Jump to content


Site Supporter
  • Posts

  • Joined

1 Follower
About lorenzo
Contact Information
Recent Profile Visitors
5,161 profile views
  1. Tonyd - Numbers indicate Mk. 2 Metralla frame and (later) Astro 250 engine.
  2. feetupfun, your 198 cylinder is stamped 165, possibly ?

    • FOR SALE
    • USED

    Sherpa 199 engine unit with magneto. Generally sound condition with undamaged outer covers. Suitable for overhaul/rebuild. Matching no. frame modified to 199A spec. with alloy bashplate. 199A swing arm. Modified exhaust system with lengthened header pipe. There is a current V5c in my name ; 78 'T' registration means now qualifies for Historic Vehicle status, should you wish to use as a roadgoing machine. Please ask as many questions as you wish. More pics. available if required. Buyer must collect.


  4. lorenzo

    Oil leak

    Ninja - + 1 on woody's comments. If the leak persists, check that the gearbox breather is clear. It's a small hole high up on the left crankcase, just forward of the fixed end of the kickstart spring. If this hole is blocked, some have found that this can cause an oil leak from the gearbox or worsen an existing one, especially when the motor gets hot. (The air inside the gearbox will expand with heat, and it has to go somewhere, I suppose..........) On this 199 engine I've pushed a piece of wire into the breather to make clear its position :- HTH
  5. Would be easier to fit connecting link at rear sprocket.....is the chain in two (or more) pieces ? What's happened to chain on lower run beneath brake arm bracket (bottom r/h. corner of pic) ?
  6. Hi - Yes, it's a Cotton, probably Cavalier model about '69 or '70. Should have a frame no. stamped on headstock, which will help to identify it positively. Here's a similar one I owned back in the day :
  7. Hi - You need to find a way of locking the engine/stopping it turning, Put it in 5th./top gear and apply the rear brake hard while attempting to loosen the locknut. HTH.
  8. The spacer in reality is narrower than it appears on the drawing. The frame bracket provides an ideal "chute" for the spacer to roll down and out (to get lost) when the bolt is withdrawn....... Without the spacer, tightening the bolt will possibly deform the frame bracket and makes the bolt likely to come loose. .......and can give trouble even when all fixings are tight.
  9. When you fit the head steady, make sure that the spacer #138.10 - 119 (no. 39 in the illustration) is in place on the frame fixing bolt , otherwise it will not tighten correctly. This spacer is easily lost.........
  10. lorenzo

    199b manual

    Workshop ? Parts ? Owners ?
  11. Yes. Or a replacement spacer, like this :- https://www.inmotiontrials.com/product/bultaco-sherpa-speedo-replacement-spacer-17mm/
  12. Slowrider - Oil breaker :- https://www.inmotiontrials.com/product/betor-fork-damper-top-tin-oil-breaker-each-136-02-105/ Works as I explained in my last post. Preload spacer :- https://www.inmotiontrials.com/product/front-fork-spring-pre-load-spacers-10mm/ Works as explained by feetupfun. HTH
  13. Slowrider - Holes in the pistons are one part of the booster ports, the other part being the slots in the cylinder liner. You need these if your engine is to perform as Bultaco intended. First o/size Mahle piston :- www.francetrialclassic.com/en/pistons-and-con-rods/4403-bultaco-350-piston-with-clips-pin-and-rings-diam-8525-mm.html The hat shaped sheet metal caps you refer to are oil baffles/deflectors (Bultaco called them "oil breakers") ; AIUI their purpose was to influence the amount of oil coming out the top of the damper tube. You appear to have non-standard dampers, and I can't see how the caps would fit, but who knows ?.
  14. Typical mainshaft wear :- Typical wear to sleeve gear bushes (note the step) :- Hope this helps.
  15. Mark - Based on my experience with these engines, your main area of concern is likely to be the crankshaft assembly and its bearings and seals, and piston and bore, rather than problems with the gearbox. These tend to be reasonably robust, although possible weaknesses are covered in feetupfun's post. Did you use heat when dismantling ? Difficult to see, but from your tenth picture it looks like main bearings are possibly loose on shafts........ Are you in the UK ? Don't worry about being quite young and lacking experience - we all were once !
  • Create New...