Quad Polsten spark plug?
 

As the title says, it's off my Quad polsten, but its knackard, does anyone know if there's a modern equivilent?

The only markings are 6-M and its a Champion.

http://img132.imageshack.us/img132/3306/qcv4.th.jpg

Thanks.

Tyler.

Tyler

This company probably have the largest range of old spark plugs in the UK.

www.gsparkplug.com/

Thanks for that I'll take a look.

Tyler.

Briggs....
 

You may have some luck in the small horsepower engines or small engine repair establishments..Looks like a spark plug for a lawn mower..
Probably would work if you could find the heaT range..

Re: Briggs....
 

Tyler ..
Here are some alternatives..
From the Cushman manual....

What Spark Plug should I use? Most references state that a Champion #7 spark plug was used for 1948 and earlier scooters. However, the Cushman manual for the model 32 and 34 published in 1943 states that the correct plug is a Champion 6M. A suitable substitute for either is the Champion D-16 and this is also the correct plug for all later engines that do not have a tapered seat. Heads with tapered seats used a Champion F14Y, which is no longer made but some Cushman dealers may still have a few in stock. A Champion RF14Y or RF14YC is an acceptable substitute and is readily available, but it is a resistor plug. Other plugs often recommended for the tapered seat head are the Bosch 6200, Champion 4011, NGK WR5, Champion 870 and Autolite 46. You should make your own determination as to the suitability of any of these alternate plugs. Be sure not to put a tapered seat plug in your non-tapered seat head or it will likely be ruined. I gap all plugs at .026. Cushman gave various recommendations for gaps over the years, .027 to .030 for the 6M, .030 to .033 for the #7, and .026 for the F14Y. If you have excessive fouling problems you can go to a higher heat range plug. A higher number plug is hotter and a lower number is colder. Many of the hopped up engines work best with a colder plug.

Re: Quad Polsten spark plug?
 

You'd probably need to look at one in the motor factors but translating your picture to the NGK codes:
http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm
you have a 14mm thread of about 10mm length, taper seat and short insulator. This would equate to a BM6F I think.

Having spoken to a NGK rep recently, he advised that the huge range of older plugs are now replaced with one equivalent because of material advances. Just about everything has a heat rating of 6 and the other differences are mechanical.

R.

Re: Re: Quad Polsten spark plug?
 

The Champion 6-M was a US made plug, I looked it up in a very old KLG book and it equates to a KLG M30. This plug is an 18mm thread with a reach of 12.5mm, not taper seated either, just conventional washer type.

Tyler, go to www.gsparkplug.com and with info I posted to your request on HMVF forum, you will see that the British Champion equivalent from my 1951 KLG book was 17. The Green Spark Plug Co. website shows 17 to be now superceded to D9 which has a copper core, available of the shelf at a few pounds.

Richard

Re: Re: Re: Quad Polsten spark plug?
 

The problem of not having a scale to the picture!

That's a NGK AB2, somewhat odd in having a smaller hex than usual and being a very soft plug. Available from the net, eg:
http://www.camskill.co.uk/products.p...8b16s1221p4345


R.