1948 Monark

Oldbiscuit

Well-Known Member
Here’s a couple of pics of my first motorized build. I found this 1948 Monark frame, springer fork and crankset at a flea market. It was beyond restoring so I decided to make me a board track racer instead. It’s a hoot to ride and gets a lot of compliments.
 

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Wow, I thought I was having all kinds of problems for a while. I had a slight dead spot mid throttle, so I adjusted my needle and it seemed to make matters worse. So I got my jet kit out and kept trying different jets, one step at a time. Kept getting worse. Pulled the plug, cleaned inspected, regaped it made it even worse. Finally realized I had the stock CDI on it and never put the performance one that came with the bike on, so I swapped it out, rejected it back to my original settings and ... Wow it runs like a screaming banshee again !!’
 
There's an old saying among mechanics, "Most carb problems are electrical in nature." On 2 strokes I look at the electrical and case leaks first, on 4 cycle electrical and then go to the fuel system. Of course there are obvious exceptions that point to specific solutions, a motor with weak or no compression is an example and in that case electrical system & carb remedies go to the bottom of the solution bucket. Adequate spark, fuel and compression are still necessary checks to run prior to part swapping.

The stock kit CDI's work pretty well but are not great quality and I've had them fail back to back on a couple of occasions; new and right out of the box.

Glad you spotted the problem. It's way more fun to ride than fix.

Rick C.
 
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