In the last week my newfound speed seemed to dwindle mysteriously away. (Honda PA50I)
The symptoms ?
Just gets to 25mph.. and kinda bogs there and 'crackles'... it won't rev out... (the same way it acts till it warms up)
Following all the typical advice I give people... I did a fairly quick carb clean... found no dirt or blockages... hmmmm why is it slow then ?
Cleaned the points.
Checked ignition timing... it has moved since I last set it... so I re-set it about 5 times.. till it ended up where it should (a little advanced).... hmmmm .. no help ... why is it slow then?
Checked the air filter... not bad... it still acts lean anyway... dirt would richen it up.. experimented with removing the air filter.. no help... taped the filter up (to reduce air flow)... no help... dang !
This time I cleaned the carb very carefully.... NO HELP !
Awright... slept on it... and I just had the feeling that something ws just stopping the airflow.
The exhaust pipe is a handmade one... several years old... nearly straight thru (except for the easily removed baffle I made for it).
I have never cleaned it because it is so simple.... I suspected maybe the only 'tight spot' in it might be carboned up.
I jammed a bent rod up there and wiggle-waggled it around... while I was at it I cleaned the exhaust port a little... (not bad).
It flies now... that exhaust pipe must have slowly built a carbon brigde over that 'tight spot'.
It goes an easy 35mph on flat ground.
My 0-25 has dropped to 15.5 seconds... (was at 26... then 22... then 19... now 15.5)
If I had reached this point a week ago... I would have ridden to the BBQ (150 miles).
By the way... Chris R. - this is without the PA50II reed valve... when I get that and gear it up (IF I can)... this thing could do 50 maybe.