Inlet valve came loose,anyone heard of something like that?

[Anders]

Anders

 

I won't discourage you, but I suppose it might be a bent valve that remains open 5 mm. That can either be caused by charcoal in the valve guide or by a too tight valve guide play. In that case the valve sticks in the guide and the piston on his way up the bore hits the valve. 

 

If you are lucky it is a shrinked pushrod as mentioned above. remove the rocker and pull the pushrod. In case of a shrinking you can observe an aluminium rollover at the connection to the steel end caps. You can remove the other pusrod too to compare the length. In that case replacing the pushrod is a cheap repair. 

Thanks.I talked to the workshop on the phone today,that has the bike at the moment,he said everything in the head including pushrods are OK.He said it can only be in the engine,(camshaft?)and that he will disassemble and have a look when it's time.He was already full when I had it toed to the shop.

[docc]

That cylinder has no compression?

[gstallons]

This is beginning to sound questionable . #1 verify the rocker arm adjusting nut did not get out of adjustment , #2 verify the rocker arm adjusting nut did not get out of adjustment . If this is o.k. go to the next step  #3 use a dial indicator to see  where the excess clearance is coming from .

 Do this or have it done and report your findings .

[Anders]

OK .The problem is now solved.

One of the cam followers (inlet on right side) was grinded down 5 mm !!! The camshaft was damaged (scratches).

So,as the camshaft was being removed and the heads were being inspected,instead of installing the same original parts I had the workshop in Sweden sent the camshaft,cylinders,heads,pistons and ECU to Dynotec in Germany.

They are specialised at this problem,and has a camshaft kit for just about every MG model.Besides ,I had thought alot about doing this restoration on my old 1100 sport because of the increased engine life and increased torque ,but never got round to it.

Jens Hoffmann at Dynotec told me I was very lucky there wasn't more damage than there was,like the valve breaking.That would be very expensive.

 

The shop who had the bike installed the modified heads(new stronger springs,ported heads with higher compression and twinspark,stronger valves,and grinded camshaft to give more torque,and ajusted ECU for the new specs)

 

It got abit expensive but now it runs like a dream!!!

Totally different when I ride during subtile throttle movements for example.No hesitation what ever I do with the throttle.Pulls like a train from 3000 rpm.Rock steady idle.

If you think it's worth the money I would recommed it.

Here's a link:

http://www.dynotec.de/

I got the 7902 camshaftkit.