Short blasts of wd 40 oughta do it. The propane will jack the idle up. But, the reason I say short blasts is, wouldn't want the propane going in the intake thru the filter, cuz it willl jack the idle there too. I GUESS it will raise the idle. Might knock it down? Either way. You spray & idle changes? Leak found, right?

he's right about that starting fluid. Very easy to determine that way. It's a better choice. If you have wd 40 handy try that. If you have starter fluid, try that.If WD 40 is inconclusive, starter fluid at Wal_Mart is Cheap. I keep a couple cans around for the backhoe. It's also a great lot of fun to eliminate a swarm of little bugs in the evening. Just squeeeze the trigger & light the lighter. MAJOR whooossshhh... NBOTE*** KIds, do not try this at home. or anbody elses home.  I do not recommend this to anyone.. LOL,, you know what I mean..

Steve530 wrote on 12/31/69 at 16:00:01:


What if you get spark from somewhere else   while doing this. I'll stick with starting fluid.

Steve530 wrote on 12/31/69 at 16:00:01:


SavageDude wrote on 12/31/69 at 16:00:01:


The ether in starting fluid has a much lower flash point, is more toxic and a lot more dangerous than the propane. For leak finding, I'd stick to the propane over the WD-40 becuase it isn't going to make a mess.

The ether type starting fluid was developed for starting diesel engnes and is really hard on lower compression gas motors.

Here's a tip: I've found that WD-40 is an excellent starting fluid for gasoline engines, and burns slower instead of 'exploding' in the cylinder. IMO it is much less likely to cause engine damage. Great for starting a stubborn lawn mower or cycle. If you are trying to decie whether and engine won't run because of lack of fuel, or no spark, a squirt of WD-40 straight into the carb, and an attempt to start, will answer your question real fast.