AJS Stormer Frame

Information on the Stormer 2-stroke machines
fullchoke
Posts: 27
Joined: Tue Sep 07, 2021 5:32 pm
Location: Oregon

AJS Stormer Frame

Post by fullchoke »

I answered an ad for AJS parts yesterday hoping to find some Model 18 parts. The owner thought his parts were for a 4 stroke bike, but he had no engine, and didn't know what he had(no pictures available). I didn't know either when I had a look at them, but knew they weren't model 18, and thought they were 2 stroke. I bought everything, thinking this was a 2 stroke dirt bike at some point in the past, and I especially like vintage dirt bikes, plus everything was very cheap. The only AJS 2 stroke I know of was a Stormer so I googled it and that is what it is. The frame # begins with an A followed by a 3digit number. What I'd like to know is what year this frame is and what engine it originally had in it. I'm hoping the A might mean something to identify it. What I have is basically a rolling frame in pieces. The fiberglass gas tank says AJS, and looks yellow under the repaint. I appreciate your thoughts on this.

Thanks
fullchoke
Posts: 27
Joined: Tue Sep 07, 2021 5:32 pm
Location: Oregon

Re: AJS Stormer Frame

Post by fullchoke »

Since nobody has yet responded about the A in the frame #, I'm thinking that there may not be a way to tell what engine was originally in this frame. It appears that all the stormer frames, from what I have been able to digest from the web, had the same geometry no matter which of the 3 engine sizes were installed. The wheels have very old Dunlop Sports knobby tires, still on the Dunlop wheels, so it was an offroad bike. The engine mounting tabs have been removed from the frame, so it looks like someone planned on installing a different engine, but never did.

Thanks
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Rob Harknett
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Re: AJS Stormer Frame

Post by Rob Harknett »

Have you searched this forum?
Some came in kit form, the assembly owners manual may give some clues.
http://archives.jampot.dk/book/Owners_m ... Manual.pdf
http://archives.jampot.dk/editorial/Scr ... oad_Racer_(Motorcycle_Sport_Book_1968.pdf
http://archives.jampot.dk/editorial/Scr ... ormer_AJS_(Motorcycle_Sport_Quarterly_197.pdf
http://archives.jampot.dk/editorial/Scr ... _1970).pdf
fullchoke
Posts: 27
Joined: Tue Sep 07, 2021 5:32 pm
Location: Oregon

Re: AJS Stormer Frame

Post by fullchoke »

Thank you for the links, The middle 2 did not work for me.

One difference between a 250 and 370 is the spoke size. 250-10SWG, 370-9SWG. I will see if I can find out the difference between 9 & 10, then compare what is on the wheels.
It appears that mine had the Filtron air filter element. The remains of the element were in the air box, and had a little crumbly foam still on it, but no paper, making it the US model.

Thanks
fullchoke
Posts: 27
Joined: Tue Sep 07, 2021 5:32 pm
Location: Oregon

Re: AJS Stormer Frame

Post by fullchoke »

The spoke size is 9SWG, so that points that it was not a 250. Since I don't know what spoke was on a 410, I can't eliminate the 410 yet, but it is looking like a 370 may have been the original engine. There are probably other factors that would help, but I don't know them... still learning. Appreciate the help.
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Cjay59_LAPSED
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Re: AJS Stormer Frame

Post by Cjay59_LAPSED »

Hi again fullchoke, have a look at my website, https://ajsstormer.wordpress.com/ and https://ajsstormer.wordpress.com/2021/0 ... 0-stormer/
then join my Facebook page, https://www.facebook.com/groups/329027254430129 here you will find other US owners, riders and guys who worked for AJS in the US, and were US Team riders. and the competition team manager. Brian Slark.

The frames are much the same, as you say, but as the engines increased in power the frames were strengthened, AJS Motorcycles still exist and they have the frame number records, so you can email them and they may be able to identify the machine. https://www.ajsmotorcycles.co.uk/pre-74-stormer
Later frames are covered here, also with an interview with Freddie Mayes, https://ajsstormer.wordpress.com/2020/0 ... evil-2020/

Jampot AJS Stormer.jpg
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fullchoke
Posts: 27
Joined: Tue Sep 07, 2021 5:32 pm
Location: Oregon

Re: AJS Stormer Frame

Post by fullchoke »

You have a great site for the AJS Stormer.
Back in my youth I never seen, or heard of the AJS Stormer. I watched a few vintage races on You Tube recently, and saw my 1st Stormer there.
I sent in my frame numbers. If anything is found out on it, I'll post it here.
It was mentioned on your Stormer site that later development and updates for the 410 Stormer included 10 mounting bolts for the rear sprocket, an increase over the 5. I'm not sure if all 410 had this update, or if any 370's had this mod too. Mine has 5.
I bet it is very difficult to find any Stormer engine no matter the size.

Thanks
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Rob Harknett
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Re: AJS Stormer Frame

Post by Rob Harknett »

https://www.ajsmotorcycles.co.uk/pre-74-stormer
Have you looked on the AJS website. I think they still have some of their 70's bike's parts in stock.
They do of course have their factory records to date their bikes. You may see FB stormer referred to.
Thats the company owners initials Fluff Brown.
Ashampoo_Snap_26 September 2021_10h50m45s_001_.jpg
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Cjay59_LAPSED
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Re: AJS Stormer Frame

Post by Cjay59_LAPSED »

Hi fullchoke, this is the US Story I did last year, you may enjoy, and this 250cc engine is for sale in the US, ( I have a complete 250 motor that turns over with compression for sale, I have the tank, frame, wheels front and rear and forks in the U.S.) Lyle Johnson and Jeff Gaynor has one in Arizona 300 dollars with Carb. Both in the Facebook Group.
Engine.jpg
https://ajsstormer.wordpress.com/2021/0 ... 0-stormer/

Fluff Brown always said the 250cc was the best, less vibration, and it would avoid you needing a strengthened frame, sprocket etc, the engines will go in which ever frame you choose and unless your bike had competition history that would make it special, don't worry about it, build it as you like..
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fullchoke
Posts: 27
Joined: Tue Sep 07, 2021 5:32 pm
Location: Oregon

Re: AJS Stormer Frame

Post by fullchoke »

Rob, I tried that link but it won't work for me, so I sent a message. I don't know if the link was supposed to go to a special location. I'll post what info I get back.
CJAY59, I don't have anything engine related. A pipe may be hard to find too, or does anything aftermarket work? I have Wheels & hubs, (bad sprocket, so I will need that), frame with the engine mounts cut off, forks, gas tank, air box tin without lid/plate, and a stand. I'll see if I can get on facebook, but I had problems trying that before.

Thanks
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