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Moped Riders Association • View topic - 1993 Jawa 210 No power with rider?

1993 Jawa 210 No power with rider?

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1993 Jawa 210 No power with rider?

Postby rgp717 » Sat Sep 08, 2007 8:29 am

Hi, I'm glad I found you all. Just purchased a 1993 Jawa 210 for my 14 year old son to take to school. It starts up (though it takes effort to get it going), and it runs like crazy on its center-stand. But the minute my son tries to ride it, there is no power (we're talking 3 mph tops). The motor just won't get any rpms.

I checked gas, and gas lines, and I'm pretty sure it's ok. It's my strong belief that the carb is ok (could be better, but ok). I pulled off the exhaust pipe but that made no difference (though the noise was deafening). Compression is 110.

Some hints: The previous owner bragged about replacing the clutch plate (is there such a thing on a moped). Could he have screwed something up there? If it were a car, it feels like there is no spark advance to me? Finally, I noticed during while my son was cranking it over, that puffs of air/gas were coming out of the carb, and then once it started, no puffs coming out anymore. Any help would be very much appreciated. Thanks.
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re: 1993 Jawa 210 No power with rider?

Postby pehuskey » Sat Sep 08, 2007 10:07 am

How do you choke that model?
It sounds like the choke could still be engaged
Fight apathy...or don't, whatever.
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re: 1993 Jawa 210 No power with rider?

Postby steamboat » Sat Sep 08, 2007 10:35 am

Here is the link to a Jawa 210 workshop manual in our repair section. Hope this helps. Jim
http://www.mopedriders.org/article_view ... fldAuto=17
I would rather be tried by 12 than carried by 6
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re: 1993 Jawa 210 No power with rider?

Postby rgp717 » Sat Sep 08, 2007 12:34 pm

pehusky and steamboat -- thanks for the replies. I already found the links to the various manuals, and I'm a good wrench, but my diagnostic skills are not so strong. So, I'm hoping for some educated guesses from the members here.

Choke - there's a push button located on the carb; push it and the choke engages. Reving the throttle releases the choke. The choke is wide open (no choke), motor is warmed up, and we still have the problem.

New hint: My son and I cleaned the carb (again) and exhaust this morning. No improvement. However, I was checking to make sure the cylinder bolts were tightly secured to the cylinder, and I'm pretty sure one of them is stripped. Contrary to the picture in the manual (http://www.mopedriders.org/article_view ... fldAuto=17), my head only has 3 bolts? Two on the bottom corners and one in the middle (just below the sparkplug).
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re: 1993 Jawa 210 No power with rider?

Postby steamboat » Sat Sep 08, 2007 12:41 pm

Check your compression and let us know. Jim
I would rather be tried by 12 than carried by 6
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re: 1993 Jawa 210 No power with rider?

Postby rgp717 » Sat Sep 08, 2007 2:22 pm

Compression is 110, which doesn't sound too bad to me. Especially, since it's just me kicking the pedal (throttle wide open). Also, we started the motor (starts easier thanks to the carb cleanings), and while the motor was idling, I sprayed some starter-fluid around the seal of the cylinder. No change is speed or rpms, which I think seems to indicate the compression is OK and the seal is decent.

Still puzzled. Is there a spark advance system on a moped?
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re: 1993 Jawa 210 No power with rider?

Postby steamboat » Sat Sep 08, 2007 3:10 pm

2-stroke mopeds operate with fixed timing but it must be set correctly. Some if not all Jawas have an electronic ignition system which I know nothing about. Jim
I would rather be tried by 12 than carried by 6
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re: 1993 Jawa 210 No power with rider?

Postby Houdini » Sat Sep 08, 2007 4:11 pm

My ped had this same exact problem, because it was getting too much gas, and not enough air. Down jet, or clean/ replace your airfilter.
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re: 1993 Jawa 210 No power with rider?

Postby niss » Mon Sep 10, 2007 3:04 pm

Image
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re: 1993 Jawa 210 No power with rider?

Postby rgp717 » Wed Sep 12, 2007 7:45 am

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re: 1993 Jawa 210 No power with rider?

Postby TowerTower » Wed Sep 12, 2007 2:17 pm

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re: 1993 Jawa 210 No power with rider?

Postby bryanofmyrons » Wed Sep 12, 2007 11:56 pm

Bryan...a Myron's Maniac since Ride #3
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re: 1993 Jawa 210 No power with rider?

Postby TowerTower » Thu Sep 13, 2007 9:38 am

Almost forgot one more liklihood - the reed valve is also involved in "timing". If the reed material is cracked or not sealing properly, a key symptom will be lack of power under load.

Don't know if Jawa's have reeds, but if they do, unbolting the intake manifold would be the way to check the condition of the reed.
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re: 1993 Jawa 210 No power with rider?

Postby rgp717 » Thu Sep 13, 2007 4:47 pm

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re: 1993 Jawa 210 No power with rider?

Postby TowerTower » Thu Sep 13, 2007 7:55 pm

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