Generator won't start, just sputters and backfires
#1
Member
Thread Starter
Join Date: Dec 2013
Location: usa
Posts: 5
Upvotes: 0
Received 0 Upvotes
on
0 Posts
Generator won't start, just sputters and backfires
Hello,
I have a Generac 3500 (4375 max) with a GN 190 6.5 hp
I replaced the carb and spark plug. when I pull rope, I get a 2-3 coughs or a flame out of carb. I've tried spraying carb cleaner into carb, but same results.
I have read bits about flywheel, key, timing etc. but would like more info and things to check.
Thank you greatly for any assistance.
I have a Generac 3500 (4375 max) with a GN 190 6.5 hp
I replaced the carb and spark plug. when I pull rope, I get a 2-3 coughs or a flame out of carb. I've tried spraying carb cleaner into carb, but same results.
I have read bits about flywheel, key, timing etc. but would like more info and things to check.
Thank you greatly for any assistance.
#2
Shut the fuel off. Remove the bowl then turn the fuel back on to see if fuels making it to the carb.
Lift the bowl to see if the fuel shut off.
Checked to see if there's a filter in the tank?
Lift the bowl to see if the fuel shut off.
Checked to see if there's a filter in the tank?
#3
Member
Thread Starter
Join Date: Dec 2013
Location: usa
Posts: 5
Upvotes: 0
Received 0 Upvotes
on
0 Posts
Ok, I turned fuel off, dropped the bowl, turned fuel on, and fuel ran out. lifted the float and fuel stopped flowing out.
I'm not sure about any fuel filter in or on tank, but there wasn't one on the fuel line. I installed a filter on the fuel line itself a few days ago.
I'm not sure about any fuel filter in or on tank, but there wasn't one on the fuel line. I installed a filter on the fuel line itself a few days ago.
#4
Member
Join Date: Dec 2009
Location: bond county illinois
Posts: 158
Upvotes: 0
Received 0 Upvotes
on
0 Posts
It sounds to me as if you have a timing issue which means the flywheel key is probably sheared. I would check that and also it could be a valve problem. If it has overhead valves take off the valve cover and see it the push rods etc. are in place.
#5
Member
Thread Starter
Join Date: Dec 2013
Location: usa
Posts: 5
Upvotes: 0
Received 0 Upvotes
on
0 Posts

Is there a kit I can buy to replace the springs and/or push rods?
#6
You can replace this without removing the head if you connect an air compressor hose to the spark plug hole and pressurize the cylinder. Usually this is done using the hose from a compression gauge. This holds the valve up so that it won't drop down into the cylinder when you remove the retainer. Compress the spring and using a small magnet, pull the valve retainer clips out of the groove. Then let the spring loose and replace the broken retainer and reverse procedure to put it back together.
#7
Member
Join Date: Nov 2014
Posts: 1
Upvotes: 0
Received 0 Upvotes
on
0 Posts
Oil
Thanks for the posting. I had a similar problem with my Wen 3500. I checked the valves and springs under the valve cover and could see nothing wrong. I decided to change the plug to see if that would matter. While checking my user's guide for gap size, I found a sheet of paper that said that the generator needed to be filled with oil before use. I may have done this 5 years ago when I bought it but I am ashamed to say that I haven't checked it since. Like ever. So when I went to check it, and found that it was empty/low, I noticed a small wire coming out of the crankcase. This generator must be smart enough to know when a bone-head like me doesn't put oil in it and it refuses to start. Before adding oil it back-fired, sputtered, and acted like it wanted to start but just wouldn't. I Added oil (20 ozs for this model) and it fired up the first pull.