mikuni confusion
07-24-09, 06:16 PM
#1
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mikuni confusion
ok guys i have a s4 six port with a mikuni 44phh on a plenum like manifold that i fab'd up in my yard, yea its not pretty 
but anyway it starts but wont stay running any longer than like 5-10 seconds and i have no idea why. im only 18 and i have never had any experience with carbs on cars, let alone side drafts.
i wanted to know what are the two vaccume nipples on the bottom and the one on the top. the two on the bottom were plugged when i got it, should any be plugged? and would that have anything to do with i not staying running?
but anyway it starts but wont stay running any longer than like 5-10 seconds and i have no idea why. im only 18 and i have never had any experience with carbs on cars, let alone side drafts.
i wanted to know what are the two vaccume nipples on the bottom and the one on the top. the two on the bottom were plugged when i got it, should any be plugged? and would that have anything to do with i not staying running?
07-24-09, 06:47 PM
#2
There's actually 4 nipples on the bottom. Two are for the oil feed lines from the Oil Metering Pump (1 on each barrel closest to the passanger sidewall.
The other two which are a little longer (1 on each barrel closest to the driver sidewall) are for coolant. I plugged mine.
The one on the top is a vacuum source. You can use it for the distributor advance if you're still using that or plug it. If it's not being used or plugged then yea it'll be a vacuum leak.
Check these:
https://www.rx7club.com/1st-generation-specific-1979-1985-18/post-your-mikuni-carb-pics-525625/
https://www.rx7club.com/1st-generation-specific-1979-1985-18/mikuini-carb-questions-844438/
The other two which are a little longer (1 on each barrel closest to the driver sidewall) are for coolant. I plugged mine.
The one on the top is a vacuum source. You can use it for the distributor advance if you're still using that or plug it. If it's not being used or plugged then yea it'll be a vacuum leak.
Check these:
https://www.rx7club.com/1st-generation-specific-1979-1985-18/post-your-mikuni-carb-pics-525625/
https://www.rx7club.com/1st-generation-specific-1979-1985-18/mikuini-carb-questions-844438/
07-25-09, 11:42 AM
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sweet pic and thanks for the help, im running premix so i capped off the omp lines. the car will stay running but only if its choked and i keep revving it. so, not enough fuel. im thinking a vaccume leak or something of that sort. any input would be great, thanks in advance.
07-26-09, 12:18 AM
#6
Mine was doing the same thing. Only ran with the choke on...
The manual actually calls it a starter not a choke b/c *I think* it actually does the opposite of choking off the air and instead sucks in more gas...??? Don't hold me to that.
When I get home if noone chimes in by then I'll post the directions I used to get her idling w/out using the starter haha
Checkout www.WOLFCREEKRACING.com You can get the manual for about $10. I actually found them selling em' on e-bay. It was worth every penny / dollar.
The manual actually calls it a starter not a choke b/c *I think* it actually does the opposite of choking off the air and instead sucks in more gas...??? Don't hold me to that.
When I get home if noone chimes in by then I'll post the directions I used to get her idling w/out using the starter haha
Checkout www.WOLFCREEKRACING.com You can get the manual for about $10. I actually found them selling em' on e-bay. It was worth every penny / dollar.
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