Trials-dabbler

While I cannot answer your question directly, looking through the Bultaco (red) parts book, here's what I found. The 106 needle jet is listed (18.15-020/106) for the following models: Lobito MK III, Lobito MK IV, model 74, Matador MK IV, Sherpa T 250, Sherpa S 100, 125,175, 200 and Pursang MK II & III. The 106A needle jet (76.15-020/106A) appears unique, only being listed for the Lobito model 76 series. Same for the 105A (76.15-020/105A) and 107A (76.15-020/107A) needle jets, specific to the model 76. Your 30mm carburetor 76.15-001 The model 76 float bowl (76.15-003) has the notation; "with lowered main jet". I hope this helps some. You have a very nice-looking model 76 Lobito! .

The service manual mentions 250cc - 360cc rod side clearance should be .022 - .024-inch (.55 - .60mm). Section 6 (16 pages) in the service manual is on rebuilding and alignment of the crankshaft.

Welcome!

2022 Beta EVO 80 Senior: It's a fun, reliable little bike for an older rider to practice and improve his basic skills.

Hugh would probably be able to answer your question. bultacoclassic.com

92 SHERPA T 350 1972-1974 92.000.001

Try Hugh's Bultaco. www.bultacoclassic.com

Welcome aboard and Congratulations on your recent purchase. Do you own a Mooney? Let's see it.

Sorry, I exceeded my upload maximum.

With that age of the bike, I suppose anything is possible, for many owners ditched the battery - rectifier. Here's some scans of your model (I believe) and a 125 test. I do have a 175cc Mk V test, of sorts, if interested.

You're welcome. Here's a scan from the parts book that includes your model. It appears that the rectifier is mounted under the fuel tank, but consistency often varied, and your bike may be different.

Not sure on the specs or differences on red & blue coils. On my M84, 175 Mk5 Lobito, there is a red rectifier that is mounted under the fuel tank and a blue coil that is mounted to a bracket that mounts to the rear engine mount, and that bracket also secures the lower area of the rear fender.

Perhaps that site reproduced and sells the individual model 80 parts manual. Bultaco listed the Sherpa T, along with many other models (up to the model 107) in their "blue book" (over 160 pages). If you have something specific in mind, I'd be happy to scan those page(s), but not the entire parts book.

I agree with timdog, for I had the same issue on my 2022 EVO 80, and it was lack of fuel flow related. I fully opened the OEM fuel tap, checked for adequate fuel flow and installed an inline shut off valve. No more issues.