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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



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

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 .



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

This baby has started everything we have thrown at to date including a Fuji 50cc ; Moki 2.10; Zenoah 45cc and 1.80 Four Stroke! It weighs only 1080g and is 170mm long and 46mm in diameter. Easily the best value geared starter on the market today. Geared 1:4.

Due to customer demand we have added an alternative, large, starter cone and rubber insert to our range, for our geared starter. This is for purchase as an optional extra if you have larger engines fitted with spinners and/or engines fitted with large spinners. This is simple to fit and can be interchanged with the smaller cone as supplied with the starter.

People who bought this item also bought:

1. Rubber insert for larger starter cone

2. Large Starter Cone

3. Starter Battery Clip

A 60 sized Purple Pipe, Purple Manifold of your choice & Accessory pack (silicon joining tube, silicon clamps & tube mount) all for a great price of only £60!



People who bought this item also bought:

1. J'EN '4' Two Stroke Plug

2. APC 12x10

3. Exhaust Deflector Medium

Supplied complete with:

• Full instructions (including twin cylinder wiring)
• Universal Radio Leads (JR, Futaba etc...)
• L.E.D. (so you can see when unit is operating)
• 1.2V rechargeable NIMH battery with tags

* On board glow for twins, with battery, is now supplied with 2 additional NIMH batteries and a lead. The three batteries are used so that the third cell acts as a buffer ensuring that if one plug goes out the other does not. It ensures a constant voltage to both plugs and is a safety net for the chip, ensuring that the electronics on the board keep one plug alight if the other fails.

Customer Feedback;
I have 4 of these now and they're just brilliant - no trouble at all - the best thing since sliced bread!! - please send me 3 more. Thanks. P. Savage

People who bought this item also bought:

1. 3/32 line clips

2. OS F Four Stroke Plug

3. Std Fuel Tube (3/32)

Silicon Joining Tube, Clamps & Mount for up to 60 / 90 pipe systems.

People who bought this item also bought:

1. Shut off Clamps

2. Pipe Mount

3. J'EN .57 Spare parts

This is a very straight forward smoke system that is powered by a Perry pump.

No need for batteries and therefore no need for wiring and charging. This system uses ordinary diesel and comes complete with everything you need except a small tank.

Click on picture to see larger image.

System includes; Perry pump; On Off Switch (you do need a spare servo for this); One Way Valve; Short length of Diesel Tubing; Diesel Conversion Bung for a tank and Smoke injector for the Exhaust (last two items are not shown in the picture).

People who bought this item also bought:

1. Onboard Mini tachometer

2. JEN .57

This is a very straight forward smoke system that is powered by a Perry pump.

No need for batteries and therefore no need for wiring and charging.

Click on picture to see larger image.

This system uses ordinary diesel and comes complete with everything you need except a small tank.

System includes; Perry pump; On Off Switch (you do need a spare servo for this); One Way Valve; Short length of Diesel Tubing; Diesel Conversion Bung for a tank and Smoke injector for the Exhaust (last two items are not shown in the picture).

People who bought this item also bought:

1. Blue Exhaust Silicone 12mm bore

2. A.S.P. 120 FS Spares

3. A.S.P. 70/80 FS Spares

New! Single ignition system for glow plug thread with spark plug cap at 120 degrees.



Ideal for four strokes with more recessed plugs. Supplied with sensor holder, hall effect sensor and cable tidy for the wiring.

Battery, spark plug and magnet not included.



People who bought this item also bought:

1. Glow Plug Thread Spark Plug

2. 4mm Magnet

3. Sensor Test Kit