classic motorcycle forum

Single sleeve valve radial engines were a doddle, if an artwork,

"I think the timing is out one tooth ..."

http://www.williammaloney.com/Aviation/RCAFRoyalCanadianAirForceMuseum/AircraftEngines/images/11BristolHercules734.jpg

I've heard that but it isn't true.

It was true at some point ?. My father accepted a late 1950s Benly as payment for something, and a big end bearing had gone.
Honda advised they were having some made, but the time frame was long and vague. And expensive ?
Other means were found to repair it.

I'd be surprised if those cush rubbers weren't in stock someplace in the world.
I ran into someone who had a stock of 40,000 sets of piston rings for something not common,
and he figured he had 10,000 years supply at current demand ...

Do you have a parts book or microfiche that covers your model,
and/or do you know the correct part numbers for these ?
Essential for chasing up obscure stuff that no-one knows by sight.
A pic of what the old ones look like may be helpful too, if they are still recognisable.
Or a pic of the housing where they came from.

You tried the main Honda importer where you are ?
Honda used to have a policy that no older part would go unsupplied,
and has a central warehouse someplace that must stock a lot of stuff !
They airfreight as/where required around the globe, and this (apparently)
costs (much)  less than stocking stuff all over the place.

Its extremely unlikely car parts could be substituted, there must be squillions of varieties of rubber bits,
but an eagle eyed parts salesman may be able to advise. They are a vanishing breed these days though,
its all new hires and a computer that knows everything - but refuses to give away secrets !

Sometimes the wreckers are a useful source of such stuff, although finding a low mileage back wheel etc
for the right year/model may be wishful thinking ? But you can ask...

I'm sorry, I don't know where I got that from !
I saved a pic from somewhere, so there must be another similar enquiry someplace in a parallel universe ??

Cutting your plunger rod as mentioned would seem to be an option, if it can't be shifted.

Something else to look out for, although maybe not related here, is that the fuel cap
has a tiny little hole in it to prevent a vacuum forming in the tank as the fuel is used up.
If this hole is blocked, the fuel supply can starve after a while.

Although it sounds like your problem is heat, like you say.
We see you investigating the spark timing on another thread here,
good idea, running retarded timing can make things extra hot....

I have seen that engine photo in internet, and think its in museum in UK.

Indeed, it was just a random pic off the internet, for an example.

I've heard the one locally here was sold off a while back,
and there were no large spares. I'll see if can find where it went.

There must have been a spares list of some sort, alough it might be tough to track down if there were few engines sold.
Being illustrated is probably being hopeful !
Tried the VMCC ?

Looks big for a 250 ?