Onan Spark Plugs

[WHX?? 48,815]

Hey guys, What would be the correct spark plug for the P220G. There are Auto lite 437's in it now but the manual says a 167-0272 which is supposed  to be a Champion  RS17YX. The RS17 is a tapered seat plug with a .708 reach. The Autolites are a ring seal with a short reach. 

One of the plugs blew right out and it looks like the heads take a ring seat plug but looks like it would  need a long reach plug.

This motor is not in a WH but a Snapper 1255  I inherited from Dad.

[boomers_influence 106]

whx6

the early P small blocks used,

RS 14 YC champion. ( reg tip )

later RS 17 YX  (platinum tip )

they are the taper seat, long reach.

thank you. boomer ( the used onan engine parts guy, also NOS and new )

[WHX?? 48,815]

Thanks Boomer, I did find a manual that identifies it as a B48M. It says to use a Champion RH8 plug. How would one know if this is an early motor? 

Another parts site says the B48M uses Onan PN 167-0298 short reach plug.

I am sure my 520H P220 uses the RS14YC which is what my Briggs 18 Hp twin uses.

[Martin 2,132]

On November 24, 2015 at 7:23 AM, WHX6 said:

Thanks Boomer, I did find a manual that identifies it as a B48M. It says to use a Champion RH8 plug. How would one know if this is an early motor? 

Another parts site says the B48M uses Onan PN 167-0298 short reach plug.

I am sure my 520H P220 uses the RS14YC which is what my Briggs 18 Hp twin uses.

 

Your engine is a P220 and not a B48M. Both are different engines. The P220 as Boomer states above used a taper seat, long reach plug, either a RS14YC or RS17YX. The early/late engine cut off could be determined by the spec number above. P220G-I is your engine model number, 10940D is the spec number with the last letter being the key here. Im not 100% on what letter designated the change over from one plug to the other, but the D spec is an early engine compared to the G. I have 2  WH 416s, a hydro and an 8 speed.

 

Here is the decal from my 1995 416H. Spec on this engine is 10976D.

 

 

My 8 speed is once again a 1995 but made later than the 416H, the WH serials are only 200 or so apart. This is a reproduction spec decal from that 1995 416 -8. All the numbers are exactly how the original decal was. The spec on this one is 10976G. So it looks like WH changed from D to G spec engines in 1995. Note the D spec decal has a similar look to yours (without the Toro Power Plus header) and the lower one had a newer look.

 

Edited January 31, 2016 by Martin

[JackC 617]

Reproduction ONAN spec decal? Where can we get those? Vinylguy?

[Martin 2,132]

yep......