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Old 06-12-17, 07:22 PM   #11
1956ld1
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On my Jap 6, the engine wont start if the mag (wico a) is 180 out so could be that still...
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Old 06-12-17, 07:32 PM   #12
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Quote:
Originally Posted by martinpaff View Post
'Fraid not - go and watch an engine; exhaust immediately before inlet.

MP
Thats what I was missing. Lol
So turned the other way would correct it then ?

Neil.
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Old 06-12-17, 08:48 PM   #13
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I've owned several JAP model 5's and 6's over the years and every one has had the exhaust on the right hand side. I've never seen a reverse rotation JAP 5. Could You post a few more pictures of the engine, such as the air cowling and the flywheel please to clear up this argument or we'll be here for ever!!

First stupid question on the thread, are You sure it's a JAP Model 5? (Petter A has the inlet on the right)
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Last edited by pulsechoes; 06-12-17 at 08:58 PM.
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Old 06-12-17, 09:28 PM   #14
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The only reverse rotation models mentioned in the JAP manual are the 2A and 2S models. As Charles said the exhaust is on the right. I suppose the mag impulse should click around the TDC mark.

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Old 06-12-17, 09:32 PM   #15
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Gents,
Thanks for the advice, the exhaust valve is nearest to you in the video and the engine turns clockwise when looking at it from the front. There is no serial number to help in identifying the engine.
I think I have been getting myself in a muddle because it fires every rotation. When you focus on the alternative spark everything is wrong, watch the correct one and it all falls into place. The problem is that it fires AFTER TDC and not before.
I have taken the govenor cover off and there is a letter E on the cog that eventually goes to the coupling which connects to the mag. I have marked it (not very well) with chalk on the pic. I cannot see a corresponding mark on the engine cog.
When the E meshes with the engine cog the impulse clicks but the piston is on the way down. I did not get chance to get the mag off tonight but I am wondering if the shaft will push forward to let me adjust where the cogs mesh.

I did try the mag 180 degrees round and the impulse kicked in at the bottom of the stroke.

I am sure it is a JAP 5 because the cowl has JAP on it and there is JAP cast into the block. There are 6 bolts on the head which the 5 has against the 6 which has 8
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File Type: jpg DSC_0018.jpg (98.0 KB, 24 views)
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Old 06-12-17, 09:46 PM   #16
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This may seem like a silly question... but have you been trying hard enough to start it? My jap is a ******* to start since of the updraft carb system, see if it will fire with a squirt of petrol of wd40...
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Old 06-12-17, 09:58 PM   #17
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Quote:
Originally Posted by Hornet 6 View Post
What am i missing here Rob, i'd have said its correct if the closer valve was the inlet.
Suck, squeeze, bang, exhaust and repeat.

Neil.
Stick to 2 strokes if I was you Neil....
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Old 06-12-17, 10:18 PM   #18
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Quote:
Originally Posted by Appletop View Post
Stick to 2 strokes if I was you Neil....
Or 4 strokes with the valve sizes round the right way ?

Neil.
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Old 06-12-17, 11:10 PM   #19
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The spark should be past tdc until the engine gets up to speed and the impulse disengages. To me all is as it should be. Might need to look into other things like the spark plug.
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Old 06-12-17, 11:51 PM   #20
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You will find a serial number stamped on the machined top face of the crankcase where the cylinder barrel bolts on. Attached find a picture of the number of my Model 6. Your number will start with 5. The "R" denotes the year 1955.
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Last edited by pulsechoes; 06-12-17 at 11:57 PM.
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