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Post by mftic on Jul 27, 2016 9:14:43 GMT -5
Well she died on me again and i have no idea why.
Cruising along and died on me right before a red light. Kept hitting the starter and it would start for half a second then die. Started it and gave a little gas and kept running with the little gas. Made it through the light and another 100 yards when died again. This time I couldn't get it to start back up. A couple times it would start up for less than a second then die again.
Took off the gas cap and shook the bike. Low on gas but it had enough to slosh around. Still wouldn't start. About 5 minutes later after calling for help it started and kept running. Made it the mile home as it ran like usual.
Went out last night later and it started up and kept running as I jiggled some wires.
So how am I supposed to diagnose the thing when it is running fine, LOL.
Sad thing is I can't rule anything out as I can think of scenarios where what I would normally rule out could be the problem.
I'll tear into it this weekend and check for broken/corroded wires.
Spark plug and boot seemed fine
Gas? I'll fill it up and keep it full as a last resort. I doubt it but maybe the pickup tube is raised and needs more gas in the tank?
Any thoughts from you guys?
Just remember. This is an old scoot and it's not worth it to just start replacing parts to me. Also have this rule where 3 strikes and you're out. This is number 2.
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Post by lain on Jul 27, 2016 9:46:55 GMT -5
Sounds like the valves need tuning, or possibly loose wire if "jiggling wires" is what got you started and kept running.
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Post by mftic on Jul 27, 2016 13:15:04 GMT -5
I won't count anything out cause i have no idea.
Didn't "think" it was valves only because otherwise it runs good, starts good, and problem is intermittent. Not constantly happening at a certain point like i would assume valves do.
Jiggling wires was me trying to get it to duplicate the problem when i got home and it was running fine.
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Post by cyborg on Jul 27, 2016 14:20:38 GMT -5
Fuel tank venting issue
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Post by mftic on Jul 27, 2016 16:31:54 GMT -5
I thought that too so took cap off and it still didn't start. Isn't taking off the cap an instant fix? Question...which would exasperate this if it was a problem, empty or full tank of gas? Just curious because I think both times she died on me the tank was near empty. Can't remember the first time. |
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Post by lain on Jul 28, 2016 5:23:15 GMT -5
I won't count anything out cause i have no idea. Didn't "think" it was valves only because otherwise it runs good, starts good, and problem is intermittent. Not constantly happening at a certain point like i would assume valves do. Jiggling wires was me trying to get it to duplicate the problem when i got home and it was running fine. Stalling and not starting anymore due to valve clearances being off is not a constant issue until you keep pushing it in that condition. Eventually it would become impossible to start or run without fixing them. The way you describe the problem it could either be valve gap clearances (one of the valves are tight and when the engine heats up the heat expansion causes the valve clearance to become larger and offset timing) or ignition (electrical) problem most likely CDI or coil. It's actually very simple and easy to adjust the valves so don't let the idea of working inside the engine deter you... Another experience I've had that produced the same symptoms you are having was a faulty CDI, that's super easy to check if you have a spare just pop it on and see if it changes... Could also be missing or loose ground wire on the coil (the green wire on it). Often I find terminals LOOK good condition, then you go to move them and you find they are actually not making full connections so good idea to check them out at least. |
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Post by cyborg55 on Jul 28, 2016 8:08:04 GMT -5
I think Lain is on it,,,loose connector(s) cdi is going away or it could be the coil too,,,I've had a few of those go bad on me,,,run great till it warms up,,,shuts off and is no start till the coil cools,,,,then the maddening cycle starts all over again
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Post by rockynv on Jul 28, 2016 8:09:24 GMT -5
The ignition pickup is a $9 item that is notorious for this type of behavior too. Usually by the time you remove the seat bucket to check things out they have cooled enough to start working. Sometimes after giving you fits in the summer they will be fine in the cooler weather making you thing so other repair solved the issue. They many times slowly peter out like a fuel issue and then after a while cool down and the bike will then run for a while like nothing happened until it gets just hot enough to fail again.
