From:Dave Harris
Subject:RE: RE: RE: RE: RE: RE: out of ideas Date:Mon Aug 21 17:39:13 2017
Response to:22243
Still a good high end but won't kick start or idle. Been thru the carb several times and tried all kinds of adjustments. I think it is confirmed that I have an air leak messing with my fuel air mix. I have tried a new mag side crank seal and have eliminated the issue at the warped carb flange by sanding it flat. Next is a new seal on the clutch side crank. Looking for other areas that air could enter the cylinder I see a cylinder base gasket and possibly the seal at the crankcase split. There are some oil leaks under the engine I have not figured out yet. Possibly at the case split.
Was hoping to resurrect this weathered old girl with out a complete engine tear down. Especially when the trans is O.K. But I am not in a hurry. Enjoying the project.
Currently thinking of pulling the head, splitting the case and doing a top end plus the new cylinder base gasket, case seal and left hand crank seal. I don't think there is anything left. Its got to work. Right?
Thanks for all the advise from this web site. A huge help!

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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