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Post by chops on Apr 3, 2013 13:46:02 GMT -5
Will need to double check tomoz now. Battery died so is now on charge.
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Post by chops on Apr 3, 2013 12:50:36 GMT -5
It HAS to be a carb issue because the fuel will flow freely and fast when the fuel line is disconnected from the carb and the bike is cranked over. I can see the fuel flowing thru the inline fuel filter and out into my catchment bottle,but once I put the fuel pipe back onto the carb and crank it over then no fuel is being pulled theu the carb!
So is this simply a carb issue or could other things cause this problem?
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Post by chops on Apr 3, 2013 7:45:22 GMT -5
Thanks for the praise pal but that doesn't really help. Lol.
It's just typical that I'm off work this week and all the testing equipment and tools are at work.
I'm gonna try a compression test just to rule that side of things out then if thats ok it will have to be ANOTHER new carb.
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Post by chops on Apr 3, 2013 5:11:07 GMT -5
ive fitted the new manifold spacer and i still cant get it to start!
ive now noticed that it will actualy pull the fuel thru if i disconect the fuel "in" line on the carb and crank the bike over, there s loads of fuel coming thru but when i connect that fuel line back to the carb and crank it over, there is no fuel flowing into the carb!
so i dont think its a vacuum problem or a petcock problem... surely it has to be ANOTHER carb issue?
ive had the carb off again and thoroughly cleaned it and blew compressed air thru all jets and holes but still it wont fire up!
what part of the carb should i be looking at that pulls the fuel thru or should i be also looking elswhere?
need help asap please
thanks
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Post by chops on Mar 31, 2013 11:32:32 GMT -5
thats good to know and thanks for your help and reply.
just sheer coincidence that it drove home from work perfectly ok the day before, then the morning after it wouldnt start!!
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Post by chops on Mar 31, 2013 11:22:46 GMT -5
[replyingto=hypocycle]hypocycle[/replyingto]ive now sorted the pics.
im just worried that the piece of plastic that has came off has obviosly gone into the engine somewhere, i know that it isnt much and hopefully wouldnt cause to much problem to a metal piston but just need some clarification
thanks
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Post by chops on Mar 31, 2013 10:54:13 GMT -5
After finally fixing my last problem which was a kinked fuel pipe I have now got another issue. The bike was running great an showed no sign of any issues but this morning I have come to start the bike and it won't! It will turn over and over put nothing. I've checked and cleaned the carb out,refilled with fresh fuel,checked for kinks,it's getting a good spark! So I then checked to see if the fuel was getting "sucked" thru the carb by emptying the fuel filter and then turning it over and there lies my problem. There is no vacuum!! The petcock is fine because I can manually suck on the pipe and get fuel to come thru the filter. So I've taken the vacuum manifold off and noticed that there is a rubber washer half hanging inside the intake.  Then I take the black plastic spacer out to check the rubber washer and notice that a chunk of the plastic has came off it around where the rubber sits (hard to photo)  Now.. What affect would this have on the bike? And what will have happens to the piece of plastic that is no longer there. Also what is this part called so I can purchase a replacement to see if that is the cause. Ps..the bike is a 2012 jonway italia 50cc 139qmb with 1120kms on clock. |
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Post by chops on Mar 22, 2013 17:54:05 GMT -5
im defo no expert but fuel coming out of the air inlet can only mean that your carb is goosed somewhere! are the floats set at the correct height? sounds to me like the carb is flooding.
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Post by chops on Mar 22, 2013 14:38:09 GMT -5
Check you fuel pipe. I found mine was crimped from the fuel filter to the carb which was causing fuel starvation. Was ok on short runs and not flat out as the fuel could keep up but when it needed more fuel it couldn't get it due to the pipe.
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Post by chops on Mar 22, 2013 12:24:13 GMT -5
;D ;D ;D Well guys. The little beast is running and better than it ever has. I think the problem all along has been a fuel issue. I found that when I replaced my carb a few months back it only had a 78 main jet in and the original carb had a  main jet. So it's been running lean, so put the jet back in. Also noticed that the pipe that runs from the fuel filer to the carb was very crimped and causing fuel starvation. Brought the little beast home tonight for the first time in 3 weeks and it was perfect. Really smooth,no bogging,no cut outs,idles perfectly (which it never with 78 jet in) and is 5mph faster on the flat (45mph with a 17 stone rider). Really chuffed its all running smoothly again and it has had none of the replacement parts which i ordered fitted at all. Always handy as spares though. Thanks for all your suggestions and help everyone. |
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Post by chops on Mar 22, 2013 2:44:21 GMT -5
I've done the carb tuning before when I had another problem just before Xmas.
Ended up buying a new carb!
A/f screw is currently 2 turns out so will take it from there and adjust 1/8 turn at a time.
Still baffles me why this would only start happening when I've washed the scoot!
Thanks for the help so far though guys.
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Post by chops on Mar 21, 2013 17:06:10 GMT -5
Cleaned the pilot jet and blasted the full carb out with compressed air.
I managed to take the scoot out again today on a short 5 min run but it was very boggy and even cut out when revved.
Got it back to my work place and had a quick look over it again on my lunch half hour and noticed that the short pipe from fuel filter to the carb was badly kinked and possibly causing fuel starvation.
So I cable tied it up so that it hasn't got the kink in and took it for another very quick spin,2 mins max and it was great. Only very slight bogging and no cut outs.
Also since I put the new cdi on the scoot this week it hasn't started with the electric starter,so I truer putting the old cdi back on and started it first click with it on! Strange.
My new coil,ht lead,cap and spark plug arrived today so I will fit these tomoz on my lunch break and try and take it for another spin. Hopefully I'm getting there.
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Post by chops on Mar 20, 2013 12:51:48 GMT -5
It's going but not fully sorted yet!! Still got bogging and cutting out issues.
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Post by chops on Mar 20, 2013 11:01:53 GMT -5
Installed a new bigger jet into the carb and it runs alot better. I have never been able to get over 40mph on the flat but it will now hit 45 on flat ond Off the dual going down hill. Went from a 78 to an main jet. Not sure if this has been the problem all along but it does seem to be heading in the right direction. Don't understand how when I've washed it,it would cause this problem to happen. It still hesitates and stutters when I first set off and will cut out when I come to a stand still so perhaps the carb needs tuned now. Currently have the a/f screw set at 2 turns out. |
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Post by chops on Mar 20, 2013 6:21:32 GMT -5
Brought the bike to work in a van this morn all set to take to bits and see what's going on.
I managed to ride it 500 metres,but was very boggy and sluggish. Then on the return 500 metre trip it just cuts out when any throttle at all is applied!
This has to be fuel/carb issue doesn't it?
I will investigate further on my lunch break.
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main jet. So it's been running lean, so put the