Weight difference between 360 auto and 125 motors

Today I decided to take the motor out of my 78 125CR and swap in a fresh 360 auto motor. Got tired of having to put new piston and ring in the 125 each season. Before installing the 360 auto I decided to weigh it and the 125 motor. The 360 auto motor complete with mikuni carb and motor mounts weighed 74 lbs. The complete 125CR motor with Bing carb and motor mounts was 58 lbs. That is a weight gain of 16 lbs. I didn't weigh the difference between the exhaust pipes.

Just food for thought.

Marty

The auto and four stroke have aluminum cases where the standard shift two cycle ones have magnesium. At least in the years I have dealt with. Cast magnesium alloy to be more precise.

Yea it was no surprise to me either but actually I thought the weight difference would have been even more. When I road the 125 I always had the motor pinned just to haul my 185lb body. The great thing is that I think with the 360 auto motor the bike handles even better due to all the weight being down low.

Marty

But you will certainly have to do more than replace a set of rings every season!!

Was your 125 ported?

No It was the original porting

Actually it was piston and rings and sometimes a bore job. The only way the 125 made good power was when it was fresh. When I would freshen up the top end and after about 3-4 tanks full of gas I could feel the power start dropping off. Like I said before on the 125 motor the throttle is almost always pinned. I guess if I ever weighed 125-130 lbs again (never going to happen) then the 125 would have enough power. I love the autos and I don't seam to have problems with them like many other people do.

Marty

I've always have heard that the Husky 125's were soft. Don't quote me but I think Mitch Payton had a good port job, he did on them?

I never had many problems once I got used to them but part of that was too have a strict maintenance regime! I appreciate your need to keep refreshing your top end. When I first raced in the 70s I had to replace the rings on my 250 Stormer every 3 or 4 meetings, even a mugwump like me could feel the motor losing its edge!

I have a 1973 WR125 and it is a slug. LOL

I have an email out to Eric Gorr to see if he has done some porting to them in past. Too bad someone doesnt have a template out and about from Pro circuit.

Thats why I raced an 80 YZ125. Wasn't a ton of Husky 125's out there.