carb advice

Hi all,

My bike starts nicely with the choke. After about 2mins running, the
revs fall and it stalls.

If you ride the bike with choke for a couple of minutes, then turn the
choke off, the bike idles happily.

Any ideas what's going on?

Do I just need to adjust idle speed and pilot jets with the engine warm?

It's a Kwak GPz305 (twin cylinder air cooled 2-stroke)

Thanks for your help,

Adam

 

STAY AWAY FROM THE PILOT JETS

Nice bike, I commuted one for 3 years, although I had the 4 stroke
version. During all that time it simply would not run at all well for
the first two minutes unless on full choke.


Word of advice, change the belt immediately you find a nick as it will
break shortly after.

 

<sniffs bait>
<swims off>

 

There's your problem right there. Two of the strokes have fallen off.
You will have to retrace your last journey, looking in the ditches and
hedges in case they bounced when they hit the road.

 

"Come behind this hedge and we'll look for your strokes together, sonny"

 

Choke still out or what?

Whell, I don't know much that particular bike, but it sounds quite
reasonable to me. Riding it, in traffic at least, will generally warm
it up faster than just idling it.

Yes, never play with the mixture unless it's /fully/ warmed up. Two
minutes' idling isn't 'fully warm'.

But...

If it idles fine when warm then it's probably OK; don't mess with the
jets. If starting from cold or from hot is hard *then* look at the
low-speed jets and the [choke | mixture enricher].

ITYM 4-stroke.

 

It's a Kwak GPz305 (twin cylinder air cooled 2-stroke)

Oh dear what a muppet. Of course I meant 4-stroke.