Quote:
Originally Posted by gasgasman
Yes, the flapper can be put in upside down.
The arched part of the flapper should be facing the exhaust port.
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Quote:
Originally Posted by gasgasman
The step should face up.
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I'm putting my 300 back together.
I thought I marked the power valve flapper but I cant see it now.
I read some bad experiences with ruining the engine if its in wrong.
The first post says 'arched faces exhaust port'.
I see that one side has concave and tapered cut. I am assuming this is the 'arched face'.
The second post says the 'step should face up'.
The step is one the other side of the flapper, the side opposite the concave arched side. But if that faces up then the arched faces away from the port.
I am confused and nervous.
There is a long slot on the side that the rod from the cams goes thru.
With the arches facing into the engine head, towards the exhaust port, the taper runs uphill from the end of the arch, that is the opposite end of the fixed pivot rod.
If I flip it so the step faces up then the slot runs downhill as you go towards the fixed pivot rod.
Which way is correct?
From the diagram of the pv it seems that the arched faces into the head, the slot goes uphill towards the pivot pin.
I'm going to work on the forks and hope someone can help me out.
I cant afford a blown engine.
Thanks
UPDATE.......................
I tried it both ways.
I think I was reading the posts wrong.
In the 'wrong' way the flapper hardly moves.
In the 'right' way it moves a lot.
The "step" side faces up as you look down the bore and the arched/concave side faces out towards the exhaust system.
I was thinking the arched faced into the engine but this is wrong.
So when its in the 'right' way, and open all the way up, the arched side gets hit by the exhaust gases.
I am looking for feedback still though.
Thanks