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Post by dmartin95 on Apr 21, 2015 23:38:33 GMT -5
I got a scooter on the lift right now that has an issue with cold starting.....
I have to crank it for about 60~120 seconds (in 5 second burst) to get it started when it's cold or been sitting for over a day or so....
Once the engine is started, it runs like a champ through the entire power band and re-starts without issue. Once warm, it runs as if it's new. The scooter only has 444 miles on it but it is a 2012, assembled in spring 2013.
I've removed all emission stuff, installed NGK plug with proper gap, manual petcock and all air and fuel lines replaced with quality Tygon.
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Post by onewheeldrive on Apr 21, 2015 23:48:28 GMT -5
Sounds like the valves may need adjusted? It's usually the culprit when I have starting problems like that.
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Post by dmartin95 on Apr 22, 2015 0:05:38 GMT -5
I was kind of thinking the valves too, however, I've never owned a machine that needed the valves adjusted that quickly... But, It's always had this issue and I traded for it used at around 200 miles. I suppose it's possible the valves were incorrectly set from the factory or never set during initial PDI. I will check the valves on Friday when I get out there.
In the meanwhile, I'm curious as to if others think it's valves.....
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Post by geh3333 on Apr 22, 2015 5:30:11 GMT -5
I got a scooter on the lift right now that has an issue with cold starting..... I have to crank it for about 60~120 seconds (in 5 second burst) to get it started when it's cold or been sitting for over a day or so.... Once the engine is started, it runs like a champ through the entire power band and re-starts without issue. Once warm, it runs as if it's new. The scooter only has 444 miles on it but it is a 2012, assembled in spring 2013. I've removed all emission stuff, installed NGK plug with proper gap, manual petcock and all air and fuel lines replaced with quality Tygon. If my scoot isn't tuned in just right , I'll sometimes have that issue. It usually only happens if its cold and sits awhile. If its warm out it usually strata right up , even if it sits awhile. But for the colder weather I have to have it tuned just right . |
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Post by urbanmadness on Apr 22, 2015 9:53:12 GMT -5
I second (or was it third) valve adjustment.
You usually have to adjust them pretty early the first time. (break in)
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Post by tvnacman on Apr 22, 2015 15:16:53 GMT -5
I check them even if I think I have a problem. Its not a big deal and its quick.
John
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Post by dmartin95 on Apr 22, 2015 18:20:09 GMT -5
Well, I finsihed my Job ahead of schedule, so hopefully I'll be able to get out in the shop tonight and get the feeler gauge on valves and see where they're at... I'm not sure... I'm pretty tired... Just worked for 16hrs straight...... But I'm really anxious to get out in the shop and see if the valves are in fact the problem... IF not tonight, tomorrow for sure.... I have all day free to play tomorrow... Actually, I'm free till next Monday unless someone calls with an emergency (which always seems to happen when I get free time).... ----------------------------------- Here's another question for all of you..... I'm getting ready to pull this motor and put a scrappy 161QMK on this scoot.... Would you even bother? I only want to in case I sell it someone... Want to make sure they get a good running motor. Or in case I use it..... Actually.... I'm rambling... LOL....  I'm soo tired, I'm getting slap happy... Perhaps going anywhere near tools right is a bad idea. |
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Post by JerryScript on Apr 23, 2015 10:41:16 GMT -5
Very few do a valve adjustment during PDI, assuming the factory set then right. I do set my valves during PDI, example, my 150, ccame with exhaust set at zero tight.
Is the enricher working?
Do you have to turn the throttle at all when starting it cold?
Is the plug boot new?
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Post by dmartin95 on Apr 24, 2015 2:11:31 GMT -5
Very few do a valve adjustment during PDI, assuming the factory set then right. I do set my valves during PDI, example, my 150, ccame with exhaust set at zero tight. Is the enricher working? Do you have to turn the throttle at all when starting it cold? Is the plug boot new? I pulled the valve cover and as everyone guessed, the valves needed adjusting... They were closed so tight I couldn't get any of my feelers into the gap... "zero tight" as you put it... I wound up adjusting the intake to .003 and .005 on the exhaust. She starts right up now. it was 39° and she fired as if I had just been riding.. I made a video of the process. |
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Post by JerryScript on Apr 24, 2015 13:46:40 GMT -5
I imagine they test these engines with a very strong power supply, probably not the weak battery they ship with. Together with the valves fully seating and naturally tightening up during first run, this could lead to over tightened valves still starting and passing QC.
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Post by lain on Apr 24, 2015 13:59:12 GMT -5
I know a couple scooter shop owners, they swear they do the adjustments, oil changes, carb tune-ups, and everything before letting the customer take off, but I constantly see it to be true to be the opposite. Shops can say any words they want, but you gotta check it before signing anything, or else they just say oh well you bought it already. A lot of shop owners don't even know how to do the maintenance, they have other people do it for them, who may or may not be trustworthy but the shop owners don't know the difference.
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