Planet Minis

HatterasCast · 08-06-2008, 08:12 AM

I have a mikuni 26mm Carb hooked up to my motor and i have some issues with it.

When I turn my fuel pet cock on, I can kick the bike up and everything is good. when I shut the motor off, within seconds, the fuel starts pouring out of the tube all over the ground. I have to shut the petcock to off for it to stop.

Sometimes this happens when Im riding and it kills the motor cause the fuel is going to the ground and not the motor. Every now and then when i turn the petcock to on, it will pour out.

I've been told the float inside is not seating well and to just tap the carb so the flotat "fixes" itself - this worked 1 time. Now im having issues and kep standing in puddles of fuel. What do i do? Is the carb defective?

Oh and this is not an ebay wonder carb - it's a genuine mikuni 26mm carb bought from minigunz.

X7rocks · 08-06-2008, 08:30 AM

have you tryed takeing it apart? maybe if you were to completely take it apart maybe peice by peice it will fix itself or youll find the solution

Pimpindahoes · 08-06-2008, 09:15 AM

floats are gummed up...take it apart and make sure the pluger system is all cleaned out and the float can move up and down freely.

bring it over if you cant get it fixed. ill do it for you.

Matt

HatterasCast · 08-06-2008, 09:19 AM

Matt, when's a good time to swing it down to your place?

ferris · 08-06-2008, 09:58 AM

I am having the same problem, weird, everything seems right in the carb and the float? if you fix it post the cure

HatterasCast · 08-06-2008, 11:16 AM

Quote:

Originally Posted by ferris

I am having the same problem, weird, everything seems right in the carb and the float? if you fix it post the cure

When I figure out the fix - i will post it on this thread. Anyone else ave suggestions as to what can be the cause?

Pimpindahoes · 08-06-2008, 05:54 PM

nights are good for me.

call me.

atlautomotive · 08-06-2008, 06:01 PM

the needle seat is removable and has a o-ring to seal it. this o-ring suxs on the mikuni replace it and you problem will be solved.

HatterasCast · 08-06-2008, 06:31 PM

Quote:

Originally Posted by atlautomotive

the needle seat is removable and has a o-ring to seal it. this o-ring suxs on the mikuni replace it and you problem will be solved.

Where do i get replacement o-rings?

50$Pit · 08-06-2008, 06:43 PM

more than likely its just your float level. try bending the float up a bit towards the carb body away from the bowl. should remedy the problem. but definitely clean it out really well first. carb cleaner and compressed air are your friend.

HatterasCast · 08-06-2008, 06:47 PM

So you guys think its all gunked up? Its a brand new carb - got it put on 4 weeks ago. And only has about 2-3 hours of ride time

50$Pit · 08-06-2008, 06:50 PM

Quote:

Originally Posted by HatterasCast

So you guys think its all gunked up? Its a brand new carb - got it put on 4 weeks ago. And only has about 2-3 hours of ride time

Depends on the gas you run. U4 is really bad, U4.2 is a little better but still gums. Really depends on how much you ride. If you don't run those fuel you likely just need to bend the float a bit, Matt can help you out with it if you don't feel comfortable doing it. Just don't have him place blinkers on your bike anywhere, haha.

HatterasCast · 08-06-2008, 06:57 PM

Quote:

Originally Posted by 50

Depends on the gas you run. U4 is really bad, U4.2 is a little better but still gums. Really depends on how much you ride. If you don't run those fuel you likely just need to bend the float a bit, Matt can help you out with it if you don't feel comfortable doing it. Just don't have him place blinkers on your bike anywhere, haha.

HaHaHa yeah he told me he had a little "melt down"

Pimpindahoes · 08-06-2008, 09:06 PM

Quote:

Originally Posted by HatterasCast

HaHaHa yeah he told me he had a little "melt down"

haha hey hey now..... those are factory Baja Designs locations......

but i knew it was going to be a problem. just didnt feel like moving them. lol.

now i HAVE to.

bring it over. i have a rebuild mikuni kit that i was just about to use to fix one of mine. But im actually thinking swapping to the 28mil carb anyways.

the kit is cheap and has alot of replacement parts for it. all the important stuff at least.

