What do I have to do...
#1
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What do I have to do...
...to get some replies around here? I thought this was the best place to get help, but I've posted two threads now about tuning my Mikuni and nobody has anwered my question yet. I know rx7doctor or carl and probably quite a few more should now about Mikunis. What I need to know is if I should go with a smaller main fuel jet or go with a larger main air jet to lean out the mixture. Could somebody please help me. I have a meet to go to in less than a month and I need the car to run good for the 5 hour drive. Help would be greatly appreciated.
#2
Banned. I got OWNED!!!
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well honestly, alot of people DONT know about mikuni's. it's not a commonly used carb anymore. everyone here usually knows the nikki's, webers, and holleys. hell post about a holley and you hardly get any help. it's not you, and it's not the fact that people dont care. its just not common knowledge. sorry bro.
NOW, in general you cant just ask, what do i need to do to lean out the mix. if you drop the main jet size, your top end will be lean. if you get a bigger air bleed then your mid range will suffer as well. when does this problem start and why do you think it's rich? i may be able to help you out with general tuning knowledge here.
NOW, in general you cant just ask, what do i need to do to lean out the mix. if you drop the main jet size, your top end will be lean. if you get a bigger air bleed then your mid range will suffer as well. when does this problem start and why do you think it's rich? i may be able to help you out with general tuning knowledge here.
#3
Just soak it in 2-cycle
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I know the feeling, I've had a lot of trouble getting help with my Mikuni. The thing still is a bundle of mysteries to me. If you want the manual, which has a ton of information, go to http://www.wolfcreekracing.com/. You can order it for $10. They also have parts and rebuild kits.
When it comes to tuning, that's definitely not my specialty. I'm letting AIM deal with that lol. They've got a dyno and a lot more experience anyway.
When it comes to tuning, that's definitely not my specialty. I'm letting AIM deal with that lol. They've got a dyno and a lot more experience anyway.
#4
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at least 5 people have helped me before so there's enough people that have experience with Mikunis. They just don't seem to ever read my posts any more.
I know my car is running rich because you can smell it in the exhaust and you can see the black spot covering my right taillight. It runs rich all the time as far as I know. People who drive behind me complain of the richness.
I know my car is running rich because you can smell it in the exhaust and you can see the black spot covering my right taillight. It runs rich all the time as far as I know. People who drive behind me complain of the richness.
#5
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All 7's have the cologne factory going. Look, I have a Mikuni 44phh and I have gotten the following jet sizes verified over and over from different sources on both coasts and in between, so here goes:
Main Air Jet = 240
Main Jet = 200
Pilot Jet = 62.5
Pump Nozzle = 90 ( Special Order )
Also, Do you have the 24 page PHH Carburator Service Manual ?
I would like to know if there's anybody out there with parts and facility to rebuild a 44phh. I think I'd just send mine for a freshening if it were reasonable.
Main Air Jet = 240
Main Jet = 200
Pilot Jet = 62.5
Pump Nozzle = 90 ( Special Order )
Also, Do you have the 24 page PHH Carburator Service Manual ?
I would like to know if there's anybody out there with parts and facility to rebuild a 44phh. I think I'd just send mine for a freshening if it were reasonable.
#6
Originally Posted by Misthael
at least 5 people have helped me before so there's enough people that have experience with Mikunis. They just don't seem to ever read my posts any more.
I know my car is running rich because you can smell it in the exhaust and you can see the black spot covering my right taillight. It runs rich all the time as far as I know. People who drive behind me complain of the richness.
I know my car is running rich because you can smell it in the exhaust and you can see the black spot covering my right taillight. It runs rich all the time as far as I know. People who drive behind me complain of the richness.
#7
Lives on the Forum
Sorry man, no Mikuni experience here. I will make one suggestion though, if you have not upgraded your ignition system yet, do that before you start leaning out your carb to ensure that you are burning as much of the fuel as possible. Good luck.
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#8
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Originally Posted by DAVID GRIMES
All 7's have the cologne factory going. Look, I have a Mikuni 44phh and I have gotten the following jet sizes verified over and over from different sources on both coasts and in between, so here goes:
Main Air Jet = 240
Main Jet = 200
Pilot Jet = 62.5
Pump Nozzle = 90 ( Special Order )
Also, Do you have the 24 page PHH Carburator Service Manual ?
I would like to know if there's anybody out there with parts and facility to rebuild a 44phh. I think I'd just send mine for a freshening if it were reasonable.
Main Air Jet = 240
Main Jet = 200
Pilot Jet = 62.5
Pump Nozzle = 90 ( Special Order )
Also, Do you have the 24 page PHH Carburator Service Manual ?
I would like to know if there's anybody out there with parts and facility to rebuild a 44phh. I think I'd just send mine for a freshening if it were reasonable.
Wolf Creek Racing: http://www.wolfcreekracing.com/classified.htm
Go halfay down the page for Mikuni parts.
#9
Old Fart Young at Heart
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Quote from the Mikuni manual, p. 20
"D) If engine runs rough or hesitates, or if there is exhaust afterburn or dark exhaust smoke: Indication of a rich fuel mixture. Change to a smaller pilot jet, one size at a time, until knocking is apparent, then try one or two sizes larger to obtain best jetting."
The pilot system works from 0-20% throttle, which is most normal driving, other than hard acceleration. The main air and fuel jets regulate the mixture under power or acceleration.
Buy the book, it will help you understand how the carb works and how to tune it.
I have 2 Mikuni's I bought off eBay, the one for the 12a has a 52.5 pilot jet, the one for the 13b has a 57.5 pilot jet.
"D) If engine runs rough or hesitates, or if there is exhaust afterburn or dark exhaust smoke: Indication of a rich fuel mixture. Change to a smaller pilot jet, one size at a time, until knocking is apparent, then try one or two sizes larger to obtain best jetting."
The pilot system works from 0-20% throttle, which is most normal driving, other than hard acceleration. The main air and fuel jets regulate the mixture under power or acceleration.
Buy the book, it will help you understand how the carb works and how to tune it.
I have 2 Mikuni's I bought off eBay, the one for the 12a has a 52.5 pilot jet, the one for the 13b has a 57.5 pilot jet.
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I guess I didn't read that page in the manual. Thanks for pointing that out Trochoid. I'll see what size pilot jets the carb came with and maybe order some new ones. I just wish you could rent jets to find the correct size then purchase that size. I probably shouldn't have rushed into buying hte smaller main jets. Oh well.
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