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Ok, so now I have a question for the POG collective:
I put the Bing back on the 73 250 HS and it seems to run great.  

But while gathering parts, I ended up with a few Bing 84's (and a 74/75 MX1 250 Can-AM).

Anyway, a couple of the Bing 84's have some sort of choke or other mechanism screwed on to the carb body.  Can someone explain to me, or tell me where to find, what it is and how it works?



Andy
#14u
MOVMX, AMA, AHRMA

Larry,
This is what I found.  They sure dont make it easy to see what is scheduled!

https://www.amavintagemotorcycledays.com/page/vintage-hare-scrambles-2019/


Andy
#14u
MOVMX, AMA, AHRMA

OK, thanks Mike.  I will take a closer look at the silencer this weekend.

William: I got the fork boots from Al Buehner.  http://www.pentonpartsusa.com

Al also has a ton of parts that don't show up on his web page, so call and ask.

Andy
#14u
MOVMX, AMA, AHRMA

Thanks for all the questions/comments, I do appreciate it.
I have made a bit of progress this last week, here are a few more pics and some of my own comments and a question.

I went with a 520 chain. The chain guide/slider will need some adjustment as it isnt centered.

I did the Mikuni conversion. I know, Bing is the Thing on Penton, but I have 4 other vintage MX/HS bikes and they all have Mikuni carbs. Given my history/knowledge base/spares, I went with the conversion.

I had to do some fiberglass repair on the side panel and tank, but I drain the fiberglass tank on the other bike after each ride, so I think it will be OK with this tank.

I am guessing that the 250 exhaust spring length is around 95mm. All of my spare exhaust springs are for Hodaka's and an American Eagle Geronimo, and are shorter.
The Curnutt shocks are getting a rebuild.
First start up was pretty easy, 4 or 5 kicks, so far it has started after that with one kick (4 short heat cycles, low rpm in first across flat ground). The motor rebuild seems excellent.

I am not sure I like the extra flywheel weight on the HPI ignition.  I will pull it off and do a few more heat cycles to the motor, just to see the difference.
I have added a separate ground wire (ignition case, head, coil mount, all verified with a Fluke).
I need to work on the cable routing a bit to free things up and secure them from tree snagging.

Last one is a question:
How does the end cap come off the pipe on this bike?  I dont see a fastener anyplace; is it crimped on?




Andy
#14u
MOVMX, AMA, AHRMA

Thanks Jerry, and I am on it.  
Gary also pointed out the importance of a good case ground on the ignition, so I will be installing a separate ground wire from the stator plate to the coil mount, stopping at a head fin along the way.

Andy
#14u
MOVMX, AMA, AHRMA

Thanks Mike.  I appreciate the opportunity you gave me by selling me the project.

I am making some slow progress, because I have had to re-do several things over; just didnt like the results the first time around.

I did buy aftermarket red side covers, but after some deliberation this weekend, I dug out the hammer/dollies and worked the aluminum airbox cover that you included with the bike, back into shape. Fits perfect now.

I also pulled out the fiberglass repair materials, and started in with plans to re-glass the right side cover.  I will make repairs on the backside using a combination of cloth, mat, and some chopped fibers, so I can re-use that original cover. The wear and tear on it looks great.

Not sure I will use it, but I liked the down low torque of my 74.5 Jackpiner so much that for this 250, I found a flywheel weight for the HPI ignition.  Testing will tell which route I go.



Thanks again.



Andy
#14u
MOVMX, AMA, AHRMA

Continuing on with the build of a 1974 250 hare scrambler / racer, not a restoration.  Made some progress, and incorporating alot of the ideas I read here. Going for as much reliability as I can get.






Andy
#14u
MOVMX, AMA, AHRMA

Larry is correct, Curnutt shocks.
They work pretty well, easy to maintain, rebuild and tune.  
The hard part is finding the right length and spring weight.

Andy
#14u
MOVMX, AMA, AHRMA

Thanks Ron, Larry and Gary for the help.
I plan to do just as Gary outlined.
One last pic for now...


Andy
#14u
MOVMX, AMA, AHRMA

Mike,
If you still have the 74 HS project, email me some pictures please.

And are you coming to the KC area anytime soon? (delivery).

email is AJ67SS00 at gmail dot com.

Andy
#14u
MOVMX, AMA, AHRMA

Mike,
If you still have the 74 HS project, email me some pictures please.

And are you coming to the KC area anytime soon? (delivery).

email is AJ67SS00 at gmail dot com.

Andy
#14u
MOVMX, AMA, AHRMA

I always enjoy talking with you guys at Mid O.

Andy
#14u
MOVMX, AMA, AHRMA

James; after thinking about it, (with all the other priorities i currently have) I would probably end up taking the motor to Mid Ohio this summer and selling it.  I will take some detailed pics for you to review and then we can talk.

Mike; thanks for the info.

Andy
#14u
MOVMX, AMA, AHRMA

Mick,
Similar tool for alot of shock bodies.  Works, Curnutt, etc.  Here is a pic from a Works Performance sheet that shows the tool.

Dont know that I have ever seen them sold anyplace.

I made one up like this out of scrap steel and a piece of steel pipe. Drill and tap for a 6mm bolt to index/hold the shock top.

Andy
#14u
MOVMX, AMA, AHRMA

Ditto to Kip's method.

But I always seem to use a good piece of 2x2 hard wood instead of the copper drift.

Andy
#14u
MOVMX, AMA, AHRMA