Tr1AL

@halfway www.birkettmotorsport.com - scorpa - parts books - halfway down the page. SY/TY 125F info.

@Binkso19 If you want budget friendly then you would be better chasing 38mm forks with the yolks/triple trees included then make the necessary mods to make every thing fit. this can end up being quite a task sometimes so you need to have some patience and expect it to cost quite a lot . if you are just looking to mess about on a trials bike I would just buy a cheap bike that already has all the parts on it and works. If you like messing around then I wish you the best of luck. Regards Alan.

www.betausa.com support service manuals beta evo 2009-2015 that will give you guidance the evo model motor is very similar .

I think that is very wise the clutch bearings are probably fine anyway. As you say its an old bike and it isn't really worth the expenditure , it will all work fine even with the kick gears in worse condition than yours are now so you do not need to worry as when you ride the bike the noise is a lot less noticeable. As regards changing the bearings its a doddle there is just 1 x bolt in the centre of the clutch shine a torch there and you will see the allen head deep in the recess this bolt is drilled and has a hole through it for breathing of the gearbox casing so it is weak you must make sure that the allen key that you use fits tightly or it will round off and you will have to drill the head off so care is needed , with luck it may be loose.

@Steveyboy vibrations through the bars can happen if the bolts holding the front of the bash plate to the frame are not totally tightened up also make sure all the motor bolts that hold it in the frame are tight , they do not need to be stupid tight or the motor lugs may snap.

@ Steveyboy The only way to get rid of the noises is to have all those parts renewed IE the kick gear the idler gear the clutch basket and the bush and the primary drive , very expensive . It makes more sense to replace the cluch basket bush/bearings and use a grinder on any chipped damaged gears to smooth off their surfaces where they mesh.

@Steveyboy In short yes it will make lots of noise and it is normal for this to happen regularly if used a lot on a Pro model , a pair of gears for the Kick mechanism are around £200.00 these days and the best way to make sure you don't have to buy a new pair every 5 minutes is to slowly engage the gears before you kick the bike over and also when you fit the kick start do not position it on the splines too far forwards there are two positions that were used by factory riders through the years those were 12 o'clock and about 7 mins past 12. look at old WTC videos on YouTube to see these.

@ cello the World is a strange place BETA probably fitted them like that at the factory , the seal will work like that and probably cause no problems but the seal for the pump should really have a seal that has the open end with the expansion spring near the lip facing toward the coolant , the pressure of the coolant goes against that area thus helping it to seal more than without any pressure. If you check out the TRS trials bike it has a seal for the oil and a seal for the coolant with a gap between the two seals that is within a casing and that casing has a hole, if the pump seal fails coolant drips into the casing and out of the hole so that you will know it has failed .On the TRS the seal for the oil has the open end facing the oil and the seal on the pump has the open end facing the coolant as they should. Regards Alan.

The open side of the seal faces toward the greatest pressure as the gearbox casing should be vented and have minimal internal pressure and the water cooled system operates under a greater pressure to increase the boiling point of the coolant in that closed system and so the open side of the seal faces towards the impeller/pump housing cover.

@ cello RE that crack , to worry or not to worry that is the question I have had motors that had the same near a bearing housing and just left them like that fitted a new bearing and nothing bad happened. If you follow konrads advice and freeze the bearing over night before heating the casing you won't risk making it worse. Unless you are going to weld it and machine it yourself or know some one who can it will get expensive and you may as well look to buy a complete gearbox and casings off ebay etc to get a lot more for your money. If the bearing outer race turns in the housing just use a liquid bearing retainer adhesive such as Loctite 641. Regards Alan.

5

JITSIE made BETA EVO disc spacers/bobbins have these measurements TOP HAT BRIM = 14mm , BOLT HOLE = 6.30mm , DISC LOCATOR BUSHING AREA = 10.20mm . The clutch pressure plate should be under spring pressure and clamping the clutch pack together it should not waggle , if you are referring to the clutch basket moving then that would be movement in the bushing or perhaps the nut that holds it on is loose?. Best of luck. Regards Alan.

@cello www.betausa.com Trials support service manuals EVO 2009- 2015 service manual the motor is very similar to the techno so use that as a guide .Techno details are harder to find now.

@ahell https://www.agbikes.co.uk/products/jitsie-keihin-carburettor-adaptor-pwk28

A farce if you do a farce if you don't . A farce it is then. I think I am just going to start stopping and hopping it at no stop events as no one seems to think stopping is a problem and I quite like the stop allowed rule which is beneficial in some of the very narrowly marked club trials routes sometimes. thanks for everyones input. Best wishes Alan.