Compression after 9 Months

Wheel Rush · #1 03-31-2009, 03:39 PM

Howdy Mates, Its been awhile.

I have had this 80cc running now for about 9 Months, and put a few miles on it a week,

to give you an idea, I doubt that I have used more than 7 gallons of gas, but recently

noticed, it runs OK, but it seems a little harder to kick off, meaning, . . It used to pop off easily

and start right up, however now it doesn't fire on the the first try, after a hardy pedaling,

it fires and starts up. Has the compression changed that much or should I start checking

further?

azbill · #2 03-31-2009, 03:54 PM

is the gas mix old ?
2stroke mix gets stale pretty quickly (within 2 weeks, I think)
check you plug as well ...might be fouled
mine has a little under 4k on it and takes forever to start now
(I should shoot it and put it out of it's misery, but I need it till my new drivetrain comes in)

Wheel Rush · #3 03-31-2009, 03:58 PM

I guess it could be as much as two weeks, but that would be about it.

I'll try to spray some start up fluid into it next time to see if it will kick

faster and easier.

Pablo · #4 03-31-2009, 05:35 PM

Sounds like a tired plug? What plug? How old?

Wheel Rush · #5 03-31-2009, 06:42 PM

Hi Pablo,
It's an AGK B6HS, its been in for 7 Months, and is pretty well carbon coated, but not really caked. Whatya think ?

Pablo · #6 03-31-2009, 07:09 PM

NGK right? I would change plugs. Low cost, simple things first.

Sydneysider · #7 04-01-2009, 10:59 AM

I had some similar probs, and found the muffler was chocker blocked with carbon.. cleaned it right up and it fired up right away and the power was back up again. Hope this helps.

Wheel Rush · #8 04-01-2009, 11:15 PM

OK, Thanks I'll get on it, . .

It more than likely is one of the two of those, The things is with most start up even if it needs another try, you can here the compression stroke exhausting, But on the occasion I am getting nothing but a slow gruel to a hard pedal stop, I do not hear the compression escaping.

I'm not sure exactly what to think about that, . .?

Is that do to the fact that a burn combustion is pushing out the exhaust valve with enough pressure that it is causing the sound of exhaust escape?

If so, I guess then a clogged muffler would have similar results,

I think you guys know your 2 strokes.

I'll let you know.

Goat Herder · #9 04-01-2009, 11:49 PM

Does it have power after warming it up? Mine was pretty wore out for compression at 5000 miles when It finally just didn't have power but it would start right up! Maybe spark dunno. I saw old gas give these CH a bad attitude.

Sydneysider · #10 04-02-2009, 12:23 AM

Quote:

Originally Posted by Wheel Rush

OK, Thanks I'll get on it, . .

It more than likely is one of the two of those, The things is with most start up even if it needs another try, you can here the compression stroke exhausting, But on the occasion I am getting nothing but a slow gruel to a hard pedal stop, I do not hear the compression escaping.

I'm not sure exactly what to think about that, . .?

Is that do to the fact that a burn combustion is pushing out the exhaust valve with enough pressure that it is causing the sound of exhaust escape?

If so, I guess then a clogged muffler would have similar results,

I think you guys know your 2 strokes.

I'll let you know.

Most likely. I found with mine when I opened full throttle at idle, it would rev extremely slowly at first but once it hit that higher rev, it would shoot right up meaning that there was enough pressure to escape out of the engine.