A most curious problem

So I just got this sweet maxi from King pat. It starts first kick, and rules. It has a 14 carb, a 72 jet, a proma perf exhaust, a couple holes in the airbox, a 22 cylinder, great pick up, enjoyable top end. But, (of course) every once and a while, after a day of riding, towards the end of a long ride going full throttle I will start to bog out, so i chill on the throttle, ill stop, idle, and then throttle again only to experience the same problem soon after, eventually it cuts off and then wont start until the next day, when first kick and i'm off. the carb is clean. there have been somewhat dramatic changes in temperature here lately, this problem is only experienced at night. i dont know dudes! help!

Re: A most curious problem

Sounds like your experiencing a soft seize. The motor will turn over. It just won't start. I had the same problem on one of my Puchs. I knew the motor was running a little lean. But I just didn't have the jet I needed. My nephew was down here so I let him ride it anyway. Ran great for a couple miles and then just bogged to a stop. Seemed to turn over fine, but wouldn't start. Let it cool down for a while. And it was good to go. Took the motor apart because I needed the head for my Polini motor. You could see the scuff marks on the piston. Even though it still ran good when disassembled.

Try to go up 2 jet sizes and see what that gets you.

Re: A most curious problem

You my want to try a new set of points and condensers if your bike is old enough

Re: A most curious problem

Jason Luther /

is your carb getting enough gas? doesnt sound like a soft seize, how long do you ride at full throttle before it does this?

Re: A most curious problem

steveintoronto /

could be a bad gasket, no? my old honda used to do the same thing until i changed the head gasket. when the bike gets warm the parts expand a little, and if the seal's suspect at all you can start to lose compression a bit.

Re: A most curious problem

I had the same problem and for me it was because i had drilled holes in the airbox i covered them up and it solved it , but then mystersly the problem has returned to my bike , id also check your spark plug i found mine was f*****

Re: A most curious problem

steveintoronto /

maybe you're creating a fuel-starvation situation somehow once the bike's hot? have you tried turning the fuel/air mixture screw a touch so you run a bit richer?

just an (after-)thought

Re: A most curious problem

steveintoronto /

...if that's the problem, alex gets an assist!

Re: A most curious problem

Answer to the million dollar question: OUT OF GAS

Re: A most curious problem

LMAO!!

Re: A most curious problem

steveintoronto /

problem indeed

Re: A most curious problem

It does not sound like a soft sieze to me as it idles fine.

It sounds like you are not getting enough fuel flow to the float bowl to keep up with your high speed running.

Have you checked your fuel filters and the filter screen on the fuel tap up inside the fuel tank?

And adjusting the fuel mixture screw only effects idle. Does not do anything at fuel throttle.

Re: A most curious problem

the fact that it doesn't start at night is only coincidence. try removing the air cleaner and muffler for diagnosis purposes.

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