Isa4325
Petty Officer 2nd Class
- Joined
- Oct 7, 2017
- Messages
- 121
Isa.... the two hoses you point at are lines for the pulses from the crankcase which makes the pump to work.
The fuel pump has two stages hose 1 and hose 2 and it takes the pulses from the crankcase (underpressure/overpressure) to flexing the pump diaphragm forth and back.
If fuel comes out hose 1 when you prime the bulb then the diaphragm is bad..
Not possible the flywheel should be 180 dgr out of TDC.
Sometimes you have to readjust the timing marker plate if it has be off the block after a rebuild or soo.
The plate will be adjusted from the #1 piston at TDC, this is always the reference.
BTW you do not adjust the timing at 0 dgr TDC.
Always set the timing at WOT 30 dgr (or 32 dgr from manual) then the timing at idle will be what ever 2-5 dgr, it depends on the advance of the timing at idle (how much you need to open the throttle up to achieve a good idle speed).
Really odd ????????
#1... top cylinder?
Does the flywheel have a 0 dgr mark made from factory? or is it a home made mark?
It does not matter if the flywheel is from a 4 cylinder engine, top cylinder is #1 on those too.
As for using the engine it does not matter BUT you have to know that the 0 mark is NOT the 0 mark (TDC #1 cylinder).
Make your own 0 and 32 dgr mark, it will help you in the future and not confuse when checking the timing.
Just came up in my mind.
Has the flywheel the 0 mark at the outer rim (teeth for the starter)
The outer rim (teeth) is press fitted to the flywheel and it may have moved for some reason.
Change the plug wires around.
Sometimes fuel build up can cause a backfire.
Sometimes a vacuum leak causes a backfire.
The intake port covers need silicone to make sure they don't leak.
The last rebuild I did the motor coughed when trying to start.
It wasn't much but it blew 2 intake port side covers gaskets.
I saw a piece of one gasket, that's how I knew something was wrong.
It went from a small cough to a major backfire when the gaskets blew.