Yes l too discussed This topic with Reinhard and Thorsten (kattho) the longer lever is the easiest was to "tune" the clutch. Thorsten once tried out the smaller clutch basket of the 125cc, but did it just once. He now as mounted the lever mechanism from the Jumbo unser the petrol tank to his 320 model wir very good effect.
You might ask BRT40 he used special springs and a special handlever.
The lever mechanic unser the tank in combination with longer lever at the clutch seems to ne the most elegant ..
anyway I don't use the clutch very often ... still pleased with what I got now ...
To the dented petrol tank, I personal would leave it as it is, doing more important things first like the airbox, then the bend rear brake does the rear brake work well?
In the meantime I would too sort the rusted parts, getting them de- rusted and plated (home solution) see YouTube for electrolytic de rusting and zinc plating.
Mmmh ... bikes appereance looks weird very much work in detail was done to make a new seat, new fenders were mounted but the foot pegs and rear brake were left rusty crusty, as the hole exhaust, as too the air filter setup is not my personal fashion.
No idea the bike seems to be in "unbalanced maintaining" status the seller spend some GBP for a neat seat and new fenders and Aldo claims to have the engine rebuild but haven't had the time and mony to do a wire wheel job to the exhaust together with a 5E can of rattle can paint ... ??? thus I would have asked for bills of the engine rebuild, probably I' am too sceptic in this matter.
The exhaust pipe is very long, compared to other four-strokes did you try to mount the center box instead of the rear muffler, or is the bike then too loud?
Mmmh ... I still think it was a mistake. The easiest was to avoid is to mark the gas can and drinking can so individually that anybody will see it on First spot.
For likewise things I use yellow duct tape and write with big letters in red my name and bike on.
Running 66.67:1 in all bikes which is equal to 75ml of oil to 5.00l of gasoline. Do this for mono's and twinshock bikes from 1979 up to 1988, aircooled and water cooled engines no problems so far. No special oil beside ones with low flammpoint. For gasoline only gas without any ethanol, like ARAL Ultimate or likewise.
Forgot what do I miss ... not much ... Things change with the time.
People in general were more punctually, schedules had only to be made once and there were early a change, last but not least people were more bound to what they said, these three things have changed to the worse.
Really ... IKEA has done a lot for a better design in Budget furniture.
You can complain about some of there "invention's" depending the junctions of pieces but in general their approach has brought commen sense in furniture.
May be for those that haven't seen the inside interesting, here an opened rear silencer,
with the hole tube in the first section and the chambers and tubes inside the rear section.
The first section works as an standard absorber, the rear section after the Helmholtz principles:
Her one of many possibilities, in comparison (top original, below modified):
From the rear:
The Helmholtz section works nice each chamber or hollow is different so when the fumes go through parts of the noise spectrum will be filtered away or weaken, any way due to the small openings the system provides a constant back pressure.
Which limits the "free breathing" of the motor, it would a likewise effect to close partial the openings to the air box. BUT as the standard 2stroke engine has flushing losses (beside the exhaust fumes alsofreshgases exit), most 2strokesneed and have areturn flowfunction, provides through a pipe that has a cone tube that opens slowly and then is closing in diameter again. The original shaped mid section of the Bultaco doesn't have any cone form beside the end of it were a small hollow is, see picture:
So with none additional "back pressure" you might get a worse performance, the solution in the picture above show a bigger hole oval shaped hole tube that has a slightly s-shaped curve inside which is in own experience a good compromise between a straight tube with no back pressure and the original one, too isn't visible at once narrower then the original and quite lighter. (a suggestion of manypossible ...).
The noise reduction system of the rear silencer is based on the Helmholtz principles using different volumes' and different sizes of tubes. As it is constructed now it works for all noise levels that comes from the engine. You can leave the system too as it is as build up crud can't effect it much.
Anyway the rear silencer build up a permanent resistance of "air pressure" against the complete exhaust system that is mounted before the "chambers" and tubes. Thus providing less noise but too restricts the performance here the build up of motor revs., one of other reasons the bikes with this era and silencer react/respond so slow to throttle.
