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Post by dukeofvespas on Dec 18, 2020 19:12:03 GMT
Ok I have a px 125 , 2002 , and I was having trouble with the carb. You can start the bike no problem and ride it as far as you want, it would not tick-over very well. If you turned the tick over up it would over Rev when I was off the throttle. Then if you turn it down , the next time it would stall . once you turn it off, it would not restart. It would run on easy start but seemed to not get fuel into the carb. I stripped the carb down and checked it all for crap etc but it seemed ok , all internals were correct , reassembled the carb and replaced the fuel line ( made sure there were no kinks)
Still can’t get it to tick-over well and I’m having trouble starting it .
My question is should I just buy a new carb ? Do they come preset ?
My thinking is rule out fuel problem by completely renewing it .
What is the best carb to buy and where from ?
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Post by citydaz on Dec 18, 2020 19:55:39 GMT
My thinking is that it would be nice if you introduced yourself in the Intro section.
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Post by dukeofvespas on Dec 18, 2020 20:26:16 GMT
You are quite right, I thought I had , I have been on the forum for a while so I thought I had already. Please excuse my mistake. I’m Glen, Essex based and with some mechanical knowledge. Currently riding px 125 2002 and Honda cb500f. 2020 .
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Post by adrian on Dec 18, 2020 20:39:57 GMT
Welcome to the forum 👋👋👋
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Post by dukeofvespas on Dec 18, 2020 21:09:29 GMT
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Post by scooterg on Dec 19, 2020 18:16:24 GMT
Carbs not to expensive,
I’d replace it
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Post by ianmartin40 on Dec 29, 2020 15:36:37 GMT
They do not come pre-set so you will need to check jet sizes are correct etc if buying a direct replacement si carb, do you know any local vespa riders who may have a spare carb to try? even one from a 200 or tuned motor would do to try it first.
Ian
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Post by dukeofvespas on Jan 8, 2021 17:38:27 GMT
I fitted the new carb tonight, I got it from beedspeed. The exact right one .
I have not had chance to give it a good ride yet so I will keep you posted. I did notice though that when I rev the bike up it takes a while for the revs to die back down, this was the same before. Almost like the throttle was sticking a bit? .I know someone said they don’t come preset? But why not , you would have thought they would be set up ready to run? Otherwise loads of people would be returning them?
I also changed the spark plug. And I changed the fuel line.
Is there anything which would cause the bike not to idle right? Like a air leak getting in somewhere?
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Post by alan34 on Jan 10, 2021 11:36:05 GMT
Ok I have a px 125 , 2002 , and I was having trouble with the carb. You can start the bike no problem and ride it as far as you want, it would not tick-over very well. If you turned the tick over up it would over Rev when I was off the throttle. Then if you turn it down , the next time it would stall . once you turn it off, it would not restart. It would run on easy start but seemed to not get fuel into the carb. I stripped the carb down and checked it all for crap etc but it seemed ok , all internals were correct , reassembled the carb and replaced the fuel line ( made sure there were no kinks) Still can’t get it to tick-over well and I’m having trouble starting it . My question is should I just buy a new carb ? Do they come preset ? My thinking is rule out fuel problem by completely renewing it . What is the best carb to buy and where from ? |
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Post by adrian on Jan 10, 2021 12:17:40 GMT
Just a question, have you checked for air leaks? Just a thought
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Post by alan34 on Jan 10, 2021 16:22:20 GMT
Hello there. have you adjusted the mixture screw. not sure but I think it's one and a half to two turns out you should find it in mannual if its weak it will run fast if rich it will slow down and possibly hunt on tick over if you give it a run to get hot then check plug colour good luck let us know how you get on cheers alan.
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Post by dukeofvespas on Feb 2, 2021 17:10:58 GMT
Just a question, have you checked for air leaks? Just a thought Where should I check for air leaks ? |
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Post by scooterbooter on Feb 2, 2021 17:33:07 GMT
Sounds like an air leak. Its running lean. Especially when hot by the sounds of it. You can warm bike up and spray the mating surfaces with something like carb cleaner. If it gets sucked in there you go. If not look for clean patches on casings where hot oil or fuel is coming out. Check casings for damages.
