Exhaust collar leak and C Spanner

[NickHorn]

I recently bought an MZ TS 250/1. After a couple of rides I have noticed a small amount of smoke coming from around the exhaust collar on start up. The front of the engine is splattered with black oil. I am hoping it just needs a new exhaust seal. I don’t have a C spanner for the collar.

Firstly could there be anything else causing the smoke?
Secondly what size C spanner do I need?

Cheers

Nick

[Louis Mair]

C-spanners appear in the manuals. I have never seen one and I once bought a brand-new TS150. Stripped or damaged threads in the aluminium of the cylinder barrel are not unknown. To have a look at the barrel thread remove the exhaust bracket bolt under the engine, unscrew the collar at the hot-end and loosen the rear mount a little if necessary. There is no seal. Ensure that the thread is correctly engaged by screwing it in by hand with minimal force (fine thread, many turns required). A drift and a hammer are useful for final tightening, you could also use a pipe wrench / stillson.
Good luck!
Louis

[Kenney]

Try a new seal and some exhaust paste to seal pipe to cylinder, tighten as far as it goes, try & tighten once more, my 125 uses a copper gasket to create a seal, I feel sure the 15t0 will have the same.
Regards Ken

[DAVID THOMPSON]

copper gasket

i found one that fit a bike i was working on once
it was the seal on the fill plug for the rear end of a cat dozer
so see your local tractor spares guy he may have one from something that fits
dave

there is a parts company called dorman
they supply an unbelievable assortment of all kind of small parts
here in my area one part house has a whole room full of there stuff
http://www.dormanproducts.com/
a gold mine if you also fix cars

[Old Dog]

Stop!

They don't have a seal copper or otherwise. If you must fuss then remove the collar and give everything a clean up, copperslip on the thread and carefully (really !!) put is back together, cross threading fine metric steel into alloy is not uncommon. Watch your mixture (petrol/oil) and wait for the carbon to do its work. I wouldn't use paste in there ever!!

good luck and let us know how you get on.

[djsbriscoe]

When I had my ETZ and TS I used an old combination spanner for a bicycle. The old spanners have a C section that's used to tighten the handlebar headset/bottom bracket . Look on ebay

http://cgi.ebay.co.uk/Draper-Adjustable ... 20b98c1bd4

David.

[HENRY]

I found a similar problem with my ETZ 125. Although I used some the stuff from Halfords in a tube to seal around the joints I found that I was not getting the angle of the front pipe correctly into the outlet port (sorry incorrect name/term -where it fits into). I lifted the pipe up a bit and angled it slightly when tightening up the collar so as to get the tightest fit possible. I couldn't previously undestandstand why it blew slightly.

[Spitfiregoggles]

I use a C-spanner that came with a pair of Hagon shocks for tightening/undoing the exhaust on my ETZ251; hand tighten first, then use the c-spanner, with a final few careful taps with a hammer to make sure it doesn't work loose. Again, no gaskets, compounds, etc., used and mine does not leak when tightened up in this fashion.

[DAVID THOMPSON]

do be careful getting them cross threaded
i have worked on several old bmw bikes that
had been cross threaded its a mess when that happens
dave