250C2

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250C2

Postby Ming » 21 Sep 2016 17:31

250-2.jpg
250-2.jpg (229.26 KiB) Viewed 8337 times

250-1.jpg
250-1.jpg (106.16 KiB) Viewed 8337 times

Well - look what just turned up!
Looks pretty complete with new tyres too, missing the key to the fuel tank though.
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Re: 250C2

Postby 72degrees » 21 Sep 2016 18:03

I've never seen a 250 with a 2:1 exhaust before (well still with a 250 engine). Home brew? Nice to see it has adjustable bars - though the position is a bit odd to my eye. Are they OEM ?
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Re: 250C2

Postby Ming » 22 Sep 2016 06:47

If it's a 'home-brew' the exhaust system looks pretty good. I think the bars are original - though in an upright position. The foot controls appear to have been cut in half and re-welded to be shorter ( :? ), the plastic instrument console has split (don't they all) and the fuel tank appears to leak along one seam :( , which is OK as I can't remove the cap to put more in (yet)!
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Re: 250C2

Postby Ming » 24 Sep 2016 07:09

1st job - change the cam belt. 1st problem - the flywheel nut had been tightened with a hammer and chisel, but with a bit of filing I got a socket on and it wasn't very tight.
2nd problem - one of the hammer blows had deformed the lip of the flywheel so I couldn't get the puller in, luckily the flywheel came off with a few taps from a rubber mallet, then some judicious scraping and use of needle files allowed the puller to screw in (for the next time).
3rd problem - the woodruff key had sheared! I now need to source one, but not entirely sure what height I need?

Cambelt changed OK - on to the next problem(s)... :roll:
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Re: 250C2

Postby Ming » 26 Sep 2016 17:26

Some progress, or should that be regression?
Took the silencer off, it looked to be in good condition from the chrome but when I turned it over it was rusted through at the back, then the baffles fell out in dozens of bits from the inlet! The 2 into 1 exhaust is definitely home brewed, the front pipe is in pretty good nick but has been bent upwards by a lump hammer, it has a short spigot before joining the chromed outer sleeve. The rear looks genuine, with a longer spigot to sleeve dimension and 'proper' looking curves under the bike to the integral Y piece.
However, the front pot has a larger than standard exhaust nut, though not as big as a 500! Looks to be turned from mild steel, with circumferential holes for a peg spanner, rather than tessellations. It had 2 large copper washers instead of an exhaust gasket.
Front master cyl and caliper drained and cleaned OK. Forks drained (of a couple of tablespoons of molybdenum grease from the look of it!) so I'll strip and clean them.
The tank key should be coming soon, so I can then see how bad the inside is, start cleaning and decide on the best sealant - Slosh, anyone?
The rest looks OK, maybe a new chain and sprockets, definitely a new rear brake cable. Tyres are nearly new ME22s, seat has a few minor tears and a couple of indicators are damaged.
Ex spigots.jpg
Front & rear pipes of differing spigot length
Ex spigots.jpg (147.93 KiB) Viewed 8180 times

Pipe bends.jpg
Well crafted pipe bends (?)
Pipe bends.jpg (171 KiB) Viewed 8180 times

System.jpg
System.jpg (139.85 KiB) Viewed 8180 times
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Re: 250C2

Postby Ming » 27 Sep 2016 18:04

More pics:
Y piece.jpg
Y piece and rear pipe.
Y piece.jpg (153.01 KiB) Viewed 8176 times

Nust 2.jpg
Ex nut profiles
Nust 2.jpg (146.49 KiB) Viewed 8176 times

Nuts 3.jpg
Ex nut outer ends
Nuts 3.jpg (158.84 KiB) Viewed 8176 times

Standard collets fit both nuts with no problem.
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Re: 250C2

Postby hendre » 29 Sep 2016 07:01

I think they tried to fir a 350/500 header set to the 250... the Neanderthal way
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Re: 250C2

Postby 72degrees » 29 Sep 2016 08:12

hendre wrote:I think they tried to fir a 350/500 header set to the 250... the Neanderthal way


You have to get a bit Neanderthal to fit a 350 system on a 350 engine a 250 frame. It doesn't quite line up properly ;)
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Re: 250C2

Postby Ming » 29 Sep 2016 10:41

It actually fits OK, just looks a bit 'moche' (ugly / unsightly in French)!
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Re: 250C2

Postby Ming » 29 Oct 2016 16:12

Well, for all the ugly bits, mismatched transducers and mystery object, after cleaning the carbs, adding petrol via a lawnmower fuel tank and giving a few kicks - it runs!
Didn't run for long as 1) I had only the open pipe. 2) Tick over was around 4000rpm and I didn't want to do any damage.
Very encouraging though.
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Re: 250C2

Postby RedVee » 18 Dec 2016 14:34

Any progress?
Morinis & Motorcycles - Is there anything else?
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Re: 250C2

Postby Ming » 19 Dec 2016 09:41

Slow at the moment - it is only just above zero in the barn at this time of year. Having said that, I think (hope) all the major problems have been addressed (other than the severely perforated fuel tank) and the bike starts easily enough - even with the 'mystery object' and 2 different transducers - though I need to re-set the carbs after a thorough clean. I'm also working on the carb of my DR350 just now, don't think it's been opened in 20 years and was full of mud.
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