Angelo Posted January 17, 2023 Share Posted January 17, 2023 (edited) My 1952 L85 750gpm pumper has champion d21 plugs in it. Not sure if that’s correct and can’t seem to find that info. Anyone have a clue what the 707b was supposed to have in it or what do you run? Thanks Edited January 17, 2023 by Angelo Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/ Share on other sites More sharing options...
mowerman Posted January 18, 2023 Share Posted January 18, 2023 I don’t have a clue, but if I were you, I would try Napa. They were the only auto parts store left that has a little bit of a knowledge, and most of their counter help have been around a while good luck … Bob Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-522786 Share on other sites More sharing options...
D-Day Posted January 18, 2023 Share Posted January 18, 2023 For the last few years champion plugs have been not so good so I have been using auto lite Ngk and even bosch 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-522788 Share on other sites More sharing options...
Angelo Posted January 18, 2023 Author Share Posted January 18, 2023 What motor do you have d-day Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-522982 Share on other sites More sharing options...
D-Day Posted January 18, 2023 Share Posted January 18, 2023 I don't have a gas engine like you, just spent a lot of time working as a mechanic for different logging companies and that leads to working on equipment of all kinds I have always had trouble with champion spark plugs I would change them out for autolite or another good brand and an engine would run better and start easier but it's getting harder to find the big old spark plugs in a heat range that works best in your engine the smaller engines seem to like NGK better Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-522996 Share on other sites More sharing options...
BOBWhite Posted January 18, 2023 Share Posted January 18, 2023 Adapter kits can be found to adapt the old pipe thread plug holes to new smaller plug designs but those never looked right to me. If you can find some two piece plugs that aren't in that bad of shape those are what I'd go for. Ebay's got some just don't pay exorbitant prices for em. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-522999 Share on other sites More sharing options...
mowerman Posted January 19, 2023 Share Posted January 19, 2023 I was just sitting here thinking if not for working with a lot of old Briggs & Stratton engines it would’ve been 23 years since I’ve adjusted a set of points instead, I just worked with them last summer on a minibike.., amazing how time flies kind of scary… Bob Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-523058 Share on other sites More sharing options...
mowerman Posted January 19, 2023 Share Posted January 19, 2023 Not sure what happened with champion they were a big name when I was a young guy as well as AC … Bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71718-1952-707b-spark-plugs/#findComment-523059 Share on other sites More sharing options...
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