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About sherpa325

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    4xbultaco, gasgas300

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  1. 340 Dellorto carb settings

    The standard Amal is 27mm, so not much of a stretch to a 28mm, worth a try anyway.
  2. GasGas 300 Keihin PWK 28mm.

    JJG and JJF are richer in the bottom rev range - F being richer than G Cheers Greg
  3. Sherpa 198 Amal mk 2 carb settings

    The Amal will work fine if the needle, needle jet[106] and slide[3] are all in good condition, these need to be replaced regularly depending on how much the bike is used. It is basically impossible to get the bike to run correctly if the needle jet is worn as feetup said .Pilot should be a 20/25 and main 140/150. The Bings and Amals are particularly prone to wear whereas other carbies- dellortos, mikunis, keihins aren't Cheers Greg
  4. Clutch Drain on ‘73 Sherpa - Help

    The drain plug underneath the left side case in line with the Bul part of bultaco that is cast into the case. That is assuming it has the original case and not the later model case in which case the drain is actually one of the case mounting bolts- the middle one on the bottom and it has a much larger round head.
  5. Sherpa 199a tank change

    Pretty sure the fiberglass tanks are ok as long as there is no ethanol in the fuel.
  6. Sherpa 199a tank change

    If your bike has the original plastic tank it is listed as 1.1 gallons. The earlier 159 - 191 fiberglass tanks are listed as 1.4 gallons and will fit straight on. You could also gear the bike up, standard gearing is 11/39, so you can put either a 12T or 13T front sprocket on depending on the terrain of course. Cheers Greg
  7. Build TY350 Mono as TY250 ?

    Yes the 250 barrel fits straight on, with head piston etc. One of the main reasons the 250 feels a little more peppier is that they don't have the steel band on the magneto flywheel. You can obviously take the band off and run the 350 barrel and see if you like the extra revs. Cheers Greg
  8. Clubfoot verse Banana Muffler.

    I have both at home and have tried both. For me apart from the banana looking a bit neater and being a bit lighter the clubfoot performs significantly better in all respects. The engine has a wider spread of power and more torque off the bottom with the clubfoot.The banana is noisy anyway and reminds me of the drop off in performance I get when my gassers exhaust needs repacking. Cheers Greg
  9. bent kickstart shaft

    The shaft more than likely will be bent where it changes to a smaller diameter just past the return spring. You could take measurements from the magneto case mounting bolts to the hole for the shaft [in the case, as this will be the ideal measurement] and compare them to what you have on the actual engine, this would give an idea of the extent of the bend and in which direction. If you plot it out on a piece of paper, the four measurements will give you a good visual of your problem. Another way would be to make a template out of ply or MDF that mimics the timing case holes. If you bolted this in place again it would show you the extent and direction of the bend, you would need holes/cutouts for the flywheel and sprocket and a larger hole for the kickstart shaft. You can use a try square against the shaft and template as you try to straighten it. However Its going to be a bit of a gamble trying to straighten it while still in the bike.
  10. bent kickstart shaft

    I thought the 199A ones were slightly shorter, as the newer ignition case was/is narrower by about 10mm
  11. Sherpa engine stops every 60min riding

    I had a similar problem and it turned out to be a brand new set of points that had a poor connection where the wires attach as the hole was not fully tapped through. It took me countless hours to find the problem as I thought the wires were tightened up against the screw, but the screw had bottomed out before putting pressure on the wires. But as everyone has said replace the condenser first [I bought one from a mower shop once out of desperation and it worked fine] and check all your wiring joins as well as the kill switch and your earth. Cheers Greg PS a faulty condenser can still give a reasonable spark when you are kicking the engine over!
  12. Sherpa fork springs

    It makes sense that they would do that I had a quick look in my shed and found two leftover springs one is 475mm long 59 coils and 3.9mm dia steel the second is 463mm long 50 coils and 3.4 dia -so a fair bit softer I can remember trying some Alpina springs back in the day so the longer one could be Alpina but I am not sure
  13. Sherpa fork springs

    The M158, 182, 190 250's have shorter sets of forks than other sherpas and I would assume they need different shorter springs. I am not sure of the actual measurement but your supplier should have known that. My guess would be the springs protrude about 20-25mm out of the top triple clamp before assembly, which is a lot less then yours. Inmotion list Sherpa forks at 500mm so I reckon you have springs for the standard forks and the 450mm one in the bike was the correct length original. Cheers Greg
  14. Sherpa T mod 183 bent swingarm.

    All swinging arms from 158/159 250/325 onwards will fit. They were lengthened from 182/183 onwards [about 10 - 15mm] The shorter ones have a triangular rear shock mount and the longer ones have a rectangular shock mount. I am pretty sure a 199A arm is just the earlier one with a gusset welded on, which wouldn't be difficult to copy. I rode Bultacos for years in competition, and still do, and never bent or twisted a swinging arm and I would think I you are going to restore the bike and ride it in the occasional event a standard swinging arm would be fine. I have however seen a couple of bent ones and I was thinking it may have happened if the bike was ridden with one bent rear shock, causing one side to 'bottom out' before the other. Bent shocks back in the day were very common and some riders would continue to ride the bike in this condition, particularly if the binding/bend didn't occur until close to full compression, as this was difficult to feel. The original Betors were very good when new but did not last very long and were very easy to bend. The bike you have bought looks very good and original and should prove to be an easy and enjoyable restoration. Cheers Greg
  15. Busto and Fajardo to Gas Gas

    Plus Dabill and Grattarola in the top ten if they stay on Gas Gas and Farre, Price and Noguera just ouside of the top ten.