Our follow up project to the successful .56 is the .37 (almost .40 performance from a small .25 sized case). Yes, I know its been done before!.. But we were keen to see how much power was available from a .25 case, before you needed to change the case size (and therefore weight ) to a .40 (or mid .38 ~ .40 sized case)

Our answer was the J'EN .37....

"It starts easily, goes well, has great transition and it’s very smooth. It’s a quart of power in a pint pot and if it came in a tin then I am sure Just Engines would say “it does exactly what it says on the can!"
Steve Dorling (AMI July 2005) - Read the Full Review here.



This Engine now Discounted By 10%! Was £53.10 Now £47.79 (Including VAT at 20%)
Discount will be applied in Shopping Cart, limited stock avaliable.

People who bought this item also bought:

1. J'EN '4' Two Stroke Plug

2. APC 10x6

3. APC 10x4

As we've been asked for a .40 size engine for trainers and sport models that do not need the awesome grunt of the .57, here it is, a 40 sized with almost 50 sized performance!

(Camera flash has made it a bit blue! - see other J'EN pictures for correct colouring)

Customer Comments;
* I recently purchased a .47 from you and am just emailing to say how impressed I am at the quality and performance - much better than another manufacturer's .46 it replaced!!. D. Everest

* Paul, I just thought I'd email to say this JEN47 is a work of art - your photos do not do the quality and colour any justice - seems a shame to actually mount it up and run it!! S. Kidd


This Engine now Discounted By 10%! Was £57.18 Now £51.46 (Including VAT at 20%)
Discount will be applied in Shopping Cart, limited stock avaliable.

People who bought this item also bought:

1. J'EN '4' Two Stroke Plug

2. 2 Blade Aluminium Spinner

3. J'EN Spinner Nut 32mm

We’ve been working for more than 2 years on this project - to see how far you can bore and stroke a .40 case before it either doesn’t work, or becomes too fragile. We tried every piston and liner combination from .52 to .57 and after success with the .56 we have now arrived at a very nice .57!

(Camera flash has made it a bit blue! - see other J'EN pictures for correct colouring)

"The JEN56 is indeed a .40 size package that thinks it's a 60."
Malc Pinnock, (RCM&E September 2004) - Read the Full Review here



This Engine now Discounted By 10%! Was £64.33 Now £57.90 (Including VAT at 20%)
Discount will be applied in Shopping Cart, limited stock avaliable.

People who bought this item also bought:

1. J'EN '4' Two Stroke Plug

2. Std Fuel Tube (3/32)

3. APC 12x6

The .60 that knows it's a .90!

This is the Jen .91 MK 2, now with retimed liner, baffled silencer and improved compression ratio.

• Stunning purple and black
• Wide range of silencers and Pipes available as O.S. compatible exhaust port used.
• Retimed liner for more power
• Baffled silencer as standard
• Improved compression ratio for smoother running

"This engine is happy whether revving hard or lugging a big propeller on the knee of its torque curve and when you add into the mix its excellent throttling and starting behaviour, there really isn’t anything lacking."
Steve Dorling (AMI magazine) - Read the Full Review here



This Engine now Discounted By 10%! Was £81.47 Now £73.32 (Including VAT at 20%)
Discount will be applied in Shopping Cart, limited stock avaliable.

People who bought this item also bought:

1. OS No 8 Two Stroke Plug

2. Std Fuel Tube (3/32)

3. J'EN '4' Two Stroke Plug