Joe Hunt magneto photos (2012)

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willh said:
comnoz, Jim, Ken,

What would you charge for welding an early 750 rear timing section on an 850 MKIII case or other 850? Provided that the costumer furnished the to-be-modded case and donor case, for the mod.
Curious and assume others would like to know.
Click to expand...

I think its better to just match the Atlas or early 750 case with the 850 drive side to get the rear mount magneto. It would be less work and no welding - minimal machining and maybe some hand work. Check crank end play. Then have someone mill off the deck so its flat. Flexible superblends help because perfect alignment is not necessary. I haven't checked everything but I've got some similar cases here that I've looked at and it seems do-able. But you must be very careful about using the correct timing cover with the right side case or an oil hole can be exposed and there will be no oil pressure.
 
jseng1 said:
willh said:
comnoz, Jim, Ken,

What would you charge for welding an early 750 rear timing section on an 850 MKIII case or other 850? Provided that the costumer furnished the to-be-modded case and donor case, for the mod.
Curious and assume others would like to know.
Click to expand...

I think its better to just match the Atlas or early 750 case with the 850 drive side to get the rear mount magneto. It would be less work and no welding - minimal machining and maybe some hand work. Check crank end play. Then have someone mill off the deck so its flat. Flexible superblends help because perfect alignment is not necessary. I haven't checked everything but I've got some similar cases here that I've looked at and it seems do-able. But you must be very careful about using the correct timing cover with the right side case or an oil hole can be exposed and there will be no oil pressure.
Click to expand...
Thanks for the wisdom.

I assume the difference in 850MKIII case regarding the wider crank is on the drive side so no difference in the bearing area of the timing side compared to early 750. If not, I guess I should have kept my old 750 crank.

Thanks again.
 
willh said:
I assume the difference in 850MKIII case regarding the wider crank is on the drive side so no difference in the bearing area of the timing side compared to early 750. If not, I guess I should have kept my old 750 crank.

Thanks again.
Click to expand...

Fraid not. The bearing bores in both case halves are wider apart to accomodate the wider crankshaft. When you fit an earlier crankshaft to the MKIII cases you have to fit spacers behind both the main bearings.

Ken
 
The MK3 crank and cases are .120" wider than the MK2 and earlier. I know because I modified a MK3 crankshaft to fit a MK2 crankcase.
 
willh said:
Back to welding...how much$?
Click to expand...

Much easier to find a pre MK3 crank, match the 850 case to an Atlas case, and shim the drive side main bearing as necessary. .
 
jseng1 said:
willh said:
Back to welding...how much$?
Click to expand...

Much easier to find a pre MK3 crank, match the 850 case to an Atlas case, and shim the drive side main bearing as necessary. .
Click to expand...
Lighter weight crank as a bonus....wish I hadn't sold my Atlas crank....
 
Joe Hunt magneto photos (2012)

just curious, what mag is that? Forerunner to the ARD? Looks like a Karata top.
 
Not something I've seen before, but it wouldn't be a Karata. They weren't in business yet at the time of the picture.

Ken
 
willh said:
Back to welding...how much$?
Click to expand...


I have welded up a few cases and re-machined for a Mag so I have the jigs. I recently finished a set of Maney cases. It takes about $400 to $450 labor weld in the needed material and machine it.

I tried to post some pictures but due to some kind of conflict between Mozzilla and Adobe my pictures will not upload. Jim
 
comnoz said:
willh said:
Back to welding...how much$?
Click to expand...


I have welded up a few cases and re-machined for a Mag so I have the jigs. I recently finished a set of Maney cases. It takes about $400 to $450 labor weld in the needed material and machine it.

I tried to post some pictures but due to some kind of conflict between Mozzilla and Adobe my pictures will not upload. Jim
Click to expand...
So no donor 750 cases be harmed?
Love to see your work, can you PM the photos to me and I'll put them up?
Thanks
Will
 
Very nice, Jim. Much neater than the conversions HPI did. He used to grind the corner of the mag instead of machining out the back of the cases to clear. You can see where he ground into the threads on this ARD mag for clearance.

Joe Hunt magneto photos (2012)


Ken
 
Not that I have heard but after 9 years on the side of my Norton my JH is still working as good as the day I put it on, haven't touch it and still firing up on the first kick every time, how many ignition systems work so well like the JH, I still have the same point in it and still has survived a few slides down the road in its first years on the bike, I haven't touched the timing every thing is the same as the day I put it on.

Ashley
 
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