Kierans type one resto with a few fancy bits.

[VFRkieran]

Took Paul up on his offer went to pick these up:

Pretty impressed with the build quality and they fit without any real hassle. Heres a pic of the new upper and my old one:

Fitted to the bike:

Took the bike for a ride down to H cafe and all is well!

[VFRkieran]

For anyone who didnt see the for sale thread i had some brilliant luck and managed to pick this RVF motor up with a top end problem:

Cost me 15 quids worth of petrol to go down to winchester to pick it up, plan is to completly strip it down find out what the problem is and refresh it. So on monday i started my first engine rebuild:


Got the heads off and found the problem:



The head was in quite a state however the valve surface look fine:


Had a good look around and it seems like something has been dropped into the chamber and caused the problem, i could pick these 4 pieces of metal off the head with my fingernail:

If you ask me that looks like a split pin but im not sure, any engine guru's got any opinions on what to do with this? i assume the head cant be machined and will be shot? And definatly the piston, however the bore looks fine with no marks at all, i will get some detailed pics of the bore when i get hold of a rotor puller and split the cases. This engine had spat a shim out of its holder and that was beleved to be the cause of the noise, so could these pieces of metal have caused a shim to pop out somehow?

Thanks in advance to anyone who can shed some light on this.

[twist&go]

you could get the head skimmed but then you have to geta shim set for the cam holders and other bits and bobs. and it does look like a split pin cant see were that would have come from anywho if i bit of that got stuck behinde the valve that could cause the shim to pop out better get them valves out and check the seats and necks of the valves.
i've heard rumours that the shims can sometimes pop out when the bike goes arse over tit hope some of this helps

[VFRkieran]

Yea i was thinking about getting the head skimmed, are shim sets for the cam holders easy to get hold of and how hard are they to do myself?
The story behind this engine was the lad who had it in his bike removed his restriction washers and on the ride after the bike started sounding like a tractor so i think thats when something must have been dropped in, im pretty sure the bike didnt go end over end because the bike was there in one piece and i must say very clean when i went to pick up this engine. So perhaps a bit of the split pin did get stuck behind the valve, i will remove them and inspect as soon as i get hold of a spring compressor.

Thanks for the info mate.

[twist&go]

no probs matey
if you get the heads skimmed only get .5mm taken off get your self some shim sheet or shim in a can set of tin snips and away you go lol or you could get um laser/cnc cut out but might cost a tad even heard of people just using washers lol.
have a look on luke millars build thread and look for the topic skimmed head in the v4 section theres a drawing of the shims that you need.
also check the finger followers one of them might be damaged or worn

[shep___]

Hi Kieren,

Looking at the pictures I think it's one of the small hose clips off the carberretors.

The only time the chambers were unplugged was when the carbs were refitted and it was a pain in the ass getting them into the rubbers iirc. It must have been dislodged at some point.

[shep___]

One of these things

[VFRkieran]

Hi Paul i was wondering when you would see the thread, i would bet thats exactly what happened then, i know what you mean about the carbs being a nightmare ive heard they are even more difficult on an NC30 When i get the tools sorted i will split the cases and see if any damage has been done further inside going to start a new thread for the engine build i think.

@twist&go i may just buy a new head instead of getting it skimmed, surely it will need some special tooling to machine the damage out of the combustion chamber?

[twist&go]

ive seen heads alot worse then that and people myself included have just dressed it up with a dremel and re-cut the valve seats as long as you havent broken through the head itself into the inlet/outlet ports or water jacket it should be fine.

[VFRkieran]

Something tasty came in the post yesterday!


Im doing a shitload of overtime for a week so i decided to fit it yesterday on my day off,

Old shock out,

New one ready to go in,

After a fair bit of hassle lining the linkages up got it installed, spring got filthy too but i think i might repaint it red or black in the winter when i strip the bike down the turquose looks a bit strange IMO.

No real news on the RVF motor yet, cleaned up the good head a bit but thats all.


Before


After.
im moving into a new house beggining of next month so im not stripping anything down till i get everything moved into the new garage.