Lumpy tickover with PHBH

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stand63
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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

hat
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Sun Mar 29, 2020 9:49 am

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
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Sun Mar 29, 2020 9:59 am

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

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stand63
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Sun Mar 29, 2020 2:02 pm

Pilot jet is size 55. Carb is new and tank/filters are clean

gaz_powell
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Sun Mar 29, 2020 3:01 pm

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

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stand63
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Sun Mar 29, 2020 3:50 pm

Ah right. I’ll get it off and give it a good blast through. Thanks Gaz

hat
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Sun Mar 29, 2020 5:30 pm

Hows fuel flow rate into the carb?

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stand63
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Sun Mar 29, 2020 7:07 pm

Seems good. No restrictions

Norrie Bodge
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Mon Mar 30, 2020 7:55 am

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?

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stand63
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Mon Mar 30, 2020 12:24 pm

Yep during Recent rebuild

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