Bultaco

Hi all I'm just finishing the restoration of a M91 Bultaco and I've got as far as doing the wiring. The stator plate I have has 2 gold coloured coils, points at the top and a condensor at the bottom. The problem is I have no wires. What should I have and where should they run too?

I have some Putoline Light Gear Oil (which I think has a viscosity of 98 according to their website) Bit annoying as the bloody bottle doesn't actually state the SAE number. I also have some Putoline ATF (which I think has a viscosity of 175 according to their website) I got them from In Motion Trials, but have forgotten which one to use in the Gearbox and which one to use in the Clutch. I would ring them up, but its Sunday and the sun is shining and I really want to ride my bike.

Hey riders, my current project is a very neglected Lobito 175 Mk4 (model 76). After disassembling and inspecting the gearbox, nothing is broken, but the countershaft has a worn area where the sleeve gear bronze bushings contact. I’ll obviously need a new shaft and sleeve gear bushings, but I’ve noticed that some later 5 speeds had two sets of caged needle bearings instead of the bronze bushings for the sleeve gear. Anyone know if it’s possible to retrofit the needle bearing shaft to an earlier gearbox?

Having a hard time finding lever assemblies with the small Amal style adjusters. There are many for sale online, but the all seem to have the larger cable adjusters. anyone out there know where I can get some? Inmotion is out BTW.

Hi all, my Lobito 175 Mk4 basket case project came with a blue Femsatronic ignition coil that goes on the bracket under the tank. I’ve only seen the reddish colored versions of this coil, which are shaped identically to the blue one I have. The connections look identical as well. Does anyone know if there’s a difference between the blue and red coils, or is one just a later version of the same part?

My Model 85 is finally running after much advice from many of you. Hearty thanks to all of you! I'd like to know what gasoline-to-oil ratio you have successfully used in your bikes. I'm seeing everything from 40:1 to 100:1 recommended for two-stroke motorcycles in general. I'm sure that covers everything from pit bikes to high-level motocross racers. What actually works with the trials and trail bike Bultaco engines? My bike will be used in an amateur video production, so very low smoke output is important. What works, gents?

Hi everyone, will a later style, ‘72-later ignition cover with the clutch arm on the top fit my model 76 1971 175 Lobito with the earlier cover with the clutch cable that enters from the bottom of the cover?

I wanted to adjust the timing of my Alpina 188 (should be between 2.5 and 2.7 mm BTDC) but the adjustment range is between 4.5 mm and 13.5 mm! Do you have any idea what the possible cause of this problem is?

can anyone one help please , i am trying to download and print the parts lists for my bultaco model 80 1971 , i have seen the one on the model 80 resto site but it will not let me down load it ? or perhaps is there another site with it on , i will be very grateful for any help or leads to help my restoration , thanks

I have a 1976 350 Sherpa JM 15903496 with a new bore of 83.4 when fitting a new piston kit what are the top and bottom piston ring gaps ? all input gratefully received

Having a hard time getting the float valve to function on my Model 85. My bike uses a 27mm Amal Concentric. The float and float needle look healthy and the seat looks clean, but fuel gushes into the intake duct and also out the tickler port. I can hear nothing when I shake the plastic float, and there are no pronounced "steps" in the float needle. Can someone suggest other things I can check? Anyone run into this before?

Yes I know it's not a trials bike but........ What year did the pursang engine start being able to have the left hand gear change?

I have to remove the flywheel rotor to adjust the ignition timing of my 188 Alpina. What is the best way to lock the flywheel rotation? I don’t have a flywheel holder (strap tool). Is it appropriate to use the holes in the rotor to put a bracket (to the frame for example) for blocking? Thank's for your help.

Would someone please tell me how the black and green wires going to the tail light assembly of my Model 85 are supposed to be wired? The schematic in the shop manual could easily be interpreted as those two wires being joined together in the tail light, but we know that's not right. I'm inclined to think the green wire goes to the brake light bulb and the black wire goes to the tail light bulb. True?

Well the 199B was running great then the woodruff key which I had thought was in all the way had been pushed out the other side and eventually found its way to the ignition coils on my brand new electronic ignition! crying alligator tears at the thought of buying another one, is it possible to replace those coils? or repair them?

Hi, could anyone recommend brand and type of engine oil and gearbox oil please...? Thanks, Paul.

I'm facing a "pick your poison" situation. I'm painting a Model 85 tank using the common base coat / clear coat process and need to know what to do about clear coating the Bultaco stickers. On the one hand, if I don't clear coat the stickers, I'm concerned that any gasoline spill will dissolve the adhesive, and the stickers will come loose. On the other hand, the clear coat manufacturer isn't sure the clear will adhere properly to the stickers. How is this commonly handled? What works, gents?

In the midst of my Covid199B restoration. Can anyone confirm the actual length of the 199B Clutch Push Rod. As ever thanks for the assistance.

Hi all just returning a heavily modified 199b back to original and seem to have a clutch problem, first off the clutch arm has been extended (more throw, lighter action maybe) and also with both balls and rod in position to set up centre adjuster I screw in to just touch top hat and back out 1/4 turn, but it only leaves about 3 threads on centre pin, not good, I'm thinking the rod is too short maybe, I would like to see some threads above nut face at least, any measurements would be helpful, clutch is operating OK, or maybe a problem at the lever side🤔 Cheers.

Spoiler I have a 1971 Bultaco Matador 250. Checked compression and got 90psi max. Replaced piston rings without rehoning cylinder and got 150 psi. Wouldn't start so I messed with timing and got it to start. It reved really high because I didn't have the carburetor tuned. I shut it off within 10 seconds of running. Went to start it again and it wouldn't start. Checked compression again and now it's at 120 psi and won't even attempt to start. Tore the head and cylinder off and no scoring in cylinder and rings are still intact. Any ideas why compression dropped? Any help is greatly appreciated. TIA.