ok but needs better. I made a manometer for my goldwing last year and worked great, was thinking I would again for this, but its s but different. On the wing you adjust in pairs then adjust the pairs. How would it work on this? Tube onto each carb from gauge (fluid filled bottlr) then from gauge to gauge? Thanks. I'll prob overthink this...
That's the way. As long as all four "gauge" sides can find their level being connected, you're good. With the 77-78 750s, you have to tune to #2 because it's not adjustable, so all the matching has to come from 1,3,4 being adjusted.
I think I'm retarded....been reading too much again. Jetting....if my idle won't lean I need new pilots right? Since exhaust is 4 into 1 and carb is open...why is running rich? More air coming in means it would need more fuel right? Shouldn't it be lean unless jets are drilled? It wont lean out. I have it tuned and synced, runs and idles...just stinks and plugs are sooty. I'm working on the math...can someone dbl check me...
A #40 jet sould be approx. A #78 or #79 drill bit..but those are too small, I go down to a #73 then a #72 doesn't fit. Safe to assume they are drilled? I'm ordering jets today...
I've tried both....in and out. Also...starts with no choke. Blows lots of black smoke when turned out 1/4 at 1/2 and 3/4 throttle. Runs better at 2 to 3 turns out. Not sure if theres much difference after 2 turns out. Is my math wrong about the drill bit size not matching the jet?
Your logic sounds good, but ignores a couple of variables:
Float/fuel levels. Set fuel level to 3mm below the gasket surface.
Air passages in the carbs. Clean out the airways to be sure that enough air is getting in to mix with the fuel as it passes through the pilot jets.
Jets: I have no way to convert # sized drill bits to flow rates, but you could do worse than to buy a set of new OEM jets from JetsRus or your local dealer. #78/79 is around about 0.4mm which is what a #40 pilot jet is, so they sound like they are in the ball park for size.
Thanks man. Floats are set to service manual specs. I did them. I ultrasonic cleaned and blew 120lbs air throughout...how I've done every other carb with zero issues. Normally have no problems after cleaning...guess I could clean them again. Jetting troubleshooting is new to me. Just trying to make sure my logic is sound lol. I'll be ordering all new stock jets and others to figure it out.
The F, with a 4 into 1, ran a 35 pilot vs the 40 for the K . You have to remember that it requires vacuum to suck fuel out of the bowls, so they needed to be leaned out. When you push more air through a venturi, you get more vacuum.
I had just one cylinder running way rich on my Hunley GL1000. Finally found that the needle jet was erroded so bad that fuel was always gushingfrom it, even with slides closed. Replaced it (used the same needle) and now it is great.
Thanks for that thought..these have been replaced and are in great shape. I have a problem of researching to much instead of just doing it lol. I have what I believe should be stock 40 pilots in route now along with alot of main jets. Should be able to get it...just gotta quit reading and dig in. A color tune also on way.