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If it isn't a cable with Teflon, I use caramba. To lubricate the nipples in the lever I use conventional grease. I think Teflon would tend to swell/expand when you use oil. I think they are developed for usage without oil. Felix

Hi. If it isn't oiled by the manufacturer you should do it. I allways use oil for foam filters (from putoline). It is very sticky and does a good job. Felix

The slide looks very good and doesn't have any wear. There is just a tight clearance between slide and case, so it will work for a time I think. Setting also seams to be good, there is only a little bit smoke sometimes but not much and only when I ride upwarts a hill wide open. At the moment I run 1:40 with fully synthetic oil. I think it should be ok . Felix

Hello all. The problem is solved. Probably it was the vent which wasn't in the primary cap or it was the seal which was worn out (no sharp edge on the lip). After 30 minutes I was excited and watched to the exhaust pipe every 100 meters, but the smoke didn't come, not even after 1 hour and 15 minutes. Due to the fact that the problem allways started after 30 minutes and now it wasn't there, I think it's solved. By the way, I think the Bultaco has an Amal MK1. Is that correct? Felix

Ok, I understand. Felix

In germany I've found the "Kreem wei

Hi. @Peter: Thank you . There is mounted an Amal carb, but it works pretty well. I only had to do some adjustments at the idle screw and now it has a good throttle response which wasn't so good before adjusting it. At the crankshaft is an O-Ring between sleeve and bearing but I didn't change it because I don't have one at the moment. The seal holder has a paper gasket which I degreased and mounted with Hylomar. If the primary vent is allways in the cap, this could be the source of the problem because there was no hole in the cap. I drilled a hole in it and put a little tube in it which ends behind the engine near the swingarm. Hopefully the wether is good tomorrow, then I could do a test ride. I'll report. Bye, Felix.

Hi. Thanks so much for your reply. The idea with the vents seams to be logicaly, I didn't think about this. But is it possible that there are no holes in my filler caps? Both are made of grey plastic and they seam to be stock... Maybe I should drill a small hole in each of them and put a little tube in it. Yesterday in the evening I removed the primary drive casing and modified the crank seal holder because my Bulto dealer has send me a bigger and wider seal as this one which was in it. The new seal has two lips (with two springs) whereas the old one only had one lip and one spring. Maybe this could be an improvement. @swooshdave: A friend of our family who comes from Nederland gaves me the Bultaco. I don't know who the previous owner was before our friend owned the Bulto, but obviously he did grind the frame and engine serial number away. But here is a picture. Like I sad I think it must be 1971-1972 because the frame should be build in this years and also the front hub with its brake should be '71-'72. Only the silencer is from a later model I think. If the year of construction would be 1971-72 would it then be a T73 or T80? I don't really understand the way like Bultaco have named their models, it's a little bit confusing for me. edit: I forgot the picture. Bye, Felix.

Hi I'm new and I come from germany, so my english maybe isn't so good sometimes. I have a sherpa from 1971 or 1972 (don't know it exactly) with 250ccm. If I ride for about 30 minutes everything is ok, but then it begins to smoke and doesn't want to go to high rpm. If I then ride a few seconds at full throttle for about 10 seconds it's ok but after another 20 seconds normal ride it begins to smok again. Seams to run too rich but closing the fuel tap doesn't bring any improvement. Also I've allready thought about dirt in the float-valve (is that the correct word??) but adding a fuel filter also didn't bring any success. Yesterday I put the condenser under the tank because I thought that it is too hot and so the spark isn't good enough but today I had the same problem. But today I noticed that the smoke doesn't smell like my 2-stroke oil but rather like gear oil. At the moment I think about the crankshaft seal at the transmission-side but I don't know why it should only leak when it's hot. Do you have any suggestions for me? Is it possible the seal only leaks when it's hot? Thanks, Felix.