Scooter cutting out

DaveD

I have a 49cc Suzuki Katana. Everything is fine when cold, it starts and idles fine. However when warm it cuts out when i stop at lights etc. I have to keep the throttle slightly open to keep it from cutting out.

Any ideas ? I've replaced the spark plug and battery recently.

Pigeon Reaper

are you leaving the choke on?

DaveD

Thought it was an automatic choke on them ?

Luckycharm

Do you come downhill in the mornings?
I used to have a Katana could start it fine in the winter when it got cold and I was coming downhill when I stopped and did not keep revving it always cut out. Sometimes took a few mins to get going again- bike shop told me it was something to do with the cold air going into the engine.

DaveD

Nope, don't go downhill.

It only happens when the bike is warm

Tigger

DaveD wrote: »

Nope, don't go downhill.

It only happens when the bike is warm

carb or injection
if its carb then its the idle screw

i'll get some diagrams

Tigger

rbd wrote: »

carb or injection
if its carb then its the idle screw

i'll get some diagrams

take some photos of the carb anfd i'll show you what to do

DaveD

Thanks rbd, found the idle screw and have adjusted it.

Have one more question, the bike seems to be using quite a bit of coolant. Topped up the bottle yesterday after noticing it was practically empty and today after checking it its gone down to the minimum mark. Can't see any signs of a leak ??

Tigger

DaveD wrote: »

Thanks rbd, found the idle screw and have adjusted it.

Have one more question, the bike seems to be using quite a bit of coolant. Topped up the bottle yesterday after noticing it was practically empty and today after checking it its gone down to the minimum mark. Can't see any signs of a leak ??

top it back to max and keep an eye on it keep me posted
in the meantime

when did you last check it?
is there steam comming out of the exhaust?
did a garage have it recently
has it sat up for a few days recently
how often do you drive it
did you make sure to use anti freeze

DaveD

rbd wrote: »

top it back to max and keep an eye on it keep me posted
in the meantime

when did you last check it?
is there steam comming out of the exhaust?
did a garage have it recently
has it sat up for a few days recently
how often do you drive it
did you make sure to use anti freeze

Last checked it at the weekend, topped it up and the resevoir bottle was empty within one drive.

no steam.

No garage had it recently.

I drive it Mon-Fri, 24kms each day, dont drive it at the weekend.

Yes, using proper coolant.

The coolant is coming out the overflow tube at the top of the bottle. Pressure seems to be building up and forcing the coolant out. The bottle has a lot of gunk in it.

Tigger

DaveD wrote: »

Last checked it at the weekend, topped it up and the resevoir bottle was empty within one drive.

no steam.

No garage had it recently.

I drive it Mon-Fri, 24kms each day, dont drive it at the weekend.

Yes, using proper coolant.

The coolant is coming out the overflow tube at the top of the bottle. Pressure seems to be building up and forcing the coolant out. The bottle has a lot of gunk in it.

does the coolant move when you rev her?

DaveD

Yes, it comes out the overflow tube.

I've brought the bike to Paul Ryans, he reckons its the head gasket.

Tigger

DaveD wrote: »

Yes, it comes out the overflow tube.

I've brought the bike to Paul Ryans, he reckons its the head gasket.

it is

if the coolant is moved by reving thats preessure from the cylinder escaping into the water jacket
then blowing out the tube

how much, how long?

DaveD

Max €150 i'm told depending how much damage done. Hope to have it back Tuesday too.

Cheers for all the help rbd

Tigger

DaveD wrote: »

Max €150 i'm told depending how much damage done. Hope to have it back Tuesday too.

Cheers for all the help rbd

how did it work out?

DaveD

Head Gasket, €150. Bike is running sweet now