From:Dave Harris
Subject:RE: RE: RE: RE: RE: out of ideas Date:Sat Aug 19 10:24:42 2017
Response to:22242
Thanks! I needed that.
Talked at length to Mutt and he is pretty sure it is an air leak probably at the carb flange as they often are bent out of shape from over tightening. Another contributor suggested that as well. I will try that 1st and then may need to change the oil seal on the clutch side. He said the best test is to spray wd40 on the area while running and see if there is a positive change. I will report the outcome.
Really appreciate the web site and all the advise I have gotten from it. I don't think I could have done this project without the help. I watch the exchange every couple days and like to contribute when I can.

Thanks again.

I make my living as an Industrial Engineer/hands on
mechanic/machinist and have been fixing my own stuff
since I was 6 years old. NOT giving up and finding the
solution has always been my specialty and put food on the
table. What this has taught me though is that sometimes
it's more cost effective to sub projects out to those who
specialize in certain areas. Mutt is one of those and
that's why I contacted him. As the webmaster I chose to
remain neutral in endorsing any particular vendor or
member. I chose Mutt to address my problem and he did. I
would suggest a telephone call to him. The object is to
get the job done. Best of Luck. Resurrecting historical
antiques is not always as easy at it might appear.

O.K. I give. Can I send Mutt the carb to be fixed? I
don't think I need a complete engine overhaul but am
willing to ship the whole thing to someone who can make
it right. Maybe cost prohibitive but I would like to get
it done. This project has a lot of history for me. The
start of a great 50 + years of biking and a lot of
great memories.
Thanks so much for the help.

Yep, very similar

Hey Mutt, doesn't this sound like the carb problem you
fixed on my Scat motor?

62 Scatt resurrected from 30 + years rusting outside
somewhere. I went to school for aircraft mechanics and am
handy with engines. Actually have some experience with
this model which I owned when I was 14. It was new then.
Do the math.
I am about 75% done and working on getting the engine to
run consistently. Looking thru the exhaust port the
cylinder walls and piston head looked very clean and I
get good compression. I have replaced all the mag and
spark components and had the mag rotor re-magnetized by
Stan Waite. It came back from Stan super strong so I know
that is not the issue. I did not replace the ignition
coil as the spark is now good. Carefully cleaned and
rebuilt the carb and triple checked adjustment
recommendations. Just took it apart again and all looks
good. Replaced the oil seal behind the mag.
The problem:
The bike will bump start with effort. Will run at high
speed with the choke off and 1/2 choke to run at just
above a proper idle. No amount of carb adjustment will
improve this condition. All the gears run out and
everything else is good but the erratic engine speed. Not
road worthy.
I really don't know where to go from here.


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