Terrot MT 1, 100cc 2 stroke: non-starter!

[mini-me]

I wonder just what else can get in my way?

A reality check?

Bankruptcy?

the end of the world?

the second coming?

[Rex]

Perhaps the piston is correct for a Terrot but just not for your particular model? Older or newer, maybe?
Think you may have to wait for Jean-Claude to acknowledge that it's no good for your bike though.  That vin rouge won't drink itself...

[mini-me]

Have you tried moving the barrel  round a little to the left perhaps?

[Terrotmt1]

You have been sampling the bottle of red!

I've resigned to adding 2 new pins else where round the the ring groves well away from any port, i.e. 180 deg on the other side of where they are now!
I think also the piston is for a Terrot MT1, just not mine!

Long holiday coming up so might leave the re-pin for a few weeks.

[murdo]

You have more patience than me. I would've had it on evilbay a long time ago.
Good luck with it and I do hope there is noise at the end.

[cardan]

Anyway, there is a huge 40mm wide land in the bore 180 deg opposite the current location. why the designer did not put the pins there I'll never know.

The steep side of the piston crown points towards the transfer port - the one that carries the charge from the crankcase to the cylinder. Correct?

Leon

[Terrotmt1]

Indeed it does.
The piston crown is huge, a blade almost that is mirrored in the cylinder head casting.
At tdc the combustion chamber is on the exhaust side.

I am not known for patience, but I cannot let this go until working properly.
I am known for being tenacious...

[cardan]

OK - I don't get it. In the photo of the bike (and the photos of the internals of the cylinder, piston and motor) it looks like the transfer port is at the back and in the inlet port (the lowest port, that is uncovered and joins the carb to the crank case at the top of the stroke) is on the left (near) side of the bike. Viewed from this side, the steep part of the piston crown is to the rear, so the piston ring gap was always in line with the inlet port? Or is it an optical illusion? Or maybe the rings stay above the inlet port, in which case which port does the ring join line up with?

Maybe the piston in the bike when you got it was incorrect. When you peg the rings so the joins don't align with a port, make sure you fill the original peg holes. Or just use the dremel to remove the half of the original peg projecting into the ring groove.

[Edit: I just can't imagine you'd have to slide the ring gap across a port to assemble the motor!]

Cheers

Leon

[Terrotmt1]

The original piston had no probs in the bore.
The ring gaps and pins all passed between to the one some of that unusually shaped port on clean metal along the bore.
The new piston, the second ring gap just about clears the edge of the same port, but the top ring gaps slide right into the port edge and the piston will not pass that port, it is a sold metallic stop.

Hope that makes sense.

[mini-me]

Nothing in this saga makes sense.
A sane man would have junked it long ago.


Tout de même, tout le monde a son propre poison.

[TGR90B]

Well without wishing to appear rude, I think it's becoming a thoroughly pointless thread an is only feeding your own desire to keep on posting. It's run it's course now; after all this time with nothing positive.
Purely my personal view.

[Terrotmt1]

Yes, I think you and others are of the same mind.
I approached this forum for help, and I've had a lot, and I'm thankful for that.

I'll sort it and move on.

[mini-me]

My dog is constantly humping a cushion, but after a while end he gets fed up and tries a table leg.

There's a moral there somewhere.

[Rex]

Yes, I think you and others are of the same mind.
I approached this forum for help, and I've had a lot, and I'm thankful for that.

I'll sort it and move on.

You hang in there and keep us abreast of how it's going.
You know the old Blues number which goes "if it wasn't for bad luck I'd have no luck at all"? Well, if it wasn't for your posts this forum would have no posts either! We need you....

[The Artful Bodger]

I agree with Rex, kind of look forward to your saga! If the rest of the piston is right, ie. gudgeon pin size, correct shape to the wedge on top then it's easy. Just file the brass peg down and re-locate it, careful work with a hacksaw will cut it clean with the ring groove and making a new pin is easy as you have a lathe. Won't come out as the ring will hold it in and don't cost nothing!
 9 thou ring gap is a bit excessive? However it won't stop it running, don't stop now. Can't say I'm holding my breath but do look regularly to see your latest update.
  Colin