Lumpy tickover with PHBH

FREE tuning and maintenance info, plus links to our original tuning pages that started it all off.
User avatar
stand63
registered user
Posts: 34
Joined: Tue Aug 13, 2013 7:18 pm
Main scooter: Lambretta / Eibar S2
Contact:

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
hat
registered user
Posts: 59
Joined: Fri Jul 05, 2013 7:19 pm
Main scooter: SX150/ Mugello 186
Contact:

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?
gaz_powell
registered user
Posts: 1208
Joined: Sat Mar 28, 2009 1:10 pm
Location: hartlepool
Contact:

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
User avatar
stand63
registered user
Posts: 34
Joined: Tue Aug 13, 2013 7:18 pm
Main scooter: Lambretta / Eibar S2
Contact:

Pilot jet is size 55. Carb is new and tank/filters are clean
gaz_powell
registered user
Posts: 1208
Joined: Sat Mar 28, 2009 1:10 pm
Location: hartlepool
Contact:

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
User avatar
stand63
registered user
Posts: 34
Joined: Tue Aug 13, 2013 7:18 pm
Main scooter: Lambretta / Eibar S2
Contact:

Ah right. I’ll get it off and give it a good blast through. Thanks Gaz
hat
registered user
Posts: 59
Joined: Fri Jul 05, 2013 7:19 pm
Main scooter: SX150/ Mugello 186
Contact:

Hows fuel flow rate into the carb?
User avatar
stand63
registered user
Posts: 34
Joined: Tue Aug 13, 2013 7:18 pm
Main scooter: Lambretta / Eibar S2
Contact:

Seems good. No restrictions
Norrie Bodge
registered user
Posts: 450
Joined: Thu Oct 25, 2012 2:49 am
Main scooter: GP-1971-Ts230/S2-1960-Ts230
Contact:

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?
User avatar
stand63
registered user
Posts: 34
Joined: Tue Aug 13, 2013 7:18 pm
Main scooter: Lambretta / Eibar S2
Contact:

Yep during Recent rebuild
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: No registered users and 9 guests