Revs/Hunting

Engine not running right? see if we can help you!
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Gardiner
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Revs/Hunting

Post by Gardiner » Tue Dec 18, 2012 5:32 pm

Ok so the day has come and got her started today but there are issues.
So its a 1600 8v HIF44 SU (Breather Blocked Off) Yellow Spring and BFM Needle on Homemade Adapter with a Facet Low Pressure Fuel Pump.
Got it to start with little problems.
Once running she seems to be hunting a little and when you rev it the revs do not fall back quick enough.
Any thoughts as I am a little "Cheesed Off" today and I dont really want to give in to it !!!

Thanks in Advance

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dan_2k_uk
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Re: Revs/Hunting

Post by dan_2k_uk » Tue Dec 18, 2012 5:52 pm

As long as there isnt too much else wrong with a SU this is a good guide to getting it roughly in tune.


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ScottieJ
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Re: Revs/Hunting

Post by ScottieJ » Tue Dec 18, 2012 8:45 pm

What do you mean by breather blocked off? Can you post a pic of the set up and how it's all plumbed please.

What oil are you running in the dash pot? Does the piston rise and fall freely when you lift it without the engine running?

I'm sure we can help you get it set up and running :thumbup:
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dan_2k_uk
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Re: Revs/Hunting

Post by dan_2k_uk » Tue Dec 18, 2012 8:56 pm

Guess he means the breather on the carb itself is capped off and the one from the engine is still going to the airbox?
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Janspeed manifold, LWB Vit vented discs and calipers

Build thread -- Build photos -- HLA-Artwork
Coming soon: YJs, Trussed axles, Full float rear.

Gardiner
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Re: Revs/Hunting

Post by Gardiner » Tue Dec 18, 2012 9:06 pm

Yes thats correct well apart from i havnt plumbed in the breather from rocker box yet.
Looking on the net it could be pointing towards drawing air from the housing i.e around throttle spindle etc.
Its suggested you spray carb cleaner around body and see if revs drop as it is non combustable.

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dan_2k_uk
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Re: Revs/Hunting

Post by dan_2k_uk » Tue Dec 18, 2012 9:43 pm

yeah or maybe a leak in the adapter or its mounting.

My first adapter was leaking and it was well hard to tune.

They also get fuel leaks around the choke spindle o-ring if it hasn't been used for a while and its got dry which causes some pretty erratic behaviour.

I would get it nice and hot and give it a little bit of a tune up and if it doesn't sort it start looking at an air or fuel leak.

Dan
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Janspeed manifold, LWB Vit vented discs and calipers

Build thread -- Build photos -- HLA-Artwork
Coming soon: YJs, Trussed axles, Full float rear.

Gardiner
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Engaged 4wd low
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Re: Revs/Hunting

Post by Gardiner » Wed Dec 19, 2012 6:46 am

Yes im going to strip it down tonight and I have a timing light coming at the weekend.
What is the timing process/settings to be on this supposed to be please.

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