2stroke4stroke

A MAR with brakes? Somewhat of a novel concept that. I seem to recall the main purpose of the linings on the Ossa was to remove rust on the surface of the drum ☺

If it has been left with petrol in the carb then it will probably need a strip to clean out the gunge before it will start. If carb is clean it should start fine with fresh twostroke mix.

It has not been uncommon over the years for manufacturers to put someone out on a specific machine different to the rider's norm where there is a capacity award. The pot is there to be won so they go for it.

If you frame had moved I suspect you would see the cracks as I don't think it would bend much, unlike a steel one.

Thanks Mark. I'm fairly sure the dealer's bicycle trackpump did not dispense nitrogen ☺

Best I can do is to say early Seventies. I think, but may be wrong, that all 348 years had them but 349 did not. Montesa experts will correct any error.

Why do we have fatbars? My 348 had the bigger diameter bars, presumably for strength, but they were not (unlike fatbars) very resistant to bending so there was a market for shims to convert to accept 7/8 Renthals.

I've dragged the old units out the spares box and wonder if anyone can recall what pressure they should be pumped to. I did read somewhere that 200 psi was the figure but that seems more like that for air spring units and i certainly don't think my local Fox dealer had the equipment to pump or measure to that sort of pressure when he set them. I may have had a manual but that will be long gone. Any advice appreciated.

Could be a non-standard coil, that metal plug cap is definitely not original. Gearchange mechanism can be fragile - I'd raise the gear lever to avoid hitting rocks. Posssibly Marzocchi rear suspension? Bits for rebuild should be obtainable even though they stopped making motorcycle stuff a couple of years ago. It won't run at its best with the altered air filtration arrangement, this might be part of your problem.

Looks like the guy in blue might have the front view, if he clicked in time. Even allowing for the greater preponderance of cameras compared to 1961 it's still quite amazing that the fraction of a second was captured.

I recently had a shot on a very good original example of a 349 and it was flat as a flounder so I suspect yours may be as good as it is going to be. I certainly don't recall my 348 being as soft (but memory may have diminished over forty years) and some of the works boys didn't rate the 349 compared to the 348. But you seem to have what is basically a sound bike so good luck in finding an event to use it in.

I was curious how much weight my enduro bike was accumulating all those years ago so I swept up the mud after hosing, let it dry then weighed it. 15 pounds. OK, it would be more wet and a trials bike does not collect as much but a fair weight nonetheless - certainly in the context of what some folk will pay to save a fraction on, for instance, footrests.

He does appear to have a travelling attendant to park his bike for him at the section and ride it out after the five if Trotter's is indicative. Must be a bit puggl't.

A win at Kinlochleven would appear to indicate a restoration of mojo on Gary's part?

Regardless of warranty or not there has to be grounds for the dealer to sort things if a brand new motor vehicle has a clutch that does not work properly.

Just remove the exhaust pipe for a quick look in the port - this may guide you as to the necessity for a full strip.

I know guys in the IT business who have used computer cooling fan motors as (cheap) replacements in vehicle applications.

I got bar risers giving several options on height - the kit included all longer bolts needed to use any of the options quite safely. Comes up on a search. I think the bars would rotate before the bolt holes were over stressed, though I concede there is a bit less meat there than on some bikes.

You don't really get the choice. What we might call trials chain comes packaged in a standard length which is longer than needed for most bikes. It is then shortened to suit. Off the top of my head I can't say what the 4RT length is but you can work it out from what was on it by counting the teeth and adding or subtracting as necessary based on the length of the old chain (I'm assuming non standard gearing from your question). As you don't have a local trials dealer up there you will likely be going mail order - a good dealer will chop the length for you but far better to get a chain tool as well and do it yourself to suit the bike. There is good scope for chain adjustment on the 4RT due to the two threaded holes for the stops. I run mine on the one that keeps the wheelbase as short as possible, which may differ from as they come.

I must have missed a page somewhere along the line.

Conrod lift would indicate big end play. To check mains you need to try to lift the end of the crankshaft ie try to move the flywheel up and down.

Any update then Chappo?

You could hold the flywheel with a strap wrench to tighten it.

Even better - cut some plastic tubing to form rings.

Don't think I'll be sharing the trench digging, thanks.