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Post by mftic on Jul 28, 2016 9:02:48 GMT -5
Thanks guys. That's what I wanted to here otherwise I probably wouldn't have checked any of those things.
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Post by lain on Jul 28, 2016 9:26:34 GMT -5
Well I would check the valves first, if you have the tool for it it costs nothing to check them, don't have to adjust them to check them. 4 bolts and you're in. After that I would move on to spending money to swap parts, or find a friend with a working scoot and use his temporarily. Make sure to check grounding wires and whatnot before using your friends parts or you could fry his too. You will want to check with a multimeter, visual check is not reliable.
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Post by lhumpolick on Jul 28, 2016 13:55:39 GMT -5
My 150 vento Scooter is doing the same thing lights are dim until I get over 20 mph. I replace the voatage regular no help. the pick up was replace last year along with the stator . until today it would act up line not getting enough gas I let it sit a half hour later it would start right up again and run a hour before it would act up until today in had to push the little basterd 2.5 miles to get it home I will check for loose wires I have a spare coil and cdi unit. I was thing carb I replace it 4000 miles ago . this scooter has over 14000 miles on it may be time to replace it I plan on waiting till next year so I can buy a 3 wheeler .
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Post by lain on Jul 28, 2016 23:07:06 GMT -5
My 150 vento Scooter is doing the same thing lights are dim until I get over 20 mph. I replace the voatage regular no help. the pick up was replace last year along with the stator . until today it would act up line not getting enough gas I let it sit a half hour later it would start right up again and run a hour before it would act up until today in had to push the little basterd 2.5 miles to get it home I will check for loose wires I have a spare coil and cdi unit. I was thing carb I replace it 4000 miles ago . this scooter has over 14000 miles on it may be time to replace it I plan on waiting till next year so I can buy a 3 wheeler . Only 14k? You can get another 14k+ if you play your cards right. My current 150cc ride has over 32k on it and still running like new. I don't think anyone will follow my routines, but this is how I do my checks and whatnot; valves every 3 months, oil changes every 1 to 2 months (royal purple and marvel mystery oil 6:1, gotta love how it purrs with this mix all the way down to only ~1000rpm idle!), tire pressure checks every week, shot of seafoam or marvel mystery oil in the gas every 2-3 gas-ups, air filter cleaning at the change of each season (I ride year round), carb check and possible cleaning when doing air filter cleanings but  % of the time don't need to clean the carb, spark plug changes twice a year (usually right before and right after winter riding season), never had to change a cdi since I got casoli cdi's, change coils in the beginning of the winter usually. Most of my problems I come into when I stick to this routine are loose wires or physical damage like a recent mega failure I experienced with a foreign object destroying the engine, or letting someone borrow it and they bring it back after obviously crashing it which was another problem I had in the past. |
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Post by lhumpolick on Jul 29, 2016 21:41:42 GMT -5
Update on Vento 150
I replace the coil it started up then i ran the scooter around my apartments then it died again this time I checked for gas in the fule filter it was bone dry.
Check and found out the vacuum hose was disconnected from the carburetor i replace the hose now it seems to run good.
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Post by mftic on Jul 30, 2016 13:18:52 GMT -5
It's about 15 degrees colder today but tried to duplicate the problem anyway. Ran the scoot hard for almost 20 miles after filling it up. No problems.
Tank hold just about 1.6 gallons and I put in 1.28 gallons of gas. Was lower than i thought.
Have some feeler gauges coming in tomorrow. Will check the valves and wiring as soon as I can. Otherwise I think i'll try riding to work next week as it's supposed to be hotter and we shall see.
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Post by 4950cycle on Aug 1, 2016 1:13:01 GMT -5
My first thoughts were "fuel" , Then valve adjustment as said. And they (the valves) can drive you nuts on this 260 Linhia I have. Depending on how hot or cold the weather or engine is as stated. I know yours is a 150 . But much of this scooter HooRah is universal. Vac line to fuel pump I presume ?
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% of the time don't need to clean the carb, spark plug changes twice a year (usually right before and right after winter riding season), never had to change a cdi since I got casoli cdi's, change coils in the beginning of the winter usually.