Young Lad Needing some help.Howard Gem. JAP 600SV

This topic has 8 replies, 3 voices, and was last updated 8 years, 7 months ago by vhgmcbuddy.

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July 27, 2017 at 10:49 pm #26057

vhgmcbuddy
Member

Hello, my first post! my name is Ben from South Yorkshire and im 20! (feels like a gameshow ha)

Recently into my possession fell a JAP 600 side valve from what I believe is a Howard Gem Rotavator.

My aim is to rebuild the engine and build it into a cool custom motorcycle, however.
It has attached to the LHS on the engine a big orange flywheel and the body it sits in, now to remove this i’m guessing a puller is involved as I can see two bolts holes front and center but my problem is I can find two bolts that screw into them my garage.

So my question is how do I remove this massive flywheel? a special tool? any help or advice is extremely appreciated.

July 28, 2017 at 8:16 am #26068

trusty220
Keymaster

A photograph would be a great help to identify the type of flywheel. I’m guessing it would be off a Howard Gem.

July 28, 2017 at 12:10 pm #26071
vhgmcbuddy
Member
Photos added i can see a fly wheel puller is needed but anyone know how big/ which one/type is needed. thank you.
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July 28, 2017 at 5:44 pm #26079

vhgmcbuddy
Member

Now you’ve removed the nut, I find the easiest way to remove the flywheel is to undo the 6 nuts holding the Orange airshroud in place on the opposite side of the engine and then give the shroud a couple of clonks with a soft hammer. Maybe not the correct way but very effective.

July 28, 2017 at 5:47 pm #26080

vhgmcbuddy
Member

Will give it a go now, thank you S1.

July 29, 2017 at 5:10 pm #26083

vhgmcbuddy
Member

No joy, tried that aswell as many others. its really on the crankshaft. can someone link me to the correct type puller please?

July 30, 2017 at 8:57 am #26087

vhgmcbuddy
Member

You’ll probably have to make one. What you need is a bit of thick flat plate( or angle will do) with 3 holes drilled in it. Weld a nut on the centre one so you can thread a bolt in to push on the end of the crank, the get 2 bolts the same thread as is tapped in the flywheel, I can’t find my book at the moment so can’t find what the thread is but do you know anyone with a set of thread gauges?
When the tension is on you may have to whack the centre bolt to shock the flywheel off the taper.

July 30, 2017 at 9:00 am #26088
vhgmcbuddy
Member
They will come off if you keep at it.
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August 3, 2017 at 12:27 pm #26145

vhgmcbuddy
Member

Quick update for anyone checking this out in the future, got it off finally with thanks to £14 harmonic puller from ebay, works perfectly. all the best.
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