dadof2

Did you get it sorted? Find what problem was?

Try starting it without the condenser. Condenser resistance should be at least 4 Mohm (M = Mega) HT coil primary to ground should be 1 or 2 ohms. HT secondary to ground should probably be about 3,000 ohm. Source coil should be fairly low resistance, probably less than 8 ohm. Spin flywheel with a power drill, coil should give 18 vots AC or more. 23 plus common. Check points conduct - I have known corrosion between rivets and points parts to become none conducting HT lead continuity. If resistor type lead about 2,500 ohms per 100 mm. If non resistive type only a few ohms.

I have never heard of this on the 348 primary gear. I think that when a woodruff key is used the taper will be steeper, no key shafts have a flatter taper in my experience. It could be you have a mismatch between shaft and sprocket tapers causing excessive loads at the contact point. Are your gears / crank genuine Montesa? Could the gears be over hard / brittle/

Mock you might - remember when the then mighty BSA Triumph and the rest of the British motorcycle industry laughed at those funny little step throughs Honda were making? I am also well aware what a micron is - Honda has been specifying sizes in microns for vehicle parts since 1980s, possibly earlier. I do not know how accurate the documentary was. As well stating the 6 micron tolerance, it said that this was one of only 3 factories in the world that could achieve that tolerance. Other parts of the turbine erection were secret / not allowed to be shown, suggesting seems the company believes it has a lead on other manufacturers. The Hubble space telescope mirror is reported to be ground to an accuracy of 1/800,000 of an inch which is far more accurate than 6 micron so it would seem that these tolerances are achievable. To some extent the 6 micron tolerance is irrelevant. There is little doubt the chinese can produce high quality engineered items and at low cost 6 micron is not that accurate it is about 2 & 1/2 tenths of a thou.

Electric bikes (motors) are not at all stealthy. They emit a huge individual electromagnetic signature.

The spring helps the pad apply and retract correctly. If you run without them and find your pads wear unevenly or if your leever has long / soft travel at first brake application for some time put them back in. Generally trials and mx bikes are OK without the springs, road bikes and cars are not. The larger the brake pad and higher wheel rpm the more important the spring.

This post helps illustrate the problems the sport is facing in having suitable bike classes. Jon intends to have a clear split between twinshocks and monos. A well sorted late Bulto 325 or 340 in the hands of a good (if aging) rider is more than capable of cleaning section after section that will cause a succession of 5s or 3s for 50% or more of the entry on modern bikes. Perhaps modern bikes are going down an evolutionary dead end, a bit like Giant Pandas, maybe interesting for some to watch but apart from trying to survive in their specialised habitat pretty pointless.

I don't know much about USA fuel prices so following applies to UK. It also depends if low capital or low running costs are your aim. Best heater if you have natural gas supplied through mains is overhead or wall mounted radiant heaters. If you are on bottled propane these still work fine or you can run a hot air blower type (needs vents to prevent CO build up). I have a mix of portable electric radiant heaters (expensive to run) but convenient for short times of local heat. I also have a bottled propane blower type heater for taking the chill off the whole garage in really cold weather. Costs about £1 for 2 to 3 hours warmth. If I had any spare room I would have a cast iron stove to burn scrap wood, you can rig up a waste oil drip into these that works really well.

Whether to judge Breivik a hero or not is up to the individual. Certainly there are quite a number of articles on the internet suggesting he is. The point I was making was that you can only push a society so far before some members say "enough is enough" and resort to violence. The line between a freedom fighter and a terrorist is a very fine one, and depending on your point of view not necessarily in the same place. In the late 1900s there used to be quite a lot of country show motorcycle events in this area. They were either uninsured or the premiums were low. A simple "Motorsport is dangerous" notice was sufficient to indemnify the organisers. The government and lawyers started picking away at this and premiums soared meaning events were no longer viable or helpers risked being individually sued. As a result these many events are no longer held. There is a case in North Yorkshire where (at a country fair) people could have a ride on a tarpaulin pulled by a tractor across a field. A woman did so and then started a claim for friction burns. The secretary of the event now personally faces a substantial compensation and legal bill. I do not know the details of the claim that has lead to the proposed legislation as posted by Andy but I do now that a one size fits all rule across Europe is probably not the answer. I have written to my MP (well educated and lives locally) on a range of issues and his lack of knowledge or proper understanding of many of these issues is appalling. Put him in a committee situation where lack of knowledge is compounded by having to compromise and often is distorted by vested interests and its no wonder bad decisions / laws are made.

