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My Cousin's Honda Generator #4456078
07/11/17 09:27 AM
07/11/17 09:27 AM
Joined: Dec 2015
Posts: 45
Kansas
locomaster1969 Offline OP
locomaster1969  Offline OP
Joined: Dec 2015
Posts: 45
Kansas
So my Cousin brought his Honda generator down along with the new to him travel trailer he had bought. It's a nice trailer with 2 slides, heat pump, AC, tiled floors, etc. He brought it down so we could give it a good look over before he took it on a trip. He brought along his generator which I believe is a Honda EB 4500 with electric start. The trailer checked out ok but his darn generator would die after running maybe 7 minutes. It would restart but it was running as if it were starving for fuel and getting worse every time we started it. The engine began to backfire, miss out, the exhaust smelled of gasoline. Hmmm. So I tell cousin he can use my gen set which is the same Honda as his minus electric start and I will get his going for him while he is on his trip.

I'm thinking we have a fuel restriction or dirty carb with a bad float along with a possible bad coil. I bought a used Honda rear tine tiller off Craigslist and had ordered a new carb, coil, spark plug, and air filter for 21 bucks as the carb choke and fuel tabs were broken off the tiller. So i have a few spare parts for the gen set. Anyhow the carb was clean, no dirt at all but I still cleaned out the carb and emulsion tubes. Float was good. I checked the sediment bowl at the petcock and it was clean. I replaced the fuel line as I suspected a pin hole and the line was stretchy from alcohol in the fuel anyway. Fired it up and still the same problem. OK so now I'm going to pull everything off and replace the coil. I remove the coil and I see no cracks or issues other than a bit of rust which is cosmetic. My spare coil wont fit as it is too small. I clean up the coil and put it back on. I fire it up and still the same thing. So I'm thinking it's the coil. Gotta be the coil. It gets hot and quits making spark or not enough spark.

I decide to swap out the spark plug just to see if that corrects the issue. The plug is an NGK BPR5ES. It is a well used plug. Covered in rust at the base but the gap is almost spot on. I put in the only spare plug I have which is a Chinese plug. After 3 pulls the engine fires up and runs and runs for an hour. Of course I put a load on the gen set and it works like it should. I'm happy. I turn off the gen. I try to restart it and it wont. GRRRRR!!! Smells like it is flooded. I use the electric start. It cranks for 10 seconds then fires up!!! Darn Chinese spark plugs!!! So I go into town and buy a few NGK plugs. Put one in the Gen set and now everything is good!!! It starts every time!!!

I called my Cousin and report the good news. He says he has owned the Honda for at least 15 years and never replaced the plug. Just cleaned the plug and checked the gap from time to time. I then recall that my Stihl chainsaw was 13 years old when the NGK plug quit working. Who would have thought a spark plug would cause the engine to run like it was. I thought spark plugs either worked or didn't with no in between. Anyway I'm not saying NGK plugs are bad. NGK plugs are what seem to last the longest and work best in small engines and in my motorcycle. Of course I did change out the oil in the genset cause thats what BITOGS do. Dumped out dark but still serviceable oil and refilled with Dello 15/40. I grabbed a NGK plug and taped it up in the box and taped it to the frame of the genset. Now it's good to go for another 15 years with a spare plug on hand just in case.

Last edited by locomaster1969; 07/11/17 09:29 AM.

1986 Yamaha Venture
2000 Honda Accord V-6
2004 F-150
Small engine sales and repair
Re: My Cousin's Honda Generator [Re: locomaster1969] #4456086
07/11/17 09:36 AM
07/11/17 09:36 AM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 5,123
Houston, Texas
I didn't know they made Chinese plugs. I've only had a spark plug cause an engine to not start one time. Chunk of carbon stuck in between the electrode.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: My Cousin's Honda Generator [Re: locomaster1969] #4456088
07/11/17 09:37 AM
07/11/17 09:37 AM
Joined: Mar 2009
Posts: 164
SW Louisiana
EricG Offline
EricG  Offline
Joined: Mar 2009
Posts: 164
SW Louisiana
I have found that most of the small engine malfunctions that I deal with are caused by the spark plug. Especially if the unit has recently been running good and just wont start. NGK are my "go to" plug!


11 F150 4x4 5.0
11 Cadillac SRX
03 Century
95 K1500
94 Tercel
Re: My Cousin's Honda Generator [Re: EricG] #4456106
07/11/17 10:03 AM
07/11/17 10:03 AM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline
maverickfhs  Offline
Joined: Dec 2016
Posts: 2,203
VA
Originally Posted By: EricG
I have found that most of the small engine malfunctions that I deal with are caused by the spark plug. Especially if the unit has recently been running good and just wont start. NGK are my "go to" plug!


How can I find a NGK for champion rj19lm plugs?


