Scooterotica

I have tried to get my Casa 210 to run OK with a jetex carb,but doing plug chops at different throttle openings gives me different colours on the plug.At tick over and just above the plug is to rich with a very deep brown colour,if I open the throttle a bit more the engine 4 strokes,the plug colour seems to get lighter as you open the throttle and at WOT the plug is almost white,I'm running through a drilled airbox with a KBA clubman.The jets are-main 132,atomizer is a 5899-2 drilled to 2mm up the middle,pilot 45,I tried a 48 pilot but it 4 stroked really badly.The carb has a 200 slide.Should I chuck the jetex away and go for another type of carb,MB do a PHBL 25 carb kit that sounds ideal because I would like to run it through the airbox.Any info would be gratefully received.

Paul.

HxPaul wrote:I have tried to get my Casa 210 to run OK with a jetex carb,but doing plug chops at different throttle openings gives me different colours on the plug.At tick over and just above the plug is to rich with a very deep brown colour,if I open the throttle a bit more the engine 4 strokes,the plug colour seems to get lighter as you open the throttle and at WOT the plug is almost white,I'm running through a drilled airbox with a KBA clubman.The jets are-main 132,atomizer is a 5899-2 drilled to 2mm up the middle,pilot 45,I tried a 48 pilot but it 4 stroked really badly.The carb has a 200 slide.Should I chuck the jetex away and go for another type of carb,MB do a PHBL 25 carb kit that sounds ideal because I would like to run it through the airbox.Any info would be gratefully received.

Paul.

I had the same on a 26mm reamed Jetex, changed the atomiser back to non drilled and it was fine. A 25mm phbl will be fine however, especially as you have a drilled airbox already.

Rich'

Try a 145 main jet if it's still lean make a 150 yourself and see if that is any good. Mine ran great the only issue I had was with hot starting.

Best of luck, a 25 mil is a good option just a tad more expensive than the Jetex

Hope you get it sorted.

cgt75b wrote:Try a 145 main jet if it's still lean make a 150 yourself and see if that is any good. Mine ran great the only issue I had was with hot starting.

Best of luck, a 25 mil is a good option just a tad more expensive than the Jetex

Hope you get it sorted.

Wouldn't have thought you would need to go anywhere near Main jets that big but I am willing to be proved wrong. One thought, however is, have you definitely got the 200 slide in your Jetex?

Rich'

ktmh5,yes,200 slide,flat both sides.cgt75b,mine runs great,it's just the plug colour that doesn't look good.
Paul

Im running a 135 main in a jettex on a standardish stg4 with a pm copy pipe atomiser was modified to run rich in the mid range pulls 67 on gps