Only runs with choke on.

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10 inch Terror
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ebay user ID: peter-fred-welch
Main scooter: Lambretta LI Imola 185
Location: Farnborough Hampshire
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Fri Oct 06, 2017 7:55 am

Hi all, after being off the road for a while I’ve spent the last few days sorting out my RB250. I’ve replaced the rear hub bearing and seal and checked the 5 speed box and clutch. Other than that I’ve not touched anything else enginewise. It started within 15 kicks but revs quite high and will only run with the choke on. As soon as the the choke is off it dies and will only restart with the it on again. Can anyone advise please as I have an MOT booked for this afternoon. Thanks in advance Pete.

GeorgeS
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Main scooter: 1961 Series II Granturismo 240
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Fri Oct 06, 2017 8:05 am

Sounds very much like an air leak to me, have a look around at the carb manifold, mounting rubbers and exhaust manifold. Hopefully it's one of those things rather than a crank seal.

Maybe also a blocked jet from standing?

10 inch Terror
registered user
Posts: 1493
Joined: Tue Jun 29, 2010 9:17 pm
Xbox live gamer tag: I'm 46 not 6!
Playstation gamer tag: PLEASE!
ebay user ID: peter-fred-welch
Main scooter: Lambretta LI Imola 185
Location: Farnborough Hampshire
Contact:

Fri Oct 06, 2017 8:19 am

Ok cheers, I’ll whip the carb off 1st. Then check for leaks. It was running perfectly prior to going off the road. Thanks Pete.

10 inch Terror
registered user
Posts: 1493
Joined: Tue Jun 29, 2010 9:17 pm
Xbox live gamer tag: I'm 46 not 6!
Playstation gamer tag: PLEASE!
ebay user ID: peter-fred-welch
Main scooter: Lambretta LI Imola 185
Location: Farnborough Hampshire
Contact:

Fri Oct 06, 2017 12:25 pm

I whipped the carb off and it was gummed up. A quick clean and it’s all good again. I love a happy ending.

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