Won’t cold start/choke.
Posted: Sun Aug 09, 2020 11:05 pm
Hi all.
I’ve read so many similar(ish) posts but couldn’t find exactly this. I have tried many things I’ve read on here and it’s been a great help. But I still have a problem starting the old girl from cold.
I have a S3 TV175. I’ve slowly been making it good, from a complete bag of spanners it was when I bought it. As bad as it was, after a new ignition kit, and carb, the engine has been faultless. My set up is as follows.
GP200 engine. Ancillotti 42mm clubman exhaust. Jetex 22mm. 45pilot/118main/50choke. AF RAYSPEED complete electronic ignition kit with lightened flywheel (1.4kg). Original air box and filter etc.
After a couple of years off the road due to house moves and a lot of babies, I’ve set about getting the old girl out and about again. Once I had done the usual, fuel and carb clean and new petrol. Little bit of maint, I kicked her over and after 4 years, fired up 2nd kick like always. I went for a ride and she didn’t miss a beat for 20odd miles. Then ‘BANG’ almighty backfire and I just got home with it banging and sluggish sounding awful. Assumed timing. Set about looking. All ok. Re timed anyway. Starts fine. As soon as I ride out, within 5 mins ‘BANG’ and limp home. Bogging down and awful. I can’t quite pin it down, poss Stator warming and failing, poss CDI. I don’t know. So I do a bit of research and end up talking with Anthony at Scootronics. And I purchase a new AC stator and high powered CDI. Throw it all together and.... nothing. Won’t start. Check everything. Won’t start. But getting a great spark. I bump start and she fires up. Ride out and going like a dream. A little bit boggy sounding at low revs low speed, say 1/4 throttle. But otherwise great. Cruises at 55, got 70 on a slight downhill. Sweet as a nut. Stop, and kick her over. Fires up a beauty. Next day. Will not start from cold. At all. After dissecting the forums I’m convinced it’s a choke issue. I strip and clean all carb, jets, plunger. The lot. Nothing. But if I pull the choke plunger completely out of the carb, she fires up. No probs. And ticks over. Get her warm, turn off and refit choke so I can effectively turn it off, and the scoot runs like a dream on a good ride out. As good as ever has. It cold next day. Nothing. Won’t start.
Even if I strip the choke plunger out and get the engine running, just so much as offering the plunger to the hole, and instant stall.
I’ve got the old carb and have swapped plungers, jets. Cleaned and cleaned again. Placed hand over carb when kicking over. She will not start cold unless the choke plunger is completely pulled out. I just don’t get it.
I timed initially to 17’BTDC. Now I’m at 19’BTDC.
What gets me is how great my Lammy goes and runs. I ride alone. I don’t know anyone to compare anything to, and it’s my first Lambretta.
Sorry for the long post, but wanted to get all the info in to save you guys time on the details.
Thank you.
I’ve read so many similar(ish) posts but couldn’t find exactly this. I have tried many things I’ve read on here and it’s been a great help. But I still have a problem starting the old girl from cold.
I have a S3 TV175. I’ve slowly been making it good, from a complete bag of spanners it was when I bought it. As bad as it was, after a new ignition kit, and carb, the engine has been faultless. My set up is as follows.
GP200 engine. Ancillotti 42mm clubman exhaust. Jetex 22mm. 45pilot/118main/50choke. AF RAYSPEED complete electronic ignition kit with lightened flywheel (1.4kg). Original air box and filter etc.
After a couple of years off the road due to house moves and a lot of babies, I’ve set about getting the old girl out and about again. Once I had done the usual, fuel and carb clean and new petrol. Little bit of maint, I kicked her over and after 4 years, fired up 2nd kick like always. I went for a ride and she didn’t miss a beat for 20odd miles. Then ‘BANG’ almighty backfire and I just got home with it banging and sluggish sounding awful. Assumed timing. Set about looking. All ok. Re timed anyway. Starts fine. As soon as I ride out, within 5 mins ‘BANG’ and limp home. Bogging down and awful. I can’t quite pin it down, poss Stator warming and failing, poss CDI. I don’t know. So I do a bit of research and end up talking with Anthony at Scootronics. And I purchase a new AC stator and high powered CDI. Throw it all together and.... nothing. Won’t start. Check everything. Won’t start. But getting a great spark. I bump start and she fires up. Ride out and going like a dream. A little bit boggy sounding at low revs low speed, say 1/4 throttle. But otherwise great. Cruises at 55, got 70 on a slight downhill. Sweet as a nut. Stop, and kick her over. Fires up a beauty. Next day. Will not start from cold. At all. After dissecting the forums I’m convinced it’s a choke issue. I strip and clean all carb, jets, plunger. The lot. Nothing. But if I pull the choke plunger completely out of the carb, she fires up. No probs. And ticks over. Get her warm, turn off and refit choke so I can effectively turn it off, and the scoot runs like a dream on a good ride out. As good as ever has. It cold next day. Nothing. Won’t start.
Even if I strip the choke plunger out and get the engine running, just so much as offering the plunger to the hole, and instant stall.
I’ve got the old carb and have swapped plungers, jets. Cleaned and cleaned again. Placed hand over carb when kicking over. She will not start cold unless the choke plunger is completely pulled out. I just don’t get it.
I timed initially to 17’BTDC. Now I’m at 19’BTDC.
What gets me is how great my Lammy goes and runs. I ride alone. I don’t know anyone to compare anything to, and it’s my first Lambretta.
Sorry for the long post, but wanted to get all the info in to save you guys time on the details.
Thank you.