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Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 9:17 am
by stand63
Hi folks
Running a new build Scootopia 186 with a 28phbh with a tea strainer filter and AF clubman. Runs fine, starts fine and plug colour fine. I’ve adjusted the mix screw in and out and settled on the best spot for pick up and returning to tickover but it still remains very lumpy. It’s fine at start up with the choke on. Any ideas most appreciated
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 9:49 am
by hat
If its ‘searching’ on tickover it might be short of fuel. Be worth putting in a bigger float valve and/ or pilot jet. What size are these now?
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 9:59 am
by gaz_powell
Check pilot jet and pilot route is not blocked.....thoroughly clean the whole carb through.
Also check your tank and petrol filter aren't full of crap
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 2:02 pm
by stand63
Pilot jet is size 55. Carb is new and tank/filters are clean
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 3:01 pm
by gaz_powell
55 defo big enough pilot.
Don't bank on the carb been clean from new - when I had this it was crap in the carb and it took a couple of cleans. Tank and filter was clean
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 3:50 pm
by stand63
Ah right. I’ll get it off and give it a good blast through. Thanks Gaz
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 5:30 pm
by hat
Hows fuel flow rate into the carb?
Re: Lumpy tickover with PHBH
Posted: Sun Mar 29, 2020 7:07 pm
by stand63
Seems good. No restrictions
Re: Lumpy tickover with PHBH
Posted: Mon Mar 30, 2020 7:55 am
by Norrie Bodge
stand63 wrote: ↑Sun Mar 29, 2020 9:17 am
Hi folks
Running a new build Scootopia 186 with a 28phbh with a tea strainer filter and AF clubman. Runs fine, starts fine and plug colour fine. I’ve adjusted the mix screw in and out and settled on the best spot for pick up and returning to tickover but it still remains very lumpy. It’s fine at start up with the choke on. Any ideas most appreciated
Has engine had a leak down test?
Re: Lumpy tickover with PHBH
Posted: Mon Mar 30, 2020 12:24 pm
by stand63
Yep during Recent rebuild