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JC Twin Identification

Old 06-25-2024, 04:04 AM
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Default JC Twin Identification

Hi ALl

I've recently picked up a second hand 100cc Edge. It has 8 Hitec HS7954SH servos and a Powerbox system. It has never flown before as the wings still require finishing.
It also has a twin JC engine with a twin can exhaust system. Is there any way to identify what engine it is?
The owner couldn't remember what cc it was. I am very interested to know.

Many thanks
Bluetomcat74
Old 06-25-2024, 02:48 PM
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Does it look like this?

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JC120 EVO Gas engine w/CD-Ignition 120cc/12.5hp @ 8,000rpm

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ID:	2274369The JC120 twin cylinder gas engine is a powerful, nicely made excellent quality piece of kit.It is supplied with a whole host of accessories including an electronic ignition system, mufflers, mounting template and a warranty card.

Features:
• Lightweight but strongly made
• Compact design
• High quality machining
• Powerful, 12.5HP @ 8,000RPM
• DC-CDI electronic ignition with computer controlled auto advance
• Walbro carburetor with diaphragm and manual choke

Specs:
Engine Type: Twin cylinder 2 stroke air cooled
Displacement: 120cc
Bore/Stroke: 45x38mm (each cylinder)
Max Power: 12.5HP @ 8,000RPM
RPM: 1,100~8,000RPM
Ignition: DC-CDI electronic ignition with computer controlled auto advance (4.8~6V)
Spark Plugs: CM6 x 2
Carburetor: Walbro with diaphragm and manual choke
Fuel: Gas/oil mix (25:1 for break in, 40:1 for general use)
Weight: 3000g including ignition and mufflers

Dimensions:
Length from Mount to Propeller Boss: 165mm
Height from Crankshaft Center line to Top of Carb: 120mm
Width (Spark Plug to Spark Plug): 281mm
Mounting Holes: 70x80mm
Old 06-26-2024, 01:10 PM
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No unfortunately it doesn't. I think its the older one. Ill try and take some pictures over the weekend. It has a large black air intake/filter over the underside of the carb.
I think it maybe an original or one of the first MK's to be produced.
It is more square/boxier than the curved cylinder head cooling fins in the pictures.
Old 06-27-2024, 05:37 AM
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Bore/Stroke: 45x38mm (each cylinder)

With the plug removed you should be able to measure the stroke.

Old 07-05-2024, 01:53 PM
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Originally Posted by kmeyers
Bore/Stroke: 45x38mm (each cylinder)

With the plug removed you should be able to measure the stroke.
how do I measure the stroke? I don't have any specialised equipment.
Old 07-08-2024, 07:07 AM
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1. remove the spark plugs (so the engine turns freely)
2. insert a dowel (or something) into the cylinder until it touches the top of the piston
3. rotate the engine and mark on the stick the highest and lowest
4. measure the distance between the two marks
easy peasy
that is the stroke
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Old 07-08-2024, 12:23 PM
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Awesome. Thank you very much. I will try that tomorrow and let you know how I get on.
I have photos to put on here too but can't upload them.
Old 07-09-2024, 10:50 AM
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Originally Posted by bluetomcat74
Awesome. Thank you very much. I will try that tomorrow and let you know how I get on.
I have photos to put on here too but can't upload them.
Are you a robot or a troll?
I think the rules require a certain number of posts, like ten. So, do a quick yes and ok to boost your count.
then go advanced and try a pic.
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Old 07-09-2024, 11:40 AM
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Originally Posted by kmeyers
Are you a robot or a troll?
I think the rules require a certain number of posts, like ten. So, do a quick yes and ok to boost your count.
then go advanced and try a pic.
I am not a robot
Old 07-09-2024, 02:58 PM
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You are still one post short of pic ability.
Another way is the old bump (which is a blank post).
You have to reach ten.
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Old 07-10-2024, 02:15 AM
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Originally Posted by kmeyers
You are still one post short of pic ability.
Another way is the old bump (which is a blank post).
You have to reach ten.
haha no worries ill keep going!!!
Old 07-10-2024, 02:16 AM
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Let's see if I can post some Pics then....

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