Piaggio zip doesn't start :/

thats not the quistion i asked is it. when you went to premix did you up-jet to take into account the oil in the fuel.
i know it only 100/150ml for 5,000ml of fuel but it dose make a difference. you should go up 1 to 2 size's when going to premix.

 

Ok cheers for your help I have a problem now after doing a top end rebuild it over heats like if I leave it on tick over it will go the 120 on the clock within 10 mins.
I have tryed beelding the head but still no luck :/
You got any ideas why it would be over heating mate

 

Crank seals.
Air leek around the inlet or exhaust.
Did you remove all the old seals and fit new on the head.
At idle the air/fuel mix screw may be set wrong.
Pilot jet may be too small.
Also how much oil are you using pre 5L of fuel.

if you have not changed anthing and it was working fine before i would remove and re-seat the cylinder with new seal/silent i liquid silent is always a good thing to use it helps you get a 100% seal


but can i ask why you letting the bike idle for upto 10 mins. there not realy made to run at idle for too long.

 

Had a new crack fitted not long again so don't think it is that

Yer I fitted a full new gasket set when I did the top end rebuild
It was working fine befor that so I must of done something wrong when putting it back together
I put 30ml to every 1l of fuel
I don't mean I let it tick over for a whole 10 mins I rode it around the block and it was over heating so got back home turned it off to let it cool down then started it again and after about 2 mins it was getting really hot so I turned it off

 

bigger main jet.

 

What do you think that will sort the over heating out?

 

yes if your running lean it will over heat very fast. you need to buy a jet pack and work you way from to top down untill the bike run ok. with too big a jet it will backfire.

 

Ok mate nice one just took the carb off and there is a big crank in the manifold rubber could that be the Probelm of it over heating

 

yes. that would do it too

 

Ok nice one ill keep you posted on how I get on pal if it ant that am gunna get a jet pack

 

Got a new manifold and still over heats lol if it was running rich would that make it over heat or not scooter-noob??

 

no rich would make it lose all power when you rev, it also make it run cooler then stock.
not a lot of ppl know but the fuel system is part of a scooter cooling system.

have a look at the crank seals, with the manifold been damaged and the bike over heating it may have damaged them. look for oil marks around the seals. but if all fails bigger jet.

thanks to look for when jetting.
rich = jet too big = back fire when you rev = cold engine
lean = jet too small = total power loss when you rev = engine hot.

 

Ok guess its not that what is coursing it to over heat, what so running rich would make the engine run cooler then stock?
Yer ill have a look at the crank in the morning mate
What size jet would you say with a standard air box I know it's a trail game with jets you have to try a few sizes but you might have some idea lol
Cheers

 

realy have no idea my nrg mid race with a 17.5 was 98 jet, my slider mid race with 17.5 was 122 jet.

the 17.5mm carb uses big jets for some reason. have a loot at what jet you have now and just make a jump up say 10. then more if needed. and so no

 

Yer same her there are loads of sizes on the mark to chose from
I have a 17.5 carb with a 80 main jet in ATM
With a standard air filter and malossi form inside

 

try a 90

 

Was gunna go for a 100 but ill start with a 90 and go up mate

 

hay start where ever you think is right. but as the bike dose run, it just get hot your not too fare away. if you needed a big jump it would be at the stage where when you rev the bike just bogs down and has no power

 

Ill get a few maybe a box full lol yer it's starts fine only rode it once as started to over heat and wanted to run the new piston
But what I don't get as befor the rebuild it did not over heat at all and it had a 80 main jet in then :/

 

is the air box fitted right. did you modify anything. is the exhaust fitted right. if the crank seal are not fitted right they can we work out in few min's. what did you seal the crank cases with.

if soulds like a mistake as been made. is there any vibration from the crank