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Spuds Porting and Tuning Thread


spudulike
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Started on Mattys 560XP, this saw had a crank stuffer break up and small parts of the stainless surround ended up taking out the piston and creating some damage to the strato and upper transfers.

 

He sent it in with a new piston which wouldn't slide up the bore down to the swelling of the material around these ports.

 

Sounds terminal but I stripped the transfer covers off, took the manifold off and then worked lightly with a diamond bur and managed to flatten the damage and followed up with a light hone to flatten the area.

 

The piston now slides in as it should and think we will get away with this.

 

Next job is to work on the forward facing transfers as there are a few angles there that would be better smoothed, flow likes smooth curves, angles cause turbulance:thumbup:

 

There are bulges in the mid transfer port which are extra material for the exhaust bolts - I will smooth this area and reshape the uppers.

 

The exhaust will get widened as will the inlet.

 

I am currently contemplating changing the strato system in to extra crank charge by modifying the intake area but will face this one once I have more info!

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spud, I've got a husky 61 (which I've just replaced with a 560xp) that won't run on its side and refuses to be tuned. I sent it to a local guy who put a carb kit in it when it came back it ran ok for a morning but then wouldn't tick over. I altered the tick over screw and she ran all afternoon. now she won't stand any revs as she just bogs down and conks out. I took it back to the chap who can't make head nor tail of it and he said sell it as a non runner. have you come across these symptoms before?

Cheers

tom

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