Identify engine casing

[Pippinz]

I have been looking to buy a thunderbolt/lightning and came across this one but I have never seen one with an inspection port above the kickstand.
Could one of the members enlighten me as to what it is and explain what keep the gunk out

Thanks

[STAR TWIN]

It looks very non-standard. A suitable rubber grommet might keep the mank out.

[Pippinz]

It has really put me off. I remember my early bikes, I was alway so called "improving" them with after market parts or mods but I have never seen a case like this and I don't think it would be cheap to replace that's if I could find one in the first place. Thanks for the reply

[Bess]

Hi,
        There are some on Ebay at the moment, good and bad. A bad example.....

[Pippinz]

OMG not sure what to say about that. Looking at another tomorrow which may not be too shinny but it is used and complete.

[Robspitfire]

Not to much of a problem. Bit of a drastic mod tho for locating the end of clutch cable. The covers come up for sale fairly frequently on eBay and they don't seem to be terribly expensive, so if you like the rest of the bike use it as a bargaining point and buy yourself some thunder!