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Motorbike / carb fed engine help purleassee

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14 replies to this topic

#1 OFFLINE   pauldoubleyou

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Posted 01 February 2019 - 08:04 PM

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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#2 OFFLINE   Asimo

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Posted 01 February 2019 - 08:12 PM

Remove plug and check for compression.

If compression is normal, cook sparking plug with blowlamp or gas ring and shove it in quick then try to start immediately.
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#3 OFFLINE   DodgeRover

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Posted 01 February 2019 - 08:16 PM

I would guess gassed up, get the plug red hot and try it

#4 OFFLINE   pauldoubleyou

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Posted 01 February 2019 - 08:16 PM

It blows shit out of the plughole when you turn it over if that counts

I’ll dig out the tester for tomorrow



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#5 OFFLINE   pauldoubleyou

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Posted 01 February 2019 - 08:17 PM

What does a hot plug do?


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#6 OFFLINE   DodgeRover

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Posted 01 February 2019 - 08:22 PM

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?

#7 OFFLINE   colc

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Posted 01 February 2019 - 08:39 PM

If it's manual, try tow starting it..........or a quick squirt of sniff after heating the plugs.


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#8 OFFLINE   pilninggas

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Posted 01 February 2019 - 09:02 PM

Are you sure the 'electric needle' isnt a choke solenoid?


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#9 OFFLINE   castros_bro

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Posted 01 February 2019 - 09:17 PM

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

#10 OFFLINE   busmansholiday

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Posted 01 February 2019 - 09:36 PM

Try a new plug, amazing what a difference that can make on a bike engine, not that I've fucked about for hours trying to get a Honda started in the past.....
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#11 OFFLINE   pauldoubleyou

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Posted 04 February 2019 - 05:53 PM

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

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#12 OFFLINE   colc

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Posted 04 February 2019 - 06:00 PM

Have you tried a new plug?


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#13 OFFLINE   John F

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Posted 04 February 2019 - 06:35 PM

Deffo try a new plug before playing with the carburettor. Also check the HT lead & coil to make sure you've got a nice fat spark.


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#14 OFFLINE   pauldoubleyou

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Posted 04 February 2019 - 07:15 PM

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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#15 OFFLINE   colc

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Posted 04 February 2019 - 07:27 PM

For the price of one plug, I'd stick one in anyway........


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You can tune a piano, but you can't tuna fish





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