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: My Cousin's Honda Generator [Re: locomaster1969] #4456107
07/11/17 10:04 AM
07/11/17 10:04 AM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline
maverickfhs  Offline
Joined: Dec 2016
Posts: 2,203
VA


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: My Cousin's Honda Generator [Re: EricG] #4456140
07/11/17 10:28 AM
07/11/17 10:28 AM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
USA
Originally Posted By: EricG
I have found that most of the small engine malfunctions that I deal with are caused by the spark plug. Especially if the unit has recently been running good and just wont start. NGK are my "go to" plug!


Ditto.


Multiple Diesel and Gasoline vehicles
Re: My Cousin's Honda Generator [Re: locomaster1969] #4456415
07/11/17 02:46 PM
07/11/17 02:46 PM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
Boston, MA
Originally Posted By: locomaster1969
So my Cousin brought his Honda generator down along with the new to him travel trailer he had bought. It's a nice trailer with 2 slides, heat pump, AC, tiled floors, etc. He brought it down so we could give it a good look over before he took it on a trip. He brought along his generator which I believe is a Honda EB 4500 with electric start. The trailer checked out ok but his darn generator would die after running maybe 7 minutes. It would restart but it was running as if it were starving for fuel and getting worse every time we started it. The engine began to backfire, miss out, the exhaust smelled of gasoline. Hmmm. So I tell cousin he can use my gen set which is the same Honda as his minus electric start and I will get his going for him while he is on his trip.

I'm thinking we have a fuel restriction or dirty carb with a bad float along with a possible bad coil. I bought a used Honda rear tine tiller off Craigslist and had ordered a new carb, coil, spark plug, and air filter for 21 bucks as the carb choke and fuel tabs were broken off the tiller. So i have a few spare parts for the gen set. Anyhow the carb was clean, no dirt at all but I still cleaned out the carb and emulsion tubes. Float was good. I checked the sediment bowl at the petcock and it was clean. I replaced the fuel line as I suspected a pin hole and the line was stretchy from alcohol in the fuel anyway. Fired it up and still the same problem. OK so now I'm going to pull everything off and replace the coil. I remove the coil and I see no cracks or issues other than a bit of rust which is cosmetic. My spare coil wont fit as it is too small. I clean up the coil and put it back on. I fire it up and still the same thing. So I'm thinking it's the coil. Gotta be the coil. It gets hot and quits making spark or not enough spark.

I decide to swap out the spark plug just to see if that corrects the issue. The plug is an NGK BPR5ES. It is a well used plug. Covered in rust at the base but the gap is almost spot on. I put in the only spare plug I have which is a Chinese plug. After 3 pulls the engine fires up and runs and runs for an hour. Of course I put a load on the gen set and it works like it should. I'm happy. I turn off the gen. I try to restart it and it wont. GRRRRR!!! Smells like it is flooded. I use the electric start. It cranks for 10 seconds then fires up!!! Darn Chinese spark plugs!!! So I go into town and buy a few NGK plugs. Put one in the Gen set and now everything is good!!! It starts every time!!!

I called my Cousin and report the good news. He says he has owned the Honda for at least 15 years and never replaced the plug. Just cleaned the plug and checked the gap from time to time. I then recall that my Stihl chainsaw was 13 years old when the NGK plug quit working. Who would have thought a spark plug would cause the engine to run like it was. I thought spark plugs either worked or didn't with no in between. Anyway I'm not saying NGK plugs are bad. NGK plugs are what seem to last the longest and work best in small engines and in my motorcycle. Of course I did change out the oil in the genset cause thats what BITOGS do. Dumped out dark but still serviceable oil and refilled with Dello 15/40. I grabbed a NGK plug and taped it up in the box and taped it to the frame of the genset. Now it's good to go for another 15 years with a spare plug on hand just in case.
+1 on the NKG. They used to be OEM on SAABS until GM blew up the company.

Re: My Cousin's Honda Generator [Re: locomaster1969] #4685664
03/05/18 08:33 PM
03/05/18 08:33 PM
Joined: Oct 2003
Posts: 242
NJ
crainholio Offline
crainholio  Offline
Joined: Oct 2003
Posts: 242
NJ
This post was a big help following last Friday's snow storm. Our Honda EU3000is developed the same symptoms...initially ran fine cold, but then backfired and died as it warmed up. No extra choke needed to keep it running smoothly during warmup so it was getting fuel mix correctly, and I could flip Eco Throttle on & off with nice smooth engine response. Until it warmed up, at which time any load or flipping Eco from on to off...any abrupt increase in throttle...would cause it to backfire a few times and die.

I removed the sediment cup and carb bowl thinking fuel starvation, both were clean. Tried draining the gas and refilling with new 93 octane gas, same problem. Removed the NGK BPR5Es spark plug, installed a new one gapped at 0.030 (old one was at 0.029x, just a hair under the 0.030" mark), and no further problem. It was the factory plug with somewhere between 240-280 hours of run time including 12 days post-Sandy 2012. Probably should have replaced it as preventive maintenance.


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