Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
If you remove the kill wire from the on/off switch will engine start?
Same if you remove the kill wire from the coil? Coil and magnet is all that makes the spark!
is this with new spark plug?
Maybe spark is ok. If you out a teaspoon of fuel into the spark plug hole, re-install spark pug, will engine start?
Have you removed the fuel bowl and checked for water or debris in the fuel bowl? Common problem on pressure washers!
Have you checked compression? Hold finger with rag over spark plug hole, and see if it has enough compression to move your finger.
How are you checking for spark? Plug grounded to the metal of the engine?
Spark seems weak, but coil and plug and kill wire has been checked or replaced. Will not fire with fuel in the spark plug hole. That only leaves the timing between the flywheel and the crankcase key.
Or the valves are not moving!
OK< I will opt out. Sorry. maybe someone else will have seen this.
Hi, my name is***** will be assisting you.
I have read the prior conversation in regards ***** ***** issue and it sounds like you have covered just about everything that could be an issue however I have seen a large number of these engines especially mounted on power washers that have this issue and you will normally find the problem to be the crankshaft gear that actually turns the cam. The original crankshaft gear was made of a composite or plastic material which did not hold up well in power washer applications, it would strip the locator key that was molded as part of the gear and then would let the gear spin free on the crankshaft and no open and close the valves properly. If you watched the valves as you slowly turned the engine over it appears that everything was working okay but if you pull the rope quickly as if you are trying to start the engine you would find that the valves are not operating at all due to the crankshaft gear slipping on the crank. I had this happen to my own personal power washer as well, I had been using it everything was fine no problems, shut it off, went to use it again a couple days later and it would not start, this is exactly what I ended up finding wrong with my unit as well as a large number of others that I had come into the shop for repair.
In order to repair this you will have to take the engine off of the machine, remove the lower oil pan from the engine. Once you have done this you will have access to the crankshaft gear and you can then remove the old gear and replace it with a new gear. The new gear is cast rather than composite. Briggs part # 797521.
I hope that this information helps you.
Thank you it has been a pleasure to assist you.
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Make certain that if you are doing this repair that when you reassemble the crankshaft gear that the timing marks on the crank gear and the camshaft gear are aligned prior to putting the lower oil pan back on, this is what actually times the engine.
When you pull the rope quickly as if you were trying to start the engine?
I have seen this happen on a large number of these engines.
Everything else looks good in basic checks but the engine will not start even when you spray carburetor cleaner or fuel into it.
The only other thing that would cause a no start in that case is a bad or weak ignition coil.
What is the ignition coil clearance set at between the coil and the magnet on the flywheel?
I don't have any other suggestions for you. It sounds like you have checked everything that could cause the problem.
Even though it is a new coil it could still be bad however.
I am still thinking that it is the crankshaft gear that is causing your issue because I have seen it happen a lot on this engine mounted on power washers.
I will opt out which will allow for one of the other experts here to add and comments if they have other suggestions.
Hello my name is ***** ***** of the things i would do if this came to my shop.. Check the valves to make sure they are in the right spec. I would also do a leak down test it may be that the valve isnt 100% close.. causing no room for compression to run.. if everything is ok..
You remove the head and looked at the face of the valves?
I have seen you have might have compression but if you do a leak down test you will see there is a valve not closing 100% so you might have to lap the valves.. All the timing is good?
ok fair enough.. I didnt know it was new..
I will opt out cause if you are getting spark, fuel and compression.. all should start.. Good luck