Pre-65 Bikes

Well, with only 2 unfinished bikes sat in the garage I though it about time I started work on another project !! In an attempt to piece together some 'spare parts' I am fitting a 250cc C15 Bsa engine into a Greeves frame. I have stripped the engine and the piston is already at +040 and need a rebore. I have heard of some C15's which have been overbored, what piston can be used and what CC does it take it out to? Any other tips / advice regarding the C15 would be appreciated. The engine is a SS model, I presume it has a racey cam which may need to be replaced.

I notice from previous posts some people are using 'Sammy Miller' Oil tank braced struts, which I assume neccesitate the alloy petrol tank. Does this make the the bike a oil in frame type and not legible for Scottish Pre-65? If it is acceptable, is this beneficial to the side alloy tank. Any comments. What forks are you people using on your bikes, Pre-65 only.

Hi all, Can anyone tell me what frame this is? I know the forks are Greeves and the back wheel looks Greeves aswell. The frame is advertised as Sprite but looks nothing like any Sprite pictures I have found. I need to make a decision tonight if I want to buy it ! 20_1_b.jpe

Can someone please confirm what items are legal for pre65 scottish. I am rebuilding my cub at present and would like to keep within these regulations. i hope at some time in the future to compete in the event. I know I am stirring up a hornets nest but I need to know.

Belongs to both Pre-65 and Twinshock this: BJ: Have you seen the HT3 that some chap in France owns? Duckwizard: Nice Cagiva (Merlin) there too. Lotsa 123's see: Good stuff

What oil for primary side. What oil for gearbox. Any reccomendations greatly appreciated. Also oil not to use.

I see that some of you have fitted 16T Primary duplex sprocket. How does this compare to the standard 19T. I was going to leave my standard primary at 19T and fit the following 13t Gearbox 64t Rear sprocket 420 chain. What do you think.

What is the difference between pre67 A and pre67 B class, is (A) for unmodified bikes???

Can someone help please how do you remove the gearbox sprocket on a tiger cub. Sounds simple. Have removed clutch casing, duplex chain and sprockets and now cannot see a method apart from removing the gearbox from kickstart side. I believe that there is a mod to the clutch side crancase casing to make this easier, has anyone got this ?. bike is later engine with distributor. thanks in advance.

Hi, thanks for help so far, more silly questions now!! Which tyre is ok for a wobbler on a cub? Is it worth the extra cash for an IRC or Michelin X11 or will a Pirrelli MT43 be ok, I need all the help I can get grip wise!! Is the width at the tread all the same as clearance is abit tight. Im on a very hard MT13 at the moment, terrain is usually woods mud etc. Rgds

Hi Happy New Year to you all. Can anyone tell me how much extra clearance a Miller Swingingarm gives compared to the standard Cub one. From the rear face of the s/arm crossmember to the front of the rear wheel axle slot measures 13 inches on a standard cub. I rode a trial on Sun but couldn't complete it, due back wheel clogging up . conditions were bad, thick mud and dry leaves. Oh no more expense!!!

I have a top mount distributor T20 motor 1955. Are the differences with the side points type motor before I start machining on my motor for PVL etc. Is there any benefit to the later side points motor. Would be interested to hear your comments on this.

Hi My new (to me) trials cub has a rear Pirelli MT13 fitted, What is the difference between that and a MT43 rear tyre. The carburation is not good(mk1 Concentric fitted ), at idle its ok, as I open the throttle it coughs and sometimes stalls as the slide lifts initially, ok at quarter throttle plus. I have 120 main jet and #4 slide fitted needle in centre groove. The plug is very black, my next plan is 110 main jet, #3 slide too richen it up off idle, and weaken it at high power thru the reduced main jet. Any help appreciated. triton

PVL Ignition advertised on E Bay from holden Engineering Item number: 7939569891 holden.eng@btconnect.com 2 week delivery apparently. I thought this might interest some of you people.

What is the best carb choice for a tiger cub 200 for Pre-65 events. is there a restriction on tyre choice, ie X1 michelins allowed ?

Anyone able to recommend an engine oil for a rebuilt trials Cub ? Silkolene Chatsworth 30 has been suggested by another Pre-65er. But its proving difficult to get hold of.

I have just rebushed and resealed my Heavyweight forks, What oil is best to use for Trials use?? At the moment I have very light aviation shock strut oil,the forks top out with a loud metal noise when I lift the front wheel. thanks triton.

Anybody know anything about alloy clutch baskets etc to fit BSA B40 ?? Seen one or two bikes advertised and they apparently have alloy clutches. Assume this is not just to save weight but as it is rotating mass will by reducing the amount of inertia enable the engine to "pick up" sharper ? Any of you guys had any experience ? is it a worthwhile mod? If so where can you get one?

Have a tiger cub trials with standard shocks, swingarm and distributor type ignition. The bike has alloy rims and enfield forks (i Think) Can anyone suggest alternative shocks, swingarm,ignition. Any other suggestions would be appreciated.

How do I remove the bottom leg from Cub heavyweight forks, I need to change the seals, do I unscrew the chrome carrier from the leg using c-spanner on one of the 4 serrations or a peg spanner on the inner smaller chromed carrier with 2 holes??? Its a new ( to me) bike and have no manual as yet. Any help appreciated triton