usabulto

Feetupfun, Thank you for your reply and helpful information. When I first looked at the main muffler before I started to clean it up, it appeared as if there were abrasions through the paint that sure looked like copper. If you will go back and look at the all of the muffler photos, you will see that the last small tip of the main muffler definitely is copper. I would have to agree, now, that the rest of the muffler is probably steel. As for the diameter of the tail pipe I am using, I measured it and though it is a nominal half inch, it measures a little over 0.6" (15 + mm) ID. Your 22mm is nearly an full inch. The stock diameter is not that large and the parts book shows a connector that must be 4-5 inches long that turns 90 degrees before it connects to the stock triangle muffler. That bend must also slow down the exhaust gases quite a bit. I am not taking issues, I am just clearifying. I do appreciate your comments. One of the bikes I started out with came with the SuperTrapp and it was fitted with a 4-5" section of rubber hose. I didn't much like that set up. The other had the stock triangle muffler, but it was really beat up and really not usable. In concert with your comment, I have already started making a support for the tail end. See pic below. I will use some sort of padding around the tail pipe where it fits through the support and tighten up the cross bolt "just enough". I used the 45 degree elbow to get the SuperTrapp away from the rear tire. Even now, it will only have about a couple of inches clearance from the tire. I hadn't even thought of how the exhaust would blow out all around the SuperTrapp. Thanks, good information to know. I had to chuckle when I read your comment on the plumbing hardware. Back over 40 years ago when I worked in a dealership, the shop foreman, who was a british bike fan, used to say that Bultaco frames where made out of water pipe. I am sure he was kidding, but then I do remember reading more recently that the choice of frame materials was the reason that Bultaco broke off from the Rickman brothers. That kind of made me think........regardless, the strength of the design and low weight of the Bultaco frames always impressed me. Getting back to your introductory remarks, I believe that my M49 will be quite nice when finished. It has been a ground up rebuild. Below is a pic of where I am at now. The engine is getting all new bearings and seals. The rod bearing looks and feels good, but I am having a machinist check it out. I have a 28mm flat slide Mikuni and leonelli electronic ignition for it, which I hope are not hard to figure out and tune. I first had the idea for this project about 5-6 years ago and am just now getting on with it. I chose orange because that is the color I painted my MK4 Pursang that I raced scrambles and flat track from back in the early 1970's. Working on this project has definitely brought back a lot of long lost memories.....most of them good. Cheers and thanks for your 5c worth. Regards, John

Hello, Here is a pic of the complete exhaust system for my Model 49. I had the header pipe re-chromed and installed a new rubber coupling. Need to get a couple of stainless steel hose clamps and another can of black engine paint to finish up. I am waiting on the fellow to get back to me with the crankshaft. Once I get the crank back, I can begin to assemble the engine. The rest should be just a matter of putting parts back together....I hope. I see that quite a number of people have viewed this thread. Does anyone on this forum reply, or comment......or are new members just boycotted until they say some sort of magic words?

Well, after trying very diligently to make it work, I had to remake the fittings for the muffler. The end of the pipe and muffler were just too close to the rear tire. Don't know why I didn't think of it the first time around, but realized I only needed to use a female/female elbow fitting and didn't need the coupling. This time went with a 5 inch nipple and an F/F 45 degree elbow. Think this one will work. http://s916.photobuc...nt=IMG_1606.jpg Bt the way, can anyone tell me how to post pics without posting your entire photobucket album? Thanks.

Hello Mark, I checked, but my M49 has the newer style outer cases. I thought it might still have the washer, but it does not. You might try calling Hugh's Bultaco in New York (518) 851-7184, or emailing them at: info@buybultaco.com<info@buybultaco.com. Regards, John

Hello, New here, I am rebuilding a 1969 Sammy Miller M49. I say rebuilding, rather than restoring, because I am not trying to keep it "exactly like when new". Just want a good solid bike. I am about to complete the frame, tank, side covers, and muffler. I started with two bikes, one the Sammy Miller and the other a 1970 M49 that I am using as a parts bike. The parts bike had a SuperTrapp T-99 Spark Arrestor in place of the triangle box end muffler that comes stock. It was mounted with a piece of rubber hose connecting it to the main muffler. The stock one from the SM bike simply isn't usable. The SupperTrapp spark arrestsor has 9 baffle plates and a half inch pipe thread. It has very little restriction to flow. See pic. http://s916.photobuc...zps1237362d.jpg I decided to try to make use of the SuperTrapp arrestor, but I really didn't like the way it had been mounted. In cleaning up the stock main muffler, I discovered that it is made out of copper....yeah...all copper; so it's something that can be soldered. I visited the local hardware store and got a few brass plumbing fittings and made up what I think will be a suitable configuration. See pic http://s916.photobuc...zpsa0c427f3.jpg The fittings consist of a two inch piece of striaght pipe, a coupling and a 45 degree nipple, all silver soldered together to the main muffler. See Pic. http://s916.photobuc...zpsf316f16a.jpg When mounted, it points down at about a 45 degree angle and away from the rear tire. I will have to fabricate a support from the top shock bolt just ahead of the spart arrestor. As to how this setup will affect engine performance, I don't know, yet. I hope it knocks down the exhaust bark some. The stock box tail end muffler seems more restrictive than the spark arrestor, but I will just have to get the rest of the bike together and try it out. Just thought I would pass along this bit of my rebuilding experience. Any and all comments welcome.

axulsuv, Hi, I am in Topeka, Kansas, USA. Thanks for your reply. The Sherpa project is coming along.....steadily, if not quickly. Got new bearings and the trans mounted back in the cases. Going to have the crank checked and then be ready to assemble. I will post later in the Bultaco section. The beemer is fun. Its got a fuel line leak that I need to fix. Don't know about entering trials competition. Bones don't heal up like they used to, but would love to attend a local event, if there are any close by, to see how it's done. John

Hello, Found this forum looking for information on the M49 Bultaco Sherpa T I am building. Lots of good information here. Back in the day (early 1970's), I raced a Mk4 Pursang in scrambles and flat track. Haven't had an off road bike in 40+ years. The brain says "Lets Go!!", but the body says, "you're kidding, right?" Got a couple of M49's to build a one good bike, one a 1969 Sammy Miller version and the other a regular 1970 M49. Here is a pic of my starting point after stripping down the Sammy Miller version. http://s916.photobuc...zps2bd3751b.jpg And here is where is where I am at this point. http://s916.photobuc...zpsbd2c0149.jpg Working on rebuilding the egnine, now. Look forward to joining in on the forums.