[trusty220]

Your wallet??

[trusty220]

Download Shrinkpic and it will automatically downsize any photo’s that you want to include.

[trusty220]

It’s interesting to note that they appear to be using the JAP 2A on the lawnmower in the advert. If they made their own engine why would they be buying in another make?

[trusty220]

The one thing that is worth trying is to re-set the governor. Some people used to set it to increase the revs under load to offset the effect of blunt cutting cylinders, so you may have been the victim of this bad practice.

It is a simple setting to make but you need three hands. With the engine stopped, key out of ignition and handbrake applied, follow the governor rod down from the throttle butterfly to the governor arm. On this arm you will find a small clamping bolt which you must undo. Hold the throttle into the fully open position on the carb and note which way the governor arm turns to reach the fully open position. Insert a small, slotted screwdriver into the slot on the end of the governor shaft and turn the shaft in the same direction until you feel a stop, then tighten the clamping screw to fix the arm to the shaft in this full throttle position.

After this the governor should pull the engine down to tick over if the governor is working correctly.

Best of luck.

[trusty220]

I can see why you think that because it has a circular crankcase. I had an old JAP engine some years ago which came off a Ransomes mower of unknown vintage which was a similar shape, but it had J.A.P. cast into the crankcase just below the barrel..
Have you thought of asking the OLC for information?

[trusty220]

According to my Wipac manual the FW880 was only fitted to JAP 2A’s with clockwise rotation. I’m very confused now, because Charlie’s photo’s show an engine very similar to the 2A in layout, but it doesn’t look like the 2A that is fitted to my Trusty mower.

More digging required, methinks (and no pun intended!).

[trusty220]

The colour one is a Douglas engined Trusty. The JAP 5 and 6 didn’t have that type of tank support, they had a cast iron bracket with solid vertical supports. The Douglas SV54 had the tank supports made from mild steel strip which is what is shown on the colour picture.

[trusty220]

It’s good to see a rally organiser that has a creative streak. Lots of different sections imaginatively laid out so that it keeps the visitors’ interest going.

Long lines of tractors don’t look appealing to anybody, but when they are parked in circles under trees or in little groups spread about the field, or a Porsche car parked next to a Porsche tractor, it shows that more than a little thought has gone into the layout.

I’m kicking myself that I missed it! There’s always next year, though.

[trusty220]

We currently don’t have a Gunsmith Register. There is a helpline detailed in The Cultivator that Ivan Clark runs. Give him a call.

[trusty220]

I’m guessing there’ll be a few more yet as well. I feel sorry for the organisers.

[trusty220]

Is it a centrifugal clutch? The normal mistake is that people fit the shoes as leading shoes like in a drum brake because they grip better that way. Correct for a drum brake, but wrong for a clutch. The shoes need to be in a trailing position so that they disengage easily.

[trusty220]

The wheels and gearbox are from a Ransomes Reelcutter/ Multimower. They are virtually indestructible and are the only things left after everything else will have worn out!

[trusty220]

Try Meetens Industrial Engines. They are my first stop for most things.

[trusty220]

Definitely a Spintrim from Bob Andrews of Sunningdale.

[trusty220]

The only thing that I can think of is an incorrect setting somewhere- either tappet clearances are too great or the engine may be overspeeding. It certainly is not a common fault and I’ve run JAP engines on my Trusty tractors for years.

I wonder if the clue is in the description- it is only the exhaust valve that is doing it. Exhaust valves heat up considerably more than inlet valves because they are not being cooled by the incoming air, so many manufacturers tend to make the exhaust valve out of a harder material. You may be replacing the broken exhaust valve with an inlet valve (which is the same size and shape), so that may be worth checking out.

Similarly, the exhaust valve spring is normally made of thicker wire so that it conducts heat away from the valve stem more efficiently. If it can’t dissipate the heat then the valve stem may fail.

I hope that helps.

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