Scooterotica

Ok, after having my Gazpacho soup today, I went to the workshop to try finnishing the engine for my friend. Its almost 75% there. Main bearing in, mag bearing in, rear bearings in, gears and sprockets, chain etc...

So here I go, I take the cylinder, following the bible, page by page (thank goodness for Sticky's heritage!) sticking in the cylinder and piston, lining up the con rod, fitting the gudgeon pin, everything kosher so far:

Now is when it gets tricky. I start fitting the head gasket, then the head, then each and one of the nuts of the head. When I am nearly done, I start fixing them up with the socket diagonally. When I start giving the torque to each one of them, three of them are ok, but one of them.... WACK! Still turns and turns and turns. I quickly remove the cylinder head, cylinder, gudgeon pin and piston, to remove the faulty stud, just to realize, that the inner thread on the casing is worn... You can see it in the pic. Look closely at the stud hole:

WTF!! BL %##"!"""!! HELL!!! Oh boy I am mad... If you have any suggestions as to what can I do. I would appreciate them very much.

Kind regards to all and I hope you have a better night than me

It might be possible to helicoil the stud hole. It should be possible to do this with the crank in place, but the other studs will need to come out.

Back in my youth I had a similar problem on a Li150. I drilled and tapped further into the casing to the standard size (M8?) and fitted a barrel stud that seemed long enough. All done in my Mum's garage with the engine still in the bike Not sure I'd recommend this as a decent approach however it never let me down again.

just needs time certing, get on a plane to heathrow......ill have it done in under 1/2 an hour

heli coils are poo

Looks like there might be a split in the casing near the stud on this pic?

Adspeed wrote:

Looks like there might be a split in the casing near the stud on this pic?

No no no no no mate.... the split is just a mere defect on the jpg image, a refflection. No worries on that front. Don't call the bad weather!!

cezeta wrote:just needs time certing, get on a plane to heathrow......ill have it done in under 1/2 an hour

heli coils are poo

So, bro, what are you suggesting? This is a friends' engine so it is not on my expense, I would have it shipped to you if you say you could fix it and it was my engine... Hell!!!

This kit would do it
http://cgi.ebay.co.uk/M8-x-1-25mm-Metri ... 286.c0.m14

I bought one earlier this year, it was a bit cheaper as the £ hadn't taken a dive then

Nick's right,a bit more expensive but a better product than a helicoil. and let's face it you want a cylinder stud solid right?
a local motorbike garage may be able to help to avoid the price of the kit.
http://www.timesert.com/

Supereibar, one question:

the small end bearing you are using, is it silver coated ??? It looks to me so !!

Joder, endonde lo puedo encontrar/combrar ???
Saludos




fishi