HatterasCast · 08-25-2008, 05:24 PM

Alright I brough it over to Matt's and he spent 3 hours working on it. Honestly, I'm not to "tech savy" and Matt explained everything he was doing step by step and schooled me on carbs but... I cant really post up the fix here in technical terms so here it is Barney Style:
Inside the carb is this gold shaft. On the shaft there were 3 very tiny holes. 2 of the holes were okay and the third one was clogged. Matt unclogged it and then showed me this flapper thing. He bent that up a little bit more (I think this is what 50$pit was refferring to). Everything else looked okay, just a few adjustments to the jetting and slapped it all back together.
The outcome: A great running carb and no more fuel spills!!! Matt did a bang up job and charged next to nothing for the parts/labor.

turbo38t · 08-25-2008, 05:38 PM

Was gonna say......bend the float tab a little but I would have bet the float needle journal was gummed. That little jet being gummed shouldn't cause it to overflow, but ethanol gas attracts water and will, in a matter of a week or two gum up the float needle either leaving it stuck closed(run out of gas in less than a lap ) or stuck open(leaving it to overflow out the tube). Dave

Pimpindahoes · 08-25-2008, 05:43 PM

you pretty nailed it in lamens terms.....

just gotta carefully go through every single port hole on the carb to make sure there isnt a clog anywhere. Then once you know you got it all cleaned out its time to inspect all the parts u just removed to ensure they are not damaged or clogged.

I found a port on the needle jet that had some debris in there and got it all cleaned out. Im sure that that was the main problem in the carb. Not being able to flow enough fuel through, thus creating pressure in the bowl and blowing it out the overflow tube.

The float level was actually perfect i just had to straigthen the flap out a lil cuz one side was bent at more of an angle than the other side. got that straight and cleaned the living hell out of the carb.

Put it all back together, primed the system with gas. kicked her over a few times and WAAAALAAAAA.

BIKE IS FIXED.

we went out to the track a few days after that so i could make sure that the jetting was 100% dialed in and i think Brian "hatterascast" officially got the "MINI BUG". Yep hes hooked.

Hope this thread can be of some help to those of you with the same problem. I know i hear about this all the time.

and we all know why it comes up again and again........nobody knows how to search and this site doesnt sticky anything worth a damn. just my .02 on that.......there are a million threads that can be cleaned up some and made a sticky to help people with tech ?'s just like this one.

but what more can you ask from a site that rakes in $2k-4K a month in advertising.

no pun intended, thats a whole nother beast.

kpcr · 08-25-2008, 05:46 PM

Call Jeff at Minigunz or just take it to him. He's not that far from you.

Pimpindahoes · 08-25-2008, 05:51 PM

Quote:

Originally Posted by kpcr

Call Jeff at Minigunz or just take it to him. He's not that far from you.

funny you sau that becuase he couldnt fix it......

but none the less Jeff is the man......we all arent perfect.

HatterasCast · 08-25-2008, 05:59 PM

Whoa! Lets not throw Jeff under the bus here - He knows his ****! He gave me a couple quick fixes over the phone that temporarily worked but when I kept getting the fuel spill problem I was getting frustrated. Matt is like a mile away from me so it just made more sense to bring it over to his house instead of driving to Walnut. especially with gas prices - My ride takes premium!

08-06-2008, 08:12 AM	#1 (permalink)
HatterasCast PM Newbie Join Date: Jul 2008 Location: Upland CA Posts: 79	Mikuni 26mm Carb Problem I have a mikuni 26mm Carb hooked up to my motor and i have some issues with it. When I turn my fuel pet cock on, I can kick the bike up and everything is good. when I shut the motor off, within seconds, the fuel starts pouring out of the tube all over the ground. I have to shut the petcock to off for it to stop. Sometimes this happens when Im riding and it kills the motor cause the fuel is going to the ground and not the motor. Every now and then when i turn the petcock to on, it will pour out. I've been told the float inside is not seating well and to just tap the carb so the flotat "fixes" itself - this worked 1 time. Now im having issues and kep standing in puddles of fuel. What do i do? Is the carb defective? Oh and this is not an ebay wonder carb - it's a genuine mikuni 26mm carb bought from minigunz.

08-06-2008, 08:30 AM	#2 (permalink)
X7rocks 2nd Gear Member Join Date: Sep 2006 Location: Maryland Posts: 859	Re: Mikuni 26mm Carb Problem have you tryed takeing it apart? maybe if you were to completely take it apart maybe peice by peice it will fix itself or youll find the solution

08-06-2008, 09:15 AM	#3 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 8,649	Re: Mikuni 26mm Carb Problem floats are gummed up...take it apart and make sure the pluger system is all cleaned out and the float can move up and down freely. bring it over if you cant get it fixed. ill do it for you. Matt

08-06-2008, 09:19 AM	#4 (permalink)
HatterasCast PM Newbie Join Date: Jul 2008 Location: Upland CA Posts: 79	Re: Mikuni 26mm Carb Problem Matt, when's a good time to swing it down to your place?

08-06-2008, 09:58 AM	#5 (permalink)
ferris PM Newbie Join Date: Dec 2005 Location: Cherry Valley IL Posts: 86	Re: Mikuni 26mm Carb Problem I am having the same problem, weird, everything seems right in the carb and the float? if you fix it post the cure

08-06-2008, 05:54 PM	#7 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 8,649	Re: Mikuni 26mm Carb Problem nights are good for me. call me.

