Originally Posted by Chris
19" is the pitch BTW the diameter will be around 14".
19" on a 150 on that hull should be on the money. So it sounds like you have to work through a few issues. Things to check are.
- Fuel flow from the tanks is good, i.e. no restrictions and the tanks are ventilated correctly. Does the primer bulb remain firm after running the engine or does it suck in. This is a sure indication of poor fuel flow.
- Spark Plugs are new and gapped correctly.
- Check the throttle butterfly valves to make sure they are opening fully at WOT.
- Check carbs are clean and no debris, might be worth getting these cleaned by your local mechanic with an ultrasonic cleaner.
- Carbs will need balancing if they are stripped so you need to get this done.
- Finally taking the heads of these engine is not difficult and you can then look at the bores to make sure they are smooth.
Cheers Chris, sorry yes the prop is 14 1/2 inch, 19 pitch.
Ran 2 can of sea foam through the engine, and it's kicked out loads of crap, and incidentally my Compression tester spring a leak mid way through testing!!! Really hoping it's just a dodgey tester, I also checked the motor when I bought it and ideas sure all cylinders were around 100 also, so fingers crossed.
As for the Bendix shaft ive no idea yet how to get at it without removing the flywheel cover which I believe disturbs the timing? Have a seloc manually which im slowly working my way through.
Fuel flow seems good, bulb isn't rock solid, but it's not sucking in in the slightest.
Plugs again are new this week and gapped good.
Got someome with a ultrasonic cleaner so may see him aboit getting the carbs cleaned and find someone to balance them.
If the compression is still low once I've got another gauge I'll whip the head off and see what's going on, got a feeling they've been off before though, in the manual it states they're sealed with an O-ring, yet these I can see gasket sealant squashed out around the sides.