FCKing1995

iTrader: (3)

Someone just make a mikuni stickie lol, anyway, i rebuilt my mikuni 44 today, i was under the assumption the accel pump diaphragm was bad, so i bought a rebuild kit and diaphragm. i removed the old diaphragm and it didnt seem to be bad. so now im scared that wasnt the problem and i figured id ask some of you carbed rotary guys. i wont know till in the morning when i bolt it back on and try to start her. the engine would bog and try to die, but it would pick up after 2-3 seconds and then rev all the way to redline without any cutout until you let off again. this to me sounds like 100% accel pump problems, but as i said the diaphragm was fine ( looked so anyway) so anybody ever had this problem, if so what was it? that and i just wanted to use this as an opertunity to brag that my car will be drivable tomarrow!!! $800 well spent though no title, so ill have to wait for any serious driving

trochoid

iTrader: (6)

Did you order the tuning manual with the kit? The 44's tend to bog a bit transitioning from the the pilot to main circuit, you can't just mash the pedal, ease into it. The shaft for the ap has 3 holes in it to adjust the amount of squirt. I'm still playing with mine.

FCKing1995

iTrader: (3)

oh its no slight bog, anything over 25% throttle or so, itll just WHOMP WHOMP WHOMP.... bahhhhhh, until you let off then idle will return normal and start over lol. if this doesnt fix it ill just play with it a bit i guess, and no i have no manuel, where do you pick one up?

81gsl12a

iTrader: (1)

woot good luck my holley is doing that same thing..im starting to think the acc pump is to small...

trochoid

iTrader: (6)

Wolf Creek Racing, it's in the other Mikuni thread.

What are you running for a pump and fpr?

FCKing1995

iTrader: (3)

yea i got my rebuild and acc pump dia. from wolfcreek, and as for pump i dont know, but from the small glance i got at it, its not the stock one, so who knows, im pretty sure thats not the problem though, and fpr.... well i dont know that either right off hand, havent payed it much attention to be honest, only had the car for about a week now. but i dont think its the fpr either, it goes fine once it gets over the initial throttle opening, which leads me to believe it doesnt have that initial jet of fuel to get the rpm's climbing, i still wont know till morning, when i get it cleaned out well, reassmebled and installed, ill let you guys know if it works, if not im up a **** creek

trochoid

iTrader: (6)

Until you know you have a stable and measureable fuel, your pissing into the wind.

The Mikuni requires an aftermarket fuel pump that is capable of putting out a minumum of 5 psi through full throttle and then it needs to be brought down with an fpr.

You can adjust the ap, air jets, main jets, pilot and starter jets, and never get it to run correctly unless the fuel is there.

FCKing1995

iTrader: (3)

thanks for the input, heres what i found today, which is the first day oive really had to go look closely into whats on the car. the guy who installed the mikuni apparntly didnt install a fpr, so could too much fuel be a problem? or a cause of my problem? a sputter and cutout at low rpms and when first applying the gas pedal? the carb rebuild and acc pump diaphragm didnt help at all. any input?

FCKing1995

iTrader: (3)

Just took my first drive in her.... and wow! im hooked for sure now. while driving i noticed that at wot and close to wot i heard what sounded like detonation. so do you think my problem could be part fuel part timing? if so what should i do to the timing to fix detonation? thanks

trochoid

iTrader: (6)

NA's rarely detonate, but they can if you don't have the fuel or timing correct.

Get an fpr and fpg one the car before you f....k it up.

RustyRotary

iTrader: (2)

fpg? sorry, i'm not up on all of my acronyms

trochoid

iTrader: (6)

I kew someone would ask. Gauge.

FCKing1995

iTrader: (3)

well im guessing it was detonation, if it sounds anything like it does on a piston engine anyway. if it was front wheel drive i would say it sounded like an axle about to fly appart, it would only do it at 90%throttle and up. also, a stupid question and a stupid mistake on my part. in the rush to get it back on the road i left 2 hoses off the carb, both are lines on the bottom of the carb and both go to some sort of unit on the passanger side of the engine, down low, what is that unit? both hoses were off and when i got back from a short drive, i had a good bit of oil around the hoses. did i make a mistake and F*** it up? ill investigate further tomarrow, but if i did mess stuff up, im getting a 13b swap soon anyway, so no big loss, engine has 122k miles on it anyway, seen better days im sure

FCKing1995

iTrader: (3)

was just informed the fuel pump is a facet and probably isnt pushing the fuel i need, so i guess next buy will be pump and a regulator and see if that doesnt fix it. it was detonating, so lean conditions seem to be in the mix

FCKing1995

iTrader: (3)

suggestions on fuel pumps an regulators w/ gauge preferably? id also like the pump to be large enough to keep around when i do my t2 swap and build it. anybody run a walbro 255 external? im thinking that might be my route. as for regulators im lost, whats a good brand with a gauge

trochoid

iTrader: (6)

Hoses off of the carb mean vacuum leaks, which means it runs even leaner.

Carter low psi pump, Holley 1-4 psi fpr and a cheap guage. You will need a different pump for the TII swap.

If you cracked or broke an apex seal, you would know. The 12A's can run over 200k with proper maintenance and 3k oil change intervals.

FCKing1995

iTrader: (3)

i found a few carters but cant find one that says its a "low pressure" pump. anybody got a link to a site with them?

FCKing1995

iTrader: (3)

ok im a newb to the rotary scene and all of that, but i feel like the worlds biggest douche right now. i ussualy check the simple things first, but this time that wasnt so. it clicked in my head today to try toying around with the adjustment screws and the ignition timing today to see if it would solve any problems... well now the car runs much better, still a bit hesitant and laggy on anything under about 25% throttle, but at higher throttle levels it revs smooth and runs well. still need to tinker some more and get it "dialed in" better, but wow, i feel like a dumbass. i still need the fpr anyway though, the pump might be ok.