new problem spuders and won't stay running By seanstr (Read 6,451 times)

[seanstr]

new problem spuders and won't stay running, feels like it's loosing spark half the time also bogs down. The exhaust was completely off for 300 miles. I am at a loss. Please help! Iwas getting 67mpg same day this started.

[sprocket]

No exhaust for 300 miles....you have probably burned a valve...or overheated the head...

You need to run a hot and wet compression check...

[Bashan]

Aug 27, 2011 13:51:19 GMT -6 sprocket said:

You need to run a hot and wet compression check...

[/b][/quote]
Why, Mistuh SPROCKET!!

So Seanstr, no header pipe at all for 300 miles? Rich

[ce]

Well, he didn't notice it was gone for 150 miles, then he had to go back and get it.

[sprocket]

These engines don't like 300 miles with no header/exhaust.. they don't like 10 miles with no header/exhaust...

All kind of weird things can happen... valve guides give out, exhaust valve burn, valve seats over heat, the heads deform...

Great way to ruin an engine IMHO...

Pull the valve cover and set the valve gaps first...you may be lucky, but I suspect you will need to replace the head...

Rich you are just BBBBBBBBBBBBAAAAAAAAAAAADDDDDDDD

[Alleyoop]

Well if he did NOT notice it for 150 miles he has to be DEAF. crap are you kidding me that would be loud as crap.
But live and Learn as they say, some people think they can just ride them no matter what the problem is, Backfireing, Bogging, shooting out flames out of the muffler, that they think is cool. But once they have to start dishing out for another motor or major parts they may leave the scoot parked until the parts come in.
Alleyoop

[seanstr]

Ok, the valve adjustment is done

[seanstr]

I didn't notice it was wrong. Should have asked here. So, it acts like the electrical isn't working half the time. Doesn't do it all the time. Just sometimes

[Alleyoop]

Seanstr,
So does it start up and run? Please explain how is it acting? Starting off does it BOG go WAAAAAAAA or backfires or what is it doing.
Alleyoop

[seanstr]

Ok, it still starts,& when I just start it, runs normal, then ay some point the engine starts to bog down, sputter, & feels like it's missing. It then dies. I pull over, it fires right back up. There is no power. It then dies if I give it throttle. I somehow finesse it, after several re-starts, goes, sometimes normal, other times the sputtering & dieing. Yes, the weird back pressure popping is still there, but very muffled as muffler is back on. Like I said I adjusted valves, but it didn't help. Something else is wrong.

[seanstr]

Aug 27, 2011 14:11:32 GMT -6 Bashan said:

Aug 27, 2011 13:51:19 GMT -6 sprocket said:

You need to run a hot and wet compression check...

[/b][/quote]
Why, Mistuh SPROCKET!!

So Seanstr, no header pipe at all for 300 miles? Rich[/quote]
What does hot and wet compression check mean? I don't have a compression checking tool.

[sprocket]

HOT and WET... compression check.. you run the engine for 10 minutes (hot)... pull the plug and add a few shots of oil (wet) into the spark plug hole and then hook up a compression gauge and check the reading it should be above 130 psi for a GY6 engine.. 150++psi is a good engine

120psi is marginal and below that the rings or valves need to be redone...under 100 psi they usually won't run...

There are other ways of checking compression but this is the one I was taught 50 years ago so I prefer it...the automotive shop teacher used to say "Hot and Wet" and all the shop class would titter...makes it easy to remember too...

www.dansmc.com/compression_test.htm

[seanstr]

Ok, the problem became obvious once I tried to do compression test. Got the thing nice & hot, had oil, got to taking spark plug out, & the plastic cover that goes between plug & rubber protector. Also the compression tools at auto parts stores don't fit scooter's spark plug whole.

[sprocket]

You need a 10mm adapter.. most compression testing kits come with one...

[seanstr]

This one didn't have that adapter. Had one for a deeper well.