08-06-2008, 06:01 PM	#8 (permalink)
atlautomotive PM Newbie Join Date: Sep 2005 Posts: 9	Re: Mikuni 26mm Carb Problem the needle seat is removable and has a o-ring to seal it. this o-ring suxs on the mikuni replace it and you problem will be solved.

08-06-2008, 06:43 PM	#10 (permalink)
50$Pit 3rd Gear Member Join Date: Sep 2006 Location: Riverside, CA Posts: 1,796 Awards Showcase Total Awards: 1	Re: Mikuni 26mm Carb Problem more than likely its just your float level. try bending the float up a bit towards the carb body away from the bowl. should remedy the problem. but definitely clean it out really well first. carb cleaner and compressed air are your friend.

08-06-2008, 06:47 PM	#11 (permalink)
HatterasCast PM Newbie Join Date: Jul 2008 Location: Upland CA Posts: 79	Re: Mikuni 26mm Carb Problem So you guys think its all gunked up? Its a brand new carb - got it put on 4 weeks ago. And only has about 2-3 hours of ride time

08-25-2008, 05:24 PM	#15 (permalink)
HatterasCast PM Newbie Join Date: Jul 2008 Location: Upland CA Posts: 79	Re: Mikuni 26mm Carb Problem Alright I brough it over to Matt's and he spent 3 hours working on it. Honestly, I'm not to "tech savy" and Matt explained everything he was doing step by step and schooled me on carbs but... I cant really post up the fix here in technical terms so here it is Barney Style: Inside the carb is this gold shaft. On the shaft there were 3 very tiny holes. 2 of the holes were okay and the third one was clogged. Matt unclogged it and then showed me this flapper thing. He bent that up a little bit more (I think this is what 50$pit was refferring to). Everything else looked okay, just a few adjustments to the jetting and slapped it all back together. The outcome: A great running carb and no more fuel spills!!! Matt did a bang up job and charged next to nothing for the parts/labor.

08-25-2008, 05:38 PM	#16 (permalink)
turbo38t PM Newbie Join Date: Jul 2008 Location: DirtyJerzee Posts: 49	Re: Mikuni 26mm Carb Problem Was gonna say......bend the float tab a little but I would have bet the float needle journal was gummed. That little jet being gummed shouldn't cause it to overflow, but ethanol gas attracts water and will, in a matter of a week or two gum up the float needle either leaving it stuck closed(run out of gas in less than a lap ) or stuck open(leaving it to overflow out the tube). Dave

08-25-2008, 05:43 PM	#17 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 8,649	Re: Mikuni 26mm Carb Problem you pretty nailed it in lamens terms..... just gotta carefully go through every single port hole on the carb to make sure there isnt a clog anywhere. Then once you know you got it all cleaned out its time to inspect all the parts u just removed to ensure they are not damaged or clogged. I found a port on the needle jet that had some debris in there and got it all cleaned out. Im sure that that was the main problem in the carb. Not being able to flow enough fuel through, thus creating pressure in the bowl and blowing it out the overflow tube. The float level was actually perfect i just had to straigthen the flap out a lil cuz one side was bent at more of an angle than the other side. got that straight and cleaned the living hell out of the carb. Put it all back together, primed the system with gas. kicked her over a few times and WAAAALAAAAA. BIKE IS FIXED. we went out to the track a few days after that so i could make sure that the jetting was 100% dialed in and i think Brian "hatterascast" officially got the "MINI BUG". Yep hes hooked. Hope this thread can be of some help to those of you with the same problem. I know i hear about this all the time. and we all know why it comes up again and again........nobody knows how to search and this site doesnt sticky anything worth a damn. just my .02 on that.......there are a million threads that can be cleaned up some and made a sticky to help people with tech ?'s just like this one. but what more can you ask from a site that rakes in $2k-4K a month in advertising. no pun intended, thats a whole nother beast.

08-25-2008, 05:46 PM	#18 (permalink)
kpcr PM Newbie Join Date: May 2008 Location: Lakewood, CA Posts: 23	Re: Mikuni 26mm Carb Problem Call Jeff at Minigunz or just take it to him. He's not that far from you.

08-25-2008, 05:59 PM	#20 (permalink)
HatterasCast PM Newbie Join Date: Jul 2008 Location: Upland CA Posts: 79	Re: Mikuni 26mm Carb Problem Whoa! Lets not throw Jeff under the bus here - He knows his ****! He gave me a couple quick fixes over the phone that temporarily worked but when I kept getting the fuel spill problem I was getting frustrated. Matt is like a mile away from me so it just made more sense to bring it over to his house instead of driving to Walnut. especially with gas prices - My ride takes premium!

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