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Custom Piston Rings - RJM Machine Worx

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Custom Piston Rings - RJM Machine Worx

Old 03-28-2020, 08:42 AM
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Talking Custom Piston Rings - RJM Machine Worx

Years ago, Frank Bowman was the provider of a wide variety of piston rings for our engines.
In 2017 he sold his business to Bjorn Baal.
For a while, Bjorn did business by email only. I reached out to him just yesterday and he passed a link to his new website which is a huge improvement to his accessibility!


I'm rebuilding a Super Tigre 90 and Bjorn's response to questions was nearly instantaneous - literally within just a couple of hours!

I've used his rings in ths past with success, and I'm confident that my newly ordered Super Tigre rings will work great.

Old 03-28-2020, 04:37 PM
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I bet they will work great.
Old 04-21-2020, 06:46 AM
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They do work great! Just got a ring for my Fox 50. It's perfect. Took about ten days, they said there was one week lead time. Well worth waiting for. It's awesome to have someone still provide a service like this for our hobby.
Old 09-29-2020, 05:59 AM
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Default new ring for supertiger .75

Just received my new ring for a Supertiger. This was fast, less than a week. fit perfect.
Old 09-29-2020, 04:55 PM
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Bjorn just sent me a YS-120 ring. It arrived in 3 days and also was a perfect fit.
Old 10-07-2020, 02:31 AM
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Making piston rings takes skill. Making fine piston rings is an art form.

I have not used any of Bjorn’s rings yet, but I will be. I have an ST G60 Blue Head and about HP .40 that need rings. I’ll be using Bjorn without hesitation. OEM rings work fine, but they often take longer to break in. I like the quicker break-in of Frank/Bjorn’s Meehanite and the narrower ring gap makes for a better seal.

I still have about a dozen of Frank’s rings hanging on my parts wall. I am a hoarder - I ordered spare rings for every ringed engine I owned (at the time) awhile back. . I’ve only needed to use a few of them so far.

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