Pre-65 Bikes

Hi, Would like to know what modifiations should be made to a D14. 4 speed motor to make it competitive and reliable in Pre 65 trials ? Expecting to use alloy barrell, modified Fantic head ?, electronic ignition, replacement carb, etc, etc. Would be great to hear from someone who has done this recently and built a good engine ? Thanks, Jon.

Hi, I am building up a Bantam trials bike from an engine that seems to be a mix of 3 & 4 speed parts. - So its a 4 speed box, and 175cc top end - but it has the old Wico-Pacy ignition - and it has a clutch basket with 3 friction plates. I've been out for one shake-down ride, and the clutch slipped like crazy. My plan is to get a set of new friction plates, and a set of (6) stronger springs. But I just wanted to check whether this is likely to fix the problem, or does everybody end up having to fit a 4-plate basket. Would the 4 plate basket be a straight swop ? Tony P.

Hi Ive covered rim size on a previous post, but thought I would ask the remaing (at the moment) questions in one go 1 - Sprocket size Its a 4 speed engine - unsure of any internal gearing changes. What the best combination of sprocket sizes ? Also- chain, 428 ? 2 - Wheel offet Im about to get new rims built onto bantam hubs Rear (using a widened swinging arm and engine offset 8mm) - I think needs no offset ? Front - I think 6mm offset to brake side ? 3 - Chain tensioner Any advice on best type ? may think of more ! cheers John

Looking for info on converting a D7 into a trials bike for Classic/Pre 65 trials, what mods would you recomend doing to a D7 to get it trials ready? I'm thinking strip down the frame and sharpen up the head angle (what degrees?) maybe widen the swing arm for a slightly bigger tire, alloy tank/seat........ I'd be gratefull for any advice/links/pics etc... Thanks.

Hi, I am another building a bantam trials! I have alot of the bike but am looking for more info. I followed a thread where members were talking about mods and info for bantams and were offering to send on what they had. Any chance of someone letting me have this info? it would be much appreciated. Thanks

Hi members. will someone tell me the best spark plug to use in a bantam 175 for trials use? and the best petroil mix using fully synthetic 2 stroke oil? ???ml per 5 litres petrol. Paul

Quick question buikding a bantam at the moment, whats suitable rim size (building new wheels) cheers John

Hi. Does anyone have a detailed dimensioned diagram for the building of a silencer box for a Bantam B175 trials, using a standard large bore high level front pipe. I have seen a number of nice examples on classic trials websites, but would appreciate help, as I cant find much in the way of trials mods available for the humble Bantam. I would also appreciate a few pointers regarding gearing for the B175 box. Managed to find an 11t front final drive sprocket and a 58t rear but I have heard that it is a good idea to swap 2nd and 3rd gears round before re-assembly of the box takes place. Its all a tad confusing and I'd like to sort the engine next. Hope someone can assist wit…

Sorry to post this in this forum but i've just had a call from a distraught Alan Whitton who this morning has had his van stolen a white Transit connect LWB reg NC 56 KKN now Alan is less bothered about his van because insurance will sort that out but inside was his Bantam rolling chassis that he had on his stand at Telford show along with some Triumph Tiger Cub heads and various parts. Alan doesent have any photos of the rolling chassis and needs some for the Police so if ANYBODY has any piccys at all of the Bantam frame from Telford show could they please either post them on here or let me have them and i will forward them to Alan. Obviously if you know of anybody off…

Hi all, Trying to understand the best mixture for the Bantam, can you please let me know the winning formula?

Is anyone here using a Wes exhaust on a Bantam, have you a picture of it? Does the silencer sit at an angle sloping downwards ??

Hi people , anybody had any experience with this clutch conversion , i have one fitted to my bike , and it as no feel , either on/off , reminds me of a Montesa 315r i had a few year back , mod was fit motorcross plates and play around with different oil , any tips -mods please ...Cheers

Has anyone found an "off the shelf" front brake cable suitable for Bantam/Cub front hub, maybe off another t. shock bike?? Thanks in advance.......

Std brake shoes are 138mm o/d x 25 width Does anyone do a set of 140mmo/d x 25 mm shoes The i/d of the hub is slightly below 140mm(139.8) The brake is very vague and spongy so i thought a larger dia set would be better Any advice?? Marty D

Can anybody confirm for me that Cub sprockets fit the later type Bantam rear hubs i.e. D10 - D14. Lots of people seem to offer rear sprockets for trials Cubs but not for Bantams, I thought they were the same fitment ???

The bash plate i built for my heavyweight Enfield is cracking and dented. It as made of 3/16 inch aluminum with welded "wings". I need something heavier duty. what is the recommended aluminum? Should I switch to steel? Dave

Hi all you pre65 boffins, what do you think is the best 2 stroke bike on which to ride the pre65 Scottish 2 day, for a clubman rider? Please give your reasons.

Ok people I need some advice / expertise. What would be the best fork set up for a 1959-60 James Captain K7 with a Villiers 32a engine. I have been told that Norton roadholder lower sliders with Ossa stanchions and Bultaco internals are the weapon of choice. What are your opinions? Is any one doing reproduction Norton roadholder lower sliders? I know Greeves are doing full sets of MP forks, but at a price?? Any advice - telephone number contacts etc would be appreciated. Cheers. Paul.

Last Autumn, I took to falling off a Bantam, instead of falling off my usual ride. The engine is a 1970 D7, haven't a clue what the frame is, but I'd like some advice with the spark plug, please. The engine is fitted with an NGK BP7ES, and a "Rooster Booster", and it seems to be running OK, but does anybody know if this is the correct plug? If anybody has knowledge of frame numbers, by the way, mine is D13266, any pointers towards when it was made would be gratefully received. John

Has anyone tried the Mikuni off a Beta on a C15 or other Pre-65? The 26 mm size seems somewhat appropriate but I'm wondering if jetting would be a major effort.