Just picked up a wee quad for my nephew (£150) and it is a cracker.

Tonight it would start but not rev up. It was visible in the fuel filter that the petrol was not getting through. Took it off and blew through it no worries. Fuel was flowing well from the tap.

Put it back together and started but same problem. I left it on tick over for a while trying to figure it out when I noticed the glass filter was half full and the bike revved up as good as new.

I'm guessing something eventually cleared in the carb to allow more fuel through.

Am I right? And if so what is the best service solution,

All the best

James

 

to me, it sounds like fuel ain't making it to the filter fast enough. could it be float problems and not enough vacuum pulling it into there?

 

We removed the carb today for a good clean out but to be honest it all looked as good as new.

The bike has also been **** to start but always does after 5 minutes. We leave the ignition on for a couple of minutes before starting too as someone told mt the auto choke can take two minutes to cycle.

We also bench tested the auto choke today and it seems to be working although takes a while.

The filter glass never seems to have much fuel in it. What should I be looking for in the carb??

In all fairness, once the bike is running it is faultless and I've been really impressed with it. Just the starting procedure lets it down.

Any more tips??

All the best

James

 

The starting of the bike is begining to get annoying. Especially now the boy can't start it by himself.

The battery eventually flattened at the weekend so I reverted to the kick start which seemed to start the bike far better but is this just coincedence?

Why we tested the choke i.e. on the bench attached to 12 volts the plunger eventually came out by approx 5-6mm. This would mean "down" when attched in place. Is this correct? It is painfully slow but does get there in the end.

To add to it all no one in the UK can source part 650100 (manual conversion kit). And no one from the states have replied to me. We're considering the DIY approach as else where on the forum but if I **** it up we'll be stuck.

Help!!!

James

 

I don't know about the hard starting - I've never owned a two cycle.

I think you have the "auto choke" operation all wrong:

You don't really have an automatic choke. You have a "bystarter valve". When the engine is cold you need an enrichened fuel air mixture. A normal choke enrichens the fuel/air mixture by starving the engine of air (by blocking the air intake with a plate). In contrast a bystarter valve enrichens the fuel/air mixture by opening up an additional passage for fuel to flow when the engine is cold.

When your bystarter solenoid is cold the plunger is retracted. This opens up the additional fuel port and enrichens the fuel/air mixture to make starting easier. The bystarter solenoid is electrically heated - either with battery power through the ignition switch (as in your quad) or by running directly off the stator battery charge winding (as in some other quads). After about two minutes the bystarter solenoid closes off the additional fuel passage and leans out the mixture to normal for a warm engine.

So by waiting two minutes with the ignition on before attempting to start you are making the problem worse, not better. I know that you are having cold starting problems in addition to this, but I just want to make sure that you aren't adding another layer of problems. Two problems at the same time makes the problem 10 times harder to solve.

 

Ahaaaaaa!

You learn something new everyday. I did wonder about the location of the plunger as I was used to a choke closing a butterfly in the air intake.

Indeed by the time I try to start the bike it has already shut off the extra fuel.

I'll try with the auto choke disconnected then re connect once it's running.

Thank you

All the best

JAmes