Some car manufacturers (and specialist engineering companies) have spent very large amounts of time and money trying to get direct injection 2 strokes to produce an adequate combination of emissions and reliability. An indirect injected 2T probably never will be able to meet mass volume vehicle emission requirements. So far none have succeeded. If an engine only has to operate over a relatively small rev range then adequate results can be achieved - certainly an improvement on existing 2T emissions. The ossa is an indirect system, the Athena a direct system which is very different. An off road sport engine, trials in particular will always have to work over a wide rev range. Several car manufacturers are now fitting 8 speed auto boxes to keep their engines in efficient / low emissions operating rev ranges and that is with the advantage of VVT, VVL, complex injection systems.and a pile of computing power to make it all work.

I rode a 434 in 1977 with a works spec engine which I think had been prepared by Lee Bros of sowerby Bridge. It still had the autolube system fitted. It remains to this day the sweetest running bike I have ever ridden. It would trickle along as slow as virtually dead stop in second gear and pick up cleanly and smoothly. I never rode a standard 434 to compare it with but it was noticeably better than good TY175s and a lot smoother than the monoshock engines that followed.

Mont it is then - more metal for your money

In theory on an aircooled engine there will be no difference in performance between a plated and unplated liner as if correctly lubricated there should be no metal to metal contact. The nikasil bore should last longer but plating costs a lot more than just a bore. The big advantage of plating is better heat transfer on all aluminium (no liner) barreled watercooled engines. This enables closer running tolerances, less distortion and less blowby.

Any chance the ACU will raise a finger to protect our sport? It is things like this that breed sympathy for people such as Thomas mair or Anders Breivik http://www.badeagle.com/2011/07/27/anders-behring-breivik-a-modern-hero/ No matter how tragic the event it gives me hope that when a large centralised bureaucracy tries to force its will on others to the detriment of their traditional way of life some stand up and fight.

Are / should be bars 22mm or 22.225mm? 22.225 being 7/8 inch which I think bars are

Because of the minimum weight and rear tyre size limits any significant performance improvements are extremely unlikely, in any case does anyone apart from the top few in WTC need a more able bike? I would like to see: Tubeless front tyres Electric start - do away with kickstart Battery, simplified alternator and car type electrics with OBD Cable operated brakes and clutch

Fair chance your clutch has been slipping, this burns and darkens the oil as well as excessively wearing the clutch lining.

Excellent article. My feeling is that for traditional UK trials in which the majority of sections are uphill and tight turns are common is that the front end should be a shade softer / more sag than the rear when measured with the bike horizontal.

JSP says it only happens in second gear, this suggests its internal gear related rather than final drive chain tension.

Watched a documentary a short while ago on the Chinese SL5000 wind turbine. Very clever especially achieving a tolerance of 6 micron on the machining of a bearing over 3 metre diameter. Also you can buy a chinese "replica" of a suzuki single cylinder 4T 250cc road bike for £2,200. Clearly China has the capability to make things well and cheaply. Sooner or later they are going to put the two together and there is no reason given the potential size of their internal market why they should not produce top spec trials bikes for well under £3,000

I have not tried one but a few things spring to mind. As the load is concentrated on fewer teeth wear rates could be higher. On a trials bike the teeth not only transmit power the keep the chain in line when it hits rocks etc, fewer teeth probably mean more chain offs. Also the present system works pretty well - why change it. Trials bikes have more power than they need, a bit lost due to friction does not matter. If these sprockets really give less friction (meaning more performance and or less fuel used) why is motoGP where any marginal gain important, not using them.

Beta fuel taps both Rev 3 and Evo are prone to leaking, either internally, externally or both. The extra tap has probably been fitted to prevent this flooding the carb / engine. The Beta taps can be cured, they have to be carefully polished internally. The standard rough inside stops the seals seating properly and can damage them.

Pump diaphragm holed / leaking?

Eddie Aitkin in County durham?

Your bike is running rich. Then engine is getting too much fuel for the amount of air. This is not the same as having too much oil in your fuel. From your description and photo it seems your plug deposits are dry, black and sort of fine fur / velvet textured - all indications of excess fuel / lack of air. I am not familiar with which Shercos have a vacuum fuel pump. If yours has make sure it has a return line and that this is clear / functioning properly. Make sure your cold start enrichment is shutting off properly when turned off. Other than that is normal carb checks like float height, float valve cleanliness and operation. jetting etc. You don't state what oil to fuel ratio you are using. Empty you tank and refill with a mix ratio of 1 litre of petrol and 30cc oil and see if that improves running. Check air filter is clean. Examine float valve parts with magnifying glass. http://www.moto-parts.co.uk/sparkplugdiagnosis.pdf http://www.totallyamaha.com/snowmobiles/aaTECH/sparkplug/Spark%20Plug%20Information%20%20Overview.htm Please bear in mind that is impossible to give an exact diagnosis without having the bike to hand, an ignition fault is still a possibility. The spark plug should smell the same or very similar to the exhaust.