If you want that the bike react faster but deliver as less noise take out all baffles and tubes and place a hole tube instead through the complete silencer. The diameter around 25mm. Then fill the hollow between the hole tube and the rear silencer well with insulation, the modern stuff works best mineral insulation less good.
But the insulation will soak up oil residue and after a time your bike will sound louder and you have to replace the insulation (the backdraw) but the engine will respond better (the benefit).
That's easy here the pages of the manual for the TR34:
For timing I suggest to use 1,6mm before TDC as stated in the manual, 1,8mm makes starting more difficult especially when the engines is cold,
(at least in my experience the motor doesn't like to start when it's colder outside, probably the Italian genes? but once warmed up starts then easily,
For easy cold start I lean myself standing in the footrest on the bike against a tree ... then a good firm kick were you can put your body weight in.
Then mostly nothing happens after first while the second kick then awakes the engine).
I too use for trials riding a colder plug (manual states Champion N3C which is between NGK B7ES to NGK B8ES) which makes starting also easier,
the B7ES plug looks too much better and doesn't foul as easy then the B8ES, but it's probably just my riding style, if your plug looks really good you
Pretty perfect replies to your questions I can't give any better hints. Just one in own experience: Try first to get the bike running proper, when the bike is running well and all mechanical issues are done and you still want to do "cosmetics" it's much more easier to do it then.
Hopefully the bike will already look good when it's functionality back. I have done two restaurations that ended in a shiny bling outcome. But personal will not do this further more as it's a pitty to ride them in the dirt.
The follower restauration I have done were "just" to the technical and functionalities of the bike also solving originality issues from former owners. And I like the outcome much more as there is still the original paint and fenders the paint may be discolored the plastics may be faded but they do look gorgeous this way and maintained.
Best thing is you like to ride them too and I believe too as everybody is doing resto mods too these real original runners will be more worth in the future.
I can confirm that numbers an EU Historic trials licence in D is 200€ a year, for international modern 319€ a year,
at least approved by the FIM and written in three languages ... for any rider over 50 years you have to ad the costs of a medicalfitnesstestwithECGandallthe trimmings thus you have to add another 100 - 200€!
I have forgotten ... our license includes an insurance for the rider and the bike:
- partly disability benefits: 32K Euro
- full disability benefits: 64KEuro
- death: 16KEuro
- medical expenses: 10KEuro
- medicalrepatriation: 4KEuro
- rescue costs: 3KEuro
- repatriation death: 2,5KEuro
- technical help: 1,5KEuro
- Immediate solutions withserious injury: 1KEuro
Very low...
for substance help for 50KEuro add another 131 Euro, for 110KEuro add another 242 Euro.
I can confirm that numbers an EU Historic trials licence in D is 200€ a year, for international modern 319€ a year,
at least approved by the FIM and written in three languages ... for any rider over 50 years you have to ad the costs of a medicalfitnesstestwithECGandallthe trimmings thus you have to add another 100 - 200€!
Moving the axle of the swing arm as much as possible towards the front sprockets will - as already stated - reduce load sequencingreaction a lot.The distance between the front sprocket and the swing arm of a Sherpa is quite impressing so I think that effect (which hardens the the rear suspension will be much less noticable). In my experience bikes with "short" swing arms do too have the tendency to have a more nervous rear when rolling over "bumpy" obstacles like a field of bigger stones for example.
That's one of the reason why the Majesty TY had got an about 30mm lengthened swing arm.
Yes that makes sense. The numbers are equal and Somalia and Sudan, ... well there might be some translation issues too the communication wasn' t as good then. It can be that the used military bikes which had seen service for at least four years got an "refurbish" before they were sent abroad.
This procedure is at least very common in Germany when used military stuff from the Bundeswehr is sold to foreign country's by the government it get overhauled by the factory were they were build. As CEMOTO was already paid through the government why shouldn't they hit two birds with one stone and let them overhaul the bikes from them before they were sent to Somalia.
That's quite a huge study project thesis!
