Intermitant "knocking" at idle-SWM 320

[Bigem]

Okay two-smoke guru's, I may have a small problem.

I was plonking around the backyard on Saturday arvo on the 82 SWM320 when the throttle went all "limp". The throttle cup had decided to break which itself was not a problem as I had a new spare Domino setup on my desk.

I swapped broke for new and away I went again.

After 15-20 minutes I stopped to move one of my "obstacles" back into place and I noticed a "knocking" coming from the engine.

It was not constant. Very intermittant. It might just be that the idle is a bit lower now but I am thinking more along the lines of maybe a bit too much side play between the conrod and crank allowing a "knocking" sound from the side to side movement??

Has anybody else come across this before or am I possibly worrying about nothing?

I intend to pull the top end off and have a look and maybe throw a new piston and rings in while the UK pound is weak anyway, so does anybody have the tolerances for an SWM320 engine?

[Mad Dog]

G'Day Bigem, Not sure about the knocking noise but contact Peter Knight at [email protected] there's not much he doesn't know about your engine & he will also have any parts you might need. He was more than helpful when I rebuilt my red & white 320, just quote your engine number & he will know exactly what you have.
Cheers Dave.

[Bigem]

Thanks Dave.
I have not had a chance to look at it since last weekend so hopefully I can tomorrow.
When I replaced the throttle assembly, the idle dropped a bit so I am hoping that's exagerating the issue.
If it doesn't "fix" it, I will chase up Peter Knight and pick his brain.
Thanks again mate, much appreciated.

Andrew