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Post by grieve on Jul 20, 2015 5:42:39 GMT -5
Ok so long story short - I checked my work on the valves, they were fine.
I then rechecked that the carb, jets and everythings else in there was clean and put back together properly - it all appeared to be.
Then when everything was reassembled I couldnt start the bike at all.
Fuel to the carby was good, fuel was IN the carb too.
Checked for spark - consistent but seemed weaker than it should be so I ordered in a new CDI and coil. A few days and $15 later that arrived and I put it in. Strong spark but still not start.
Even with a spray of starter fluid I was still only getting a coupke of revs out of the engine before it died so I decided to order a new carb.
That arrived today and Ive just put it in and started the scooter and had it running nicely.
When setting the carb up I turned the mixture screw all the way in and then 2 1/2 360 degree turns back out.
Took it for a quick ride and top speed seems to be about 2/3 of what it used to be and when I wind back the throttle the revs are slow to drop. Otherwise it seems responsive and has good initial acceleration.
Do you guys think I just need to adjust the mixture more? From memory does revs being slow to drop mean its running lean?
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Post by grieve on Jul 5, 2015 14:34:28 GMT -5
Thanks for the replies
99% sure I had the valves right, but I will recheck.
The bolt that came off- the threaded part was fixed to part of the engine, the nut was the only movable part :-(
I still have the scooter in pieces so I'll recheck the valves after work and report back. I feel like I've (over) reached the limits of my mechanical abilities and I'm ready to hand it over to a mechanic.
Thanks again for the help
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Post by grieve on Jul 4, 2015 2:55:56 GMT -5
Looks like my picture posting attempt wasnt successful. I used [IMG tags and linked to my dropbox account...?
I'm posting this from my phone so the other options like Quick reply and the picture button dont show up on the mobile version of the site.
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Post by grieve on Jul 3, 2015 5:51:00 GMT -5
Ok here's the thing I broke circled on the left, and one end of the cracked hose circled on the right.  Can someone shed some light on what these are for, and whether they're related to the problems I'm experiencing? Thanks and regards, Cameron |
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Post by grieve on Jul 3, 2015 0:27:23 GMT -5
Ok so my feeler gauge arrived this morning and I got work started. Things did not go according to plan...
The valve adjustment was fairly straight forward. They were was too tight. Loosened them out to 0.05mm, tightened the nuts and rechecked. Still all good so started reassembly. This is where things started going downhill.
Got the valve cover back on ok, but while tightening the nuts on the U-shaped tube thing that sits over the valve cover, the outside one just sheared the bolt clean off flush with the engine. Not good... I don't know what this thing is or does but it can't be good.
After that I reattached the battery, started it up and let it run for 10 minutes. Pretty much as soon as I got on and tried to ride, the old problem resurfaced. Bogging down, need full throttle to keep from stalling, no power to wheel.
So in I go to the carby, follow alleyoop's tuning instructions. Some changes to idle speed while adjusting A/F mix screw but seemingly minimal so I decide to pull the carby and clean it. Pretty much every screw I removed fell down and got magnetically stuck to the most inaccessible spot on the starter motor.
The smaller brass jet (?) in the middle of the carb was very slightly blocked. I cleaned it with a single strand of wire out of some electrical cable an put it all back together. Tried readjusting, no change from previous results.
Also the hose that runs from the valve cover back to some little box near the back wheel is cracked at both ends. I taped it up. What does this hose do? And could it be causing my problems?
Basically everything is exactly the same as before except I sheared the bolt off something and I am sorely tempted to set fire to the scooter.
It still runs reasonably well when cold but after 5 or 10 minutes its all over. It blows a bit of black smoke when it's misbehaving, none when running well.
Any thoughts? Could it be the rings or something? And what is the mystery part I broke?
I'll go and look up how to post pictures...
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Post by grieve on Jun 30, 2015 4:04:13 GMT -5
8000 miles - that's a lot of riding! I'm lucky to live fairly close to work. As the weather cools down here it takes me longer to put on a jacket and gloves than it does than it does to ride there.
I'll keep updating this thread as I get the work done on the bike. I'm really hoping my feeler gauge arrives tomorrow so I can get started
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Post by grieve on Jun 30, 2015 1:09:12 GMT -5
Yeah its probably due for a change. When I got it, it had 600km on the clock. I think it was around the 1000km (620miles) mark when I did the oil change and it has around 2200km (1365miles) on it now.
It was easy enough to do so I might as well change it while I've got my hands dirty ☺
Thanks for the help guys
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Post by grieve on Jun 29, 2015 21:02:53 GMT -5
Thanks for the reply.
You're right I have only done the work I mentioned in the first post, plus did a full oil change maybe 12 months ago. No other tinkering, I'm usually a bit scared I'm going to wreck something and won't be able to fix it.
As soon as my feeler gauge gets here, I'll get into it.
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Greetings
by: grieve - Jun 29, 2015 20:43:30 GMT -5
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Post by grieve on Jun 29, 2015 20:43:30 GMT -5
Thanks dmartin95,
I have just started a new thread over on the 50 to 200cc aircooled garage section outlining my scooter woes. Basically it is bogging down and stalling only when hot.
Thanks for the advice, I will be patient. I have to wait for a feeler gauge to arrive from ebay before i can start my planned course of action anyway.
Thanks for the kind welcome ☺
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Post by grieve on Jun 29, 2015 20:37:21 GMT -5
Hi
I am after some advice with my 2008 50cc Xingue Chinese scooter.
I have owned it for 2 years and ridden it 5 days a week to and from work 5 days a week and home for lunch and back most days. The one way trip is 1.2km (3/4 mile) and mostly open road with 60km/hr (35mph) speed limits with 2 intersections at each end.
My scooters issue is towards the end of each leg of this journey. It starts first go, runs well, idles maybe a little high, runs fine when on the open road but at the last turn when I have to slow down and accelerate again, the engine bogs down really badly when I hit the throttle and won't pick up again. I have to give it maximum throttle to keep the engine going or it stalls. It will start again but has the same trouble. If I let it sit for about 20 minutes it will come good and be rideable again.
I find myself praying for there to be no traffic so I dont have to slow down as much to make the turns, or worse come to a stop because I know there is a good chance the engine won't pick up again. A few times I have coasted into the driveway with a stalled engine.
I have recently replaced the spark plug which was very black covered with powdery sooty black stuff. I also replaced the fuel filter at the same time with one of the generic types. While I was in there I noticed the vacuum hose looked loose on the petcock so I pushed it back on amd reclamped it.
Anyway I have decided to have a shot at fixing this myself due to a lack of available funds to get the job done by someone else.
What I was thinking was this:
1. Check and adjust the valves to 0.05mm
2. Follow the carb tuning instructions I found on this forum by user Alleyoop, cleaning the carb if necessary.
3. If that doesn't work maybe have a look at the enricher?
After that I'm out of ideas...
Am I on the right track??
Any advice greatfully received - thanks in advance.
Regards,
Cameron
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Greetings
by: grieve - Jun 29, 2015 14:40:33 GMT -5
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Post by grieve on Jun 29, 2015 14:40:33 GMT -5
Hi everyone,
My name is Cameron, I'm from Forster in Australia.
I ride a Xingue "Manhattan Gondola" 50cc scoot, has the same Chinese engine you see everywhere. I have owned it for 2 years and until now it has run perfectly So I am after some advice on working on it myself.
I don't have much experience with engines but I am technically minded and can follow instructions.
See you on the forums,
Regards
Cameron
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