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pauldoubleyou

Motorbike / carb fed engine help purleassee

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So I’ve just spent the best part of two hours trying to get a farmer mates quad to run. I got pinged as ‘that car bloke’ so went up with tools.

 

I’m not hot on carbs but it’s essentially a single cylinder 400cc bike engine on an arctic fox atv. Every carb I’ve had on a bike I’ve just replaced it.

 

It has spark, tested by pulling the plug and sitting it on the casing

 

It has fuel .. the plug is wet and smells of fuel when you pull it. Pulled the carb off and the reservoir was full and seems to be feeding a little too much fuel if anything.

 

Good battery, turns over nice and fast

 

It has air, new air filter.

 

Killswitch not engaged.

 

Seems to have some kind of electric needle fed type idle system, but still doesn’t start with WOT

 

No obvious choke

 

Am I missing something stupid here or could we be looking at timing? It ran, it was minus 7, next day it didn’t run. Air cooled with an oil cooler, relatively new quad, nothing visually fucked.

 

 

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If it's blowing fuel out the plug hole it's definitely gassed up.

Leave the plug out over night to give it a chance to dry out.

 

With the plug really hot it has a better chance of firing before getting soaked again.

 

Possibly the choke isn't working well enough to start in the coldest temperatures?

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Remove plug n take off air filter from carb then whizz engine over wiv throttle wide open for 20+ sec. Replace plug n HT, squert Ezaystart (other hallucinations available just send cash) in venturi and finger the appropriate

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Right so thanks to the above, I managed to get it running.. for a bit. Hot spark plug worked.

 

Now again it won’t start after that initial run.

 

So can we say it’s a carb issue that it’s flooding?

 

Offending shite

 

6dfd203ecdddff144bd00817dde9ed5b.jpg

 

 

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I tried it a few more times and it seems to run fine. Could be as it’s now hot but I’ll see. Seems to be running like shit as I think someone’s been playing with the idle screw

 

Gonna go back to it tomorrow once it’s stone cold. If it starts then sorted, if not I’ll swap the plug

 

 

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