OutdoorKing Repair Forum Forums Repairs and Maintenance Questions On Chippers, Mulchers, Shredders & Stump Grinders Petrol Chippers, Mulchers & Shredders masport 5hp belt drive chipper shredder rebuild

Thanks all, for your help. The stepped crankshaft is a definite difference from the Masport to the Rover, but that crankshaft drawing certainly looks like mine, although my model no. isn't listed. Mine has a definite shoulder, shown in my earlier photos. I've attached a photo with that detail highlighted from the drawing. Is that the shoulder, or a bearing? Engine details are: Model 130902 Type 1260 01 Code 9109042. I have looked into these numbers online, and see that puts the engine manufacture as 1991.
Another point is that I took the blades to my son yesterday, who is well qualified and experienced in working with steel, and he said the blade material is definitely not spring steel, or even hard. It seems to be mild steel or close to it. That was a surprise,as it looked like spring steel.

I attempted to reply to your post Bruce, and I don't know where it went. It's on the site somewhere, so if you stumble across this somewhere, you'll know why:
Novice Registered: 24/12/12
Posts: 10
Loc: Macclesfield, Victoria, Austra...
Thanks all, for your help. The stepped crankshaft is a definite difference from the Masport to the Rover, but that crankshaft drawing certainly looks like mine, although my model no. isn't listed. Mine has a definite shoulder, shown in my earlier photos. I've attached a photo with that detail highlighted from the drawing. Is that the shoulder, or a bearing? Engine details are: Model 130902 Type 1260 01 Code 9109042. I have looked into these numbers online, and see that puts the engine manufacture as 1991.
Another point is that I took the blades to my son yesterday, who is well qualified and experienced in working with steel, and he said the blade material is definitely not spring steel, or even hard. It seems to be mild steel or close to it. That was a surprise,as it looked like spring steel.

Ronn,

Does the top part of the blade holder boss only go up to the step in the crankshaft or go over it?

Also it appears that the cutter system might have been made up if you are saying that it is not hardened steel and I would assume that you would have some vibration when running.

The uppermost blade rests under that shoulder, which I've just found is actually a loose ring giving clearance between the top of the blade and the four engine mounting bolts. That suggests that it would be a machine part rather than an engine part, doesn't it?

Ronn,

It suggest to me that the cutter system does not appear to be original and a made up one especially the welding to the blades.

I have got the machine back together, having rebuilt the blades. I started it today, for the first time; it was a bit hard to start, and would initially only run on part choke. Eventually it would run on throttle only, but at pretty well full revs only. It all suggested the need for a carby tune up to me. Can you help please Bruce, either with instructions, or a link. The engine again is B&S 130902 1260 01, vertical shaft with tank mounted carb.Many thanks.

(When I say tune up, I'm meaning mixtures)