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spark plug issue ???

#1

T

torey69

I have a Tecumseh OHV17 204604R (H) and have a very hard time starting it. I have put a new carburater kit in it along with new starter and solenoid but still have a heck of a time starting it. I can get it started with ether but I was wonder if someone could tell me the right spark plug number that should be in it. The spark looks weak so that is my next step. Help please.
Thanks
Torey


#2

briggs

briggs

torey69 said:
I have a Tecumseh OHV17 204604R (H) and have a very hard time starting it. I have put a new carburater kit in it along with new starter and solenoid but still have a heck of a time starting it. I can get it started with ether but I was wonder if someone could tell me the right spark plug number that should be in it. The spark looks weak so that is my next step. Help please.
Thanks
Torey
Click to expand...


Champion Spark Plug (RN4C) I would check the valves also


#3

davbell22602

davbell22602

NGK BR7ES, Bosch W5CC, Champion RN3C or Autolite 4055


#4

briggs

briggs

davbell22602 said:
NGK BR7ES, Bosch W5CC, Champion RN3C or Autolite 4054
Click to expand...

not sure why I got the rn4c I looked it up might be a miss print


#5

Fish

Fish

Try draining the tank and carb and refilling with fresh fuel from the gas station, old gas doesn't start very well, and gas bought in summer is formulated different as well,
so stabilizer doesn't matter. Winter fuel formulations vaporize/start at lower temps.


#6

reynoldston

reynoldston

torey69 said:
I have a Tecumseh OHV17 204604R (H) and have a very hard time starting it. I have put a new carburater kit in it along with new starter and solenoid but still have a heck of a time starting it. I can get it started with ether but I was wonder if someone could tell me the right spark plug number that should be in it. The spark looks weak so that is my next step. Help please.
Thanks
Torey
Click to expand...

What does a weak spark look like and how did you test for spark? If it starts with starting fluid I would think fuel problem more then spark. Check the choke operation and then fuel pump.


#7

liljohn

liljohn

Make sure the plug is gapped rite.


#8

R

Rivets

According to my Tecumseh manual all of their OHV engines take an RN4C plug. I do not stock or have ever used an RN3C.


#9

davbell22602

davbell22602

Rivets said:
According to my Tecumseh manual all of their OHV engines take an RN4C plug. I do not stock or have ever used an RN3C.
Click to expand...

I got RN3C from the cross reference in the Stens catalog.

Autolite site says 4055. When cross referencing that on the Champion site. It says RN3C.


#10

Fish

Fish

As long as the tip length is the same, don't worry about it much. For years Tecumseh called for a J17LM, but the J19LM was used as well. Slightly higher heat range.


#11

R

Rivets

Daveb the manual I used was the last one that came out just before they went under. It also covers all the OHV engine Tecumseh produced. You're telling me that the spark plug companies override the OEM. Stens isn't even a plug manufacturer. As Fish said, you can use other plugs as long as the length and tip are the same and the heat range is close. I would follow the OEM first unless there was no other available, or a cross to another major plug producer, not distributor. Just my opinion, as I'm just an old fart who has forgotten more than he knows and likes to make trouble.


#12

davbell22602

davbell22602

Rivets said:
Daveb the manual I used was the last one that came out just before they went under. It also covers all the OHV engine Tecumseh produced. You're telling me that the spark plug companies override the OEM. Stens isn't even a plug manufacturer. As Fish said, you can use other plugs as long as the length and tip are the same and the heat range is close. I would follow the OEM first unless there was no other available, or a cross to another major plug producer, not distributor. Just my opinion, as I'm just an old fart who has forgotten more than he knows and likes to make trouble.
Click to expand...

Why wouldnt a plug manufacturer override a OEM spec? Plug manufacturer knows about the plug than OEM would.


#13

R

Rivets

Maybe because the manufacturer designed the engine. But, an equipment dealer knows more than the retired old teacher so I'll say what you want to hear. You're right, I'm wrong and goodby.


#14

briggs

briggs

I use JLM17 JLM19 who cares there firiging plugs I dont use RN3c or 4s


#15

reynoldston

reynoldston

Now that we have the spark plugs all straighten out. I am still going to say if it starts with starting fluid he doesn't have a spark plug problem. I still want to know how do you tell what a weak spark is without a proper test???


#16

T

tybilly

reynoldston said:
Now that we have the spark plugs all straighten out. I am still going to say if it starts with starting fluid he doesn't have a spark plug problem. I still want to know how do you tell what a weak spark is without a proper test???
Click to expand...
reynoldston is right,but if you hold the plug wire with your hand crank the engine and if you don't poop your pants,its a weak spark.lol


#17

reynoldston

reynoldston

tybilly said:
reynoldston is right,but if you hold the plug wire with your hand crank the engine and if you don't poop your pants,its a weak spark.lol
Click to expand...


You gave me my morning chuckle :laughing:


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