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250C2
Posted: 21 Sep 2016 17:31
by Ming
- 250-2.jpg (229.26 KiB) Viewed 21562 times
- 250-1.jpg (106.16 KiB) Viewed 21562 times
Well - look what just turned up!
Looks pretty complete with new tyres too, missing the key to the fuel tank though.
Re: 250C2
Posted: 21 Sep 2016 18:03
by 72degrees
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 ?
Re: 250C2
Posted: 22 Sep 2016 06:47
by Ming
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)!
Re: 250C2
Posted: 24 Sep 2016 07:09
by Ming
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)...
Re: 250C2
Posted: 26 Sep 2016 17:26
by Ming
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.
- Front & rear pipes of differing spigot length
- Ex spigots.jpg (147.93 KiB) Viewed 21405 times
- Well crafted pipe bends (?)
- Pipe bends.jpg (171 KiB) Viewed 21405 times
- System.jpg (139.85 KiB) Viewed 21405 times
Re: 250C2
Posted: 27 Sep 2016 18:04
by Ming
More pics:
- Y piece and rear pipe.
- Y piece.jpg (153.01 KiB) Viewed 21401 times
- Ex nut profiles
- Nust 2.jpg (146.49 KiB) Viewed 21401 times
- Ex nut outer ends
- Nuts 3.jpg (158.84 KiB) Viewed 21401 times
Standard collets fit both nuts with no problem.
Re: 250C2
Posted: 29 Sep 2016 07:01
by hendre
I think they tried to fir a 350/500 header set to the 250... the Neanderthal way
Re: 250C2
Posted: 29 Sep 2016 08:12
by 72degrees
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
Re: 250C2
Posted: 29 Sep 2016 10:41
by Ming
It actually fits OK, just looks a bit 'moche' (ugly / unsightly in French)!
Re: 250C2
Posted: 29 Oct 2016 16:12
by Ming
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.
Re: 250C2
Posted: 18 Dec 2016 14:34
by RedVee
Any progress?
Re: 250C2
Posted: 19 Dec 2016 09:41
by Ming
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.