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Post by dukeofvespas on Feb 2, 2021 18:58:50 GMT
Sounds like an air leak. Its running lean. Especially when hot by the sounds of it. You can warm bike up and spray the mating surfaces with something like carb cleaner. If it gets sucked in there you go. If not look for clean patches on casings where hot oil or fuel is coming out. Check casings for damages. Before I got it, it had the engine split apart for new gasket between the casings. Had new main bearings at the same time. I had noticed some drops of either oil or petrol from the bottom of the engine. So I need to check it’s sealed properly all around the casing? |
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Post by adrian on Feb 2, 2021 18:58:55 GMT
Sounds like an air leak. Its running lean. Especially when hot by the sounds of it. You can warm bike up and spray the mating surfaces with something like carb cleaner. If it gets sucked in there you go. If not look for clean patches on casings where hot oil or fuel is coming out. Check casings for damages. As above 👍 |
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Post by dukeofvespas on Feb 18, 2021 17:12:27 GMT
Ok , I put the bike up on my bench and had it running . I took a video . I’m still having problems with tick over and more of the revs not dropping back down when I blip the throttle . I sprayed the casings with carb cleaner, did not rev up when I did . The only thing I can think of is the air screw not set right, but it will tick over and run fine, then randomly Rev up and stay high for a min or two .
I don’t know how to put the video on here?
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Post by dukeofvespas on Feb 18, 2021 17:15:11 GMT
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Post by dukeofvespas on Feb 18, 2021 17:16:00 GMT
The fan shield is removed for inspection
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Post by adrian on Feb 18, 2021 17:39:03 GMT
You might have a small air leak, have you put new gaskets under carburetor. Base gasket?
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Post by adrian on Feb 18, 2021 17:46:40 GMT
Worn throttle slide ?
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Post by dukeofvespas on Feb 18, 2021 17:47:23 GMT
You might have a small air leak, have you put new gaskets under carburetor. Base gasket? I did not. I will, do you really think it will make that much difference ? |
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Post by dukeofvespas on Feb 18, 2021 17:48:02 GMT
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Post by adrian on Feb 18, 2021 18:37:48 GMT
Won't be that then 😔 so does this mean we are back to the air leak ?? I had a similar problem, and it was an air leak through one of the barrel studs that had been repaired badly by a previous owner 🥴 |
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Post by dukeofvespas on Feb 18, 2021 19:04:38 GMT
Won't be that then 😔 so does this mean we are back to the air leak ?? I had a similar problem, and it was an air leak through one of the barrel studs that had been repaired badly by a previous owner 🥴 How the hell did you get to the bottom of that one? |
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Post by adrian on Feb 18, 2021 21:11:26 GMT
Won't be that then 😔 so does this mean we are back to the air leak ?? I had a similar problem, and it was an air leak through one of the barrel studs that had been repaired badly by a previous owner 🥴 How the hell did you get to the bottom of that one? I stripped the engine down, thinking it was an oil seal, and found that when they put a helicoil in to repair striped thread, they drill all the way through the engine case 🙁 fixed with some chemical metal |
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Post by dukeofvespas on Feb 18, 2021 21:36:37 GMT
How the hell did you get to the bottom of that one? I stripped the engine down, thinking it was an oil seal, and found that when they put a helicoil in to repair striped thread, they drill all the way through the engine case 🙁 fixed with some chemical metal I think I will start with the gasket round the carb bottom and the one round the carb box . If this does not solve it I will strip the engine down and examine everything and replace all seals and gasket’s. And might as well replace crank shaft seals off I get that far into it. |
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Post by adrian on Feb 19, 2021 5:48:22 GMT
Hopefully it will be easy, and just carb gasket. Let us know how you get on
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Post by dukeofvespas on Feb 19, 2021 16:13:48 GMT
Hopefully it will be easy, and just carb gasket. Let us know how you get on PROBLEM SOLVED!!! I changed the carb gasket and the carb housing gasket which both looked rubbish , but while I had the carb out I checked the air mixture screw. From previous posts someone said 1 and a half turns out should be the right setting. Mine was only 1/2 turn out,I added one more full turn. Put it all back together set the tick over once it was running, job done. see video below. You can tell now that when it is reved up then let go the revs drop straight away. THANKS FOR ALL THE ADVICE GUYS |
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Post by dukeofvespas on Feb 19, 2021 16:17:32 GMT
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Post by adrian on Feb 19, 2021 16:17:58 GMT
Glad you got it sorted, and an easy fix 👍👍👍👍
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