PUCH 250 SGS

Restoring a barn-fresh 1966 Sears Allstate

750 Norton Commando rebuild

Phil and Herb Becker

Herb, of Herb’s Garage

This winter I took my lump over to Herb’s Garage. Herb Becker that is, engine builder of the bike that won first place in the 2003  AHRMA’s Formula 750 races in Daytona.

I managed to talk Herb into a full rebuild on my engine. I was concerned about the off-idle knock, the general leakiness, and occasional smokiness of the engine. Perhaps he felt somewhat responsible for the bike as I bought it from him as a rolling basket!

Good news was the pistons and barrels were in great shape, they are already .020 over from some previous owner. It needed a crank grind and I had the dubious distinction of having the worst crank wear that Herb has seen. it was an even 30 thou down from what is normally a thou. The wear was even, not oval (?!). The shells were worn down to copper, barely a trace of Babbitt left on them.

I joked and said “I guess I shouldn’t have been taking it up to 6500!” Herb’s response was “You shouldn’t have been riding it!”

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CVMG Paris Rally: 2015

Another Paris Rally, great weather – here’s a few pics of what caught my eye this year.

 

 

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Paris CVMG Rally – 2014

This year we decided to bring a plethora of bikes in a cubevan. We thought we were being smart and prepared but of course wrangling children, bikes and getting out of town on a Friday afternoon was a bit challenging.

We managed to stuff into a cube van the following:

  • 3 x Norton Commando
  • 1 x Honda Ascot
  • 1 x Puch with sidecar

As other years it was a scramble to Paris and we arrived at the registration desk with 5 min to spare (7:55pm).

Here are a few photos to give a taste of the weekend.

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1974 850 Norton Commando

This beauty is for sale, 1974, 850 Commando.

  • New rubber, Avon Roadmaster TT100
  • New Boyer digital ignition – first kick start
  • Dual Amal carbs in good condition – steady low tick-over
  • lots of chrome
  • stainless fenders
  • recent paint
  • matching numbers
  • Steel tank
  • new battery

Will be at CVMG rally in Paris for sale!

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Amal tips

Amal - high speed modI had my Amal concentric carbs sleeved by Bruce Chessel of Woodstock ON – it was the best thing I’ve done for the bike. Sleeving the carb is actually a bit of a misnomer as it is the slide that gets sleeved, the body is just bored out and the slide is sleeved in brass to prevent galling from like metals.

I stumbled upon this service bulletin in a forum the other day and thought it worthy of reposting. My 750 commando is so thirsty at WOT that i need to open both fuel taps to keep the engine from stumbling – perhaps this will give a bit more top end?

Here’s a note from Dave Comeau (Atlantic Green Technical Services) when I was running 32mm carbs before I got the original 30mm Amals re-sleeved:

The ’70 model you show on your website, assuming it is the one with carb problem would not have originally been a 32mm. However that is not a big deal that they are not 30mm.
Your symptom of rough running at just off idle/light cruise is indeed….. cutaway.
Raising the needle will have more affect at bigger throttle settings.
If you have combat carbs with 3 cutaway, you will do better if you mod them to 3-1/2 or try them at 3-1/4 before you go all the way to the full 1/2.
IIRC each cutaway # is 1/16″ ,,,,,so a 3 cutaway is 3/16″
1/2 is 1/32″ custom 1/4 is 1/64″

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