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Hi guys,
I am trying to figure out the scooterhelp page's directions on the timing marks. Can some one help me with the marks that I am supposed to line up?

Here's the page, I am following the instructions for the image on the left side...the PX flywheel:
http://www.scooterhelp.com/tips/timing/electric.timing.html

And here's the text that has me confused:

"PX200, PX150 & PX125: The image on the left is a flywheel shared by the all these models. It has a mark on the flywheel casing labelled 'A' (23 BTDC for the 200cc model) and 'IT' (18 BTDC for the 125 and 150cc models) which should align with a casting on the flywheel (blue arrow) at the correct degrees BTDC. These flywheels are easily identifiable as they do not have an inspection hole with a rubber grommet"

...So am I correct in assuming that if I line up the timing casting mark on the flywheel to the mark 'A' on the flywheel cover I am good to go?

Or is it 23degrees beyond the 'A' mark that the flywheel casting mark should be located?



I shot the timing light on it the other day to see how it worked, and this is what i saw:
External inline image provided by member with no explanatory text

If you can tell on the image, the casting mark on the flywheel is between 'A' and 'IT'...it seems like to should be lined up with 'A'.


man...i hope this will resolve the way my bike it running..... Crying or Very sad emoticon
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Re: question on flywheel timing marks
rodri9o wrote:
...So am I correct in assuming that if I line up the timing casting mark on the flywheel to the mark 'A' on the flywheel cover I am good to go?

Or is it 23degrees beyond the 'A' mark that the flywheel casting mark should be located?
Indeed, you are correct. It should line up with the A, not be advanced or retarded from that. That said, sometime the marks are unreliable.

To ensure that you do, in fact, fire at the right time you can look up how to determine Top Dead Center (TDC), use a degree disk and verify the marks on the flywheel and cover. If they're off you can make your own.

There are specific instructions at scooterhelp as to how to go about this.
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Thanks Phaetn. I did see the TDC tool and how to make one from a spark plug.

Hopefully this will get the bike going past 80kph...it looks to be advanced from the timing mark and at 80 it feels like it cannot accelerate any more or does so very very slowly
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Molto Verboso
1974 Rally 200, 1977 Rally 200, 1958 LD125 Mk III, 1965 S.S. 180 and on and on
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@bar_italia_classics avatar
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You should fix the timing but, sadly, there must be other problems. A two degree offset will not drop your top speed by 40kph. A stock PX200 should do a 110 to 120kph (indicated) easily.
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Bar Italia Classics wrote:
You should fix the timing but, sadly, there must be other problems. A two degree offset will not drop your top speed by 40kph. A stock PX200 should do a 110 to 120kph (indicated) easily.
Oh...that sucks...

I have checked the torque on the carb, the head, recently new ignition coil, plug, wire, cleaned out the fuel tap, cleaned filter in carb, fuel hose unobstructed, has a new top end with new gaskets, carb gasket is new, and stator coils look like bright copper.....what the heck else can it be??

Crying or Very sad emoticon Crying or Very sad emoticonI feel like I'm grabbing at straws

We'll see how it goes tonight when i adjust the timing.
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Primasarah
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You just installed a brand new cylinder kit, right? Did you install the piston upside down?
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TravisNJ wrote:
You just installed a brand new cylinder kit, right? Did you install the piston upside down?
I dont think so...arrow was toward the exhaust outlet, right?
@travisnj avatar
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Primasarah
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I'd check it. It'd be a reason at least.
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TravisNJ wrote:
I'd check it. It'd be a reason at least.
I guess you're right. It'll only take about 1 hour or so, so it is no biggie.

Would it run well if it had the piston on backwards, though? Because up until it hits 80, it kicks ass, but then its like night and day...
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Primasarah
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Yes it will. My piston was installed backwards and it had the same issue.
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TravisNJ wrote:
Yes it will. My piston was installed backwards and it had the same issue.
oh, shite.
this is driving me so nuts i guess i have to question everything I did...
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measure twice, cut once
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jamesjohn wrote:
measure twice, cut once
Yeah...I try to do that as much as possible, but I make mistakes
Hopefully it will be that and that will put my mind at ease.

I hate when things don't work as they should.
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