New Rider
Currently Offline
Posts: 30 
Likes: 0
Joined: Jul 26, 2015 1:09:46 GMT -5
|
Post by arron on Aug 9, 2015 12:30:14 GMT -5
Will one of you gurus help me to diagnose my spark plug, looks like it might be lean but I would like the experience of a seasoned rider/wrencher. Thank you in advance for all who reply. Arron   |
|
|
|
Post by tvnacman on Aug 9, 2015 14:49:08 GMT -5
|
|
|
|
Post by horace on Aug 9, 2015 15:55:38 GMT -5
IMHO, it looks Good to Ok.... No excessive build up or dry detonation noted. Possibly a bit lean......... Not too bad though.
A brand new plug (or a few) would be a better way to really get it dialed in.
If you can, Run a few different plugs with the same start/stop distance..... (don't throw out decent plugs)
With the pictures provided, it seems you are have a decent, road worthy scoot.
Are you having any type of bogging or lack of power at different throttle positions?
|
|
New Rider
Currently Offline
Posts: 30
Likes: 0
Joined: Jul 26, 2015 1:09:46 GMT -5
|
Post by arron on Aug 9, 2015 19:14:13 GMT -5
The scoot wont stay running once it warms up, from a cold start I can ride wot for 10-15 miles with no issue, but if I turn the engine off and don't let it rest for at least a couple hours, it will stall like its getting no fuel. once it dies, it starts right back up, but it will die again, sometimes in a few feet or sometimes a couple hundred feet.
This was an intermittent issue, but now it is constant and left me stranded last night. When I went to pick it up this morning, it started right up and got me the 2 miles to my house with no problems.
I replaced all the fuel and vacuum lines, petcock valve and checked and cleaned out the gas cap vent hole. I just bought the scooter used about 3 weeks ago. Its a 2008 lance Phoenix with 8000 miles on it. I am about to tear my hair out. Tomorrow I will be adjusting the valves in the hopes that they have tightened up and are causing the bike to overheat. My air filter is good and I just changed the oil, engine and gearbox.
When the engine sits overnight, it will run fast and smooth, I see 60+ wot even on a slight incline, but once I have been riding for about 40 minutes or so, I cannot get over 50(unless I am going down hill) and rpm wont exceed 5500(6500 when cold).
I also replaced the CVT belt as the old one exploded, pulled the variator and clutch and cleaned out everything.
This was intended to be my primary mode of transportation as I am poor and needed transportation to be able to get back and forth to work at non bus hours.
I love this Scoot, even though she is giving me so many problems, I just want to be able to ride her without wondering if I am going to get stuck somewhere.
Thank you for any direction you can give me.
|
|
|
|
Post by pistonguy on Aug 9, 2015 19:54:37 GMT -5
Go thru that Valve Adjustment.
take your time
Dbbl. Check your work by rotating the engine a couple times by hand and re-check.
Report back
|
|
|
|
Post by lain on Aug 9, 2015 20:00:21 GMT -5
If adjusting valves doesn't work then try another CDI or ignition coil. Also is the spark plug boot tight on the spark plug or does it jiggle a lot?
|
|
New Rider
Currently Offline
Posts: 30
Likes: 0
Joined: Jul 26, 2015 1:09:46 GMT -5
|
Post by arron on Aug 9, 2015 22:43:38 GMT -5
Spark plug is tight, Put a new iridium plug on it, the one pictured is the old one with about 500 miles on it.
Someone else told me if it was the CDI that it would just be dead, either they work or they don't.
I went through the entire wiring harness and there are no loose connections or frayed wires.
Remember, it only happens when the scoot warms up and I shut her down. After I restart and try to ride that's when the stalling happens, if let her sit overnight or for a few hours, I have been able to run with no problem which makes me believe that it's overheating. Especially when I'am getting more power when its cold outside, like early in the morning.
Will tight valves cause overheating? I live in a hot area in Southern California and ride wot for long stretches, 10-15 miles sometimes.
I will update when I get the valves done, have to borrow the gapper tool and cant get it til tomorrow so I should be able to do it by Tuesday, until then I will be busing it.
|
|
|
|
Post by lain on Aug 10, 2015 0:56:41 GMT -5
Whoever told you about CDI's is very wrong. I've NEVER had a CDI just simply stop working, it is quite the opposite. Every time I've had a CDI die or fry it would slowly pickup symptoms until one day it would either stall out mid travel and leave me pushing it home or it would die after starting, or it would stall out and would not start until it cooled down to a "cold" engine temp again.. CDI's are just tiny boxes of capacitors.
|
|
|
|
Post by tvnacman on Aug 10, 2015 4:50:54 GMT -5
Whoever told you about CDI's is very wrong. I've NEVER had a CDI just simply stop working, it is quite the opposite. Every time I've had a CDI die or fry it would slowly pickup symptoms until one day it would either stall out mid travel and leave me pushing it home or it would die after starting, or it would stall out and would not start until it cooled down to a "cold" engine temp again.. CDI's are just tiny boxes of capacitors. I have seen many different symptoms with cdi's, if you have any doubt try another one. One second good next bad, no start plug shows spark (at the wrong time) backfiring. The spark plug chart came from another poster I liked it and saved it. John |
|
New Rider
Currently Offline
Posts: 30
Likes: 0
Joined: Jul 26, 2015 1:09:46 GMT -5
|
Post by arron on Aug 10, 2015 16:09:57 GMT -5
So John, I know you are one of the trusted parts suppliers in this forum, as I have been referred to you by another member of this forum, and when I am up and on my feet financially , I will want to rebuild the Phoenix for performance and will be ordering from you because of your knowledge of the 157qmj-3 engine and its unique parts. For now, I just need to make it run. What are the pitfalls of buying a cheap DC CDI from China for 7 bucks besides the wait for shipping.
|
|
|
|
Post by tvnacman on Aug 11, 2015 6:03:38 GMT -5
its a long wait on a gamble, my cdi's I test before they go into stock. Post a picture of your stock cdi. I have stock dc and ac cdi's.
John
|
|
|
|
Post by pistonguy on Aug 11, 2015 9:23:06 GMT -5
Whoever told you about CDI's is very wrong. I've NEVER had a CDI just simply stop working, it is quite the opposite. Every time I've had a CDI die or fry it would slowly pickup symptoms until one day it would either stall out mid travel and leave me pushing it home or it would die after starting, or it would stall out and would not start until it cooled down to a "cold" engine temp again.. CDI's are just tiny boxes of capacitors. Bruh, I Ghosted One. One minute she fire next she don't. The The The thats all folks. I think I still got it round somewhere. |
|
New Rider
Currently Offline
Posts: 30
Likes: 0
Joined: Jul 26, 2015 1:09:46 GMT -5
|
Post by arron on Aug 11, 2015 9:47:59 GMT -5
|
|
New Rider
Currently Offline
Posts: 30
Likes: 0
Joined: Jul 26, 2015 1:09:46 GMT -5
|
Post by arron on Aug 11, 2015 10:05:04 GMT -5
Performed an experiment yesterday. Rode her for 20 min WOT but didn't shut her off, just slow putted around the parking lot, then turned around and rode home with no problem. As long as I don't shut her off, there is no stalling. Once I kill the ignition and try to start back up and ride hot, Stall stall stall. Let her sit overnight, and I am good again.
|
|
|
|
Post by tvnacman on Aug 11, 2015 10:38:43 GMT -5
check your valves
|
|
