regret to install a mukuni carburator :(

yewjunyan

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yewjunyan

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Jun 19, 2006
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dear sifu, i left my car 5 days due to balik kampung to visit gandpa...today morning i start the engine, the engine starts, but stall within 2 second..i start the second time then it starts and run well...issit due to unsufficient fuel flow? it nv happen bfr while i using stock carb...this carb makes my engine not easy to start...expecially when hot...need to crank more compare to stock one..the tunning all correct..issit due to inssuficient fuel or pressure supply by eom pump ?
 

Darth

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Darth

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hurmm...you using MIKUNI 2 barrel ar?....the secondary open by vaccum meh?....okeh....here wat i know.....since the secondary is operated by vaccum and not mechanical likes weber dgv.....the secondary open on 3K rpm......you need to check the diaphram on the linkage to secondary is working or not..........try to make you car idling....open the air filter....and revv the throttle.....see closely wether the diaphram working to pull the linkage on secondary plate....and if there any fuel came out from the secondary barrel......or.....'suck' the end of the hose on diaphram by your mouth to see wether the diaphram is working........

the standard oem carb you using is variable venturi carburetor.......using piston...same design like SU carb.......only it aisin n downdraft.........


your mikuni autochoke working or not??if not that the answers for hard-start....
how to check?
-see on top of the carb....got plate overthere..that is autochoke plate....is it fully open wide or closed??(dont start the engine and see it when engine is cool)
 

yewjunyan

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yewjunyan

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thanks ya Darth...i have check it...the secondary barrer is working:)...and the choke do close while cold...:)...just the forman not sure weather the fuel supply hose fix correctly anot le..
 

yewjunyan

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yewjunyan

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after few days of hard driving...the performance since improve abit le...thanks for every command given by sifus:)....today i met uncle fred, surprise to hear that this carb is same model as 4g91 carb version...:)....guys i need ur opinion...let say i wish to increase pick up, can i give the maximum timing advance? like 13 degree?
 

yewjunyan

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yewjunyan

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ic..my engine will knock abit while i press the gas pedal...so i think i should back aff abit timing lo...sifu, how come the carb's peformance will improve after being hard driving for several time le? erm, do u think stock proton carb performance is better than twin barrel carb?
 

yewjunyan

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yewjunyan

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hey sifus.... issit ok to pour those complete fuel system cleaner to my fuel tank pior to clean my carburator?coz this piece of shit has been sleeping for few years while imported from japan.....i guess there's some dirty partical inside it....guys would u agree if i do so?
 

fstr

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fstr

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ur timing is edi in advance kao kao, so there is no more space to advance anymore.

ur carb is in good condition and everything is installed correctly i dont think there is much u can do, whats only bothering you is your own mindset. you cant seem to get rid of ur habit of using an ori carb with a mikuni, just be happy with wat u have.

if u still insist that d power is "so so" only then change back to ori aisan carb.
 

yewjunyan

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yewjunyan

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Jun 19, 2006
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thanks uncle fred's advice....i appreciate wat i hav....just dat it jerks sometimes which make me abit worry bout it....today the forman has change the fuel hose setup for me...hope it helps abit...
 

xtorm

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xtorm

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tiu lei laaa.....wahahahahahaha

no more twin carblah u....last time i drive tat car an tiong 9gti 1...hehehehe