OFF TOPIC MODE ON
Anyway cool incident I was too at the Military Police (Feldjäger) in the Army during my service time and had too ridden bikes sometimes in my army service time, mostly we used cars. We had Hercules offroad bikes and BMW street bikes. The Hercules was a little bit to much underpowered and I managed to break the frame off one when riding in the woods. My service stations were spread over Germany Celle 3 month, Sonthofen (Alpes) 6 month then Bremen, in between Wilhelmshaven and Bremerhaven (in service for the US Navy).
Not really you can read the sentence as 100 Metrallas for Spain and additional 200 Metrallas for Sudan, but too 100 Metrallas for Spain and 200 bikes of a different model (not named) to Sudan???
I'am still a bit astonished about the Sherpa's sent to Tahiti and Guatemala.
Didn't knew that Montesa were too machined in Scotland. But found two additional articel about Bultaco.
One article showing the cringled exhasut manifold on a Bultaco Sherpa and stating that there are 280 workes but just 100 are really working and the wish there might come new models.
Additional an articel about the Italian Montesa model 242 that got a separate gas tank which is lighter and more resistant, both published 1984 in July Issue 100.
May be a hint for research of the last Bultaco Sherpas a longer articel about the recent past and futur to Bultaco and the other two Spanish brands,
published in December 1984.
In short:
The introduction refers to a law in Spain set up by Franco that workers in a factory from a given size can't be dismissed and that the former social
democratic goverment don' t wanted to change this law for political reasons.
The previous owner and his family hadpartlyunder pressure from theworkers partly voluntarilyleft the factory.
That Cemotoisstill existing isdue to the tremdous suppoert of some employeesandforeign importers.
The production numbers are to low to employ280workers, thus there are only working around 50% of the workers while the rest were paid by the goverment. ...
The monthly output were recently (1984) around 100 bikes per month, which equals to 30 to 40 workers, with 140 workers the output shuold be 500 to 600 bikes.
At the Moment (Dezember 1984) work is done by orders.
The followingordersare:
100 bikes model Sherpa T250 and T350 of which 80 bikes are for UK, France, Venezuela, Tahiti, Guatemala and Japan.
100 bikes model Metrallas for the Spanish army,
200 bikes model .... for Sudan.
More long-termcontractsare missing. On average50%of the motorcycles were builtfor export.
For better sales the bikes have to berevised thus Bultaco want toconcentrate on themost successfulmodel, theSherpaT.
Changes to the Sherpa T: - new color, - altered and improved gastank seat design, - improved engineprotectionplate, - primarykickstarter, - progressiveclutch action, - shorterand revisedwheelbase,
Acompetitivesupportwith ownriders, weill not happen due to the cost.
There are high hopes in the new MK 15engine,thisengine shall beusedmainly in thePursangandFronteramodels.
To the article as previous mentioned. The improvements done in UK were too sent to Barcelona so that these could be integrated in the production but it did not happen. Also back in summer 1984 were the rumors that there will be an upgraded trials model in the end of 1984 available. But it did sadly not happen. I have to look up in the old issues when the end of bike production was announced.
I did a quick look about improvements and news about Bultaco back in the days, but there were very few. It was noted in Trialsport issue 101 from August 1984 that there were made improvements to the Sherpa as for example the longer swing arm with a more forward moved swing axle and that the modification was made by Reg May on behalf of Comerforts and that these improvements were sent to the factory and ones hopes that there will be the development of anewmodelat the end of1984.
Barnett Clutches
in SWM
Posted
Yes l too discussed This topic with Reinhard and Thorsten (kattho) the longer lever is the easiest was to "tune" the clutch. Thorsten once tried out the smaller clutch basket of the 125cc, but did it just once. He now as mounted the lever mechanism from the Jumbo unser the petrol tank to his 320 model wir very good effect.
You might ask BRT40 he used special springs and a special handlever.
The lever mechanic unser the tank in combination with longer lever at the clutch seems to ne the most elegant ..
anyway I don't use the clutch very often ... still pleased with what I got now ...