model80

Don't leave us hanging, what the story behind them?

Just about to start my 199A restoration project and I am wondering what is the best way to coat the frame. Would modern automotive paints offer a better finish than traditional powder coating? The reason I ask, is that during our Model 80 restoration (almost complete) I found that the powder coating chipped very easily.

Here is a link to a complete M80 factory parts manual https://drive.google.com/file/d/0Byg8W7RmlNovbXBhWktSb0ZHTkk/edit

If I recall correctly the primary drive flywheel is made of hardened steel, so I'd imaging it's next to imposible to machine.

If I recall correctly the primary drive flywheel is made of hardened steel, so I'd imaging it's next to imposible to machine.

http://www.betamotor.com/nl/trial/bikes

You're asking a difficult one. If I recall correctly your bike has a Mikuni carb, which will give better MPG than a standard Bing or Amal, however I have never come across any hard data to say you'll get 40MGP, 55MPG, or any MPG etc. The only thing I could suggest is that you do a number of circuits of a predetermined route to guage your fuel consumption and establish a base from there.

FIBREGLASS REAR NUMBER PLATE http://www.cambstrialscentre.com/apps/webstore/products/show/5039199

Here are few link on foot peg mods that might helphttp://www.trialscentral.com/forums/topic/55487-what-did-you-do-to-your-bultaco-today/?p=426679 http://www.trialscentral.com/forums/topic/55487-what-did-you-do-to-your-bultaco-today/?p=427038 http://www.trialscentral.com/forums/topic/55487-what-did-you-do-to-your-bultaco-today/?p=427196 http://www.trialscentral.com/forums/topic/55487-what-did-you-do-to-your-bultaco-today/?p=428685

If they are the original shocks the will be Telesco, unfortunately Telesco are no longer with us and spares appear to be non existent, at least when I recently went looking for them.So with no refurb parts available I bought a new set of NJB's (£72 + p&p) and for someone of my extremely limited ability they are fine.

As you say your bike is reasonably well sorted, so before making any changes I would have a ride on a bike that has some of the "mods" done already, so you can judge for yourself before proceeding. The one mod I would definitely make would be ditching the Bing carb for a Mikuni or a Delorto. That not just a mod, but a massive improvement.

I have often wondered what the hydraulic clutch converstion offered by Romero Motos are like.

Welcome to the forum sgh. Fixing up bikes for the kids is great fun and very worthwhile. You must have a great selection of country side to ride your bikes in in that part of the world. All the very best and enjoy.

Not yet, I spoke to in InMotion recently and they are not expecting the pipe until mid to late Sept.

No, but I can understand where you're coming from. The EV, HV, EGV, etc, have a Gold Palladian central electrode with a flat firing surface.Whereas a BP5EY would have a v groove on the firing surface end of the central electrode. As a marketing tool NGK decided to put the slogan "V Power" on the outside of the boxes that the EY plug were packaged in, just confuse matters.

Thanks pschrauber, I appreciate that the BP5EV has a Gold Palladium central electrode.My own experience has shown me that the EV plug will out perform and out last any other plug I've tried down through the years. For one season many years ago, I did use the EG plug in motocross, however I found the longevity to be much shorter than than the EV and EGV. I first used the EV plug back in 1982 in my 199 Sherpa T and it transformed the bike immediately and since then I have used them as my default spark plug in every trials, enduro and motocross bike I've owned since then. I did use their EGV plug a few times but never found any appreciable difference apart from been much more expensive.

You might try a BP5EV they are a wee bit more expensive than the ES, but I have never had one fail on me yet.

Out of curiosity, what spark plug are you using?

Long time Bultaco devotees Romero Motos in Sant Adria de Besos are selling their business. Lets hope a suitable buyer comes along and keeps this Bultaco institution going. http://romeromotos.com/ingles/principaleng.htm

Hi netley any joy with the tuning?

You're very harsh, it was from 1972, just after they finished the Model 93 Though in fairness it wasn't until 1983 with the arrival of the Yamaha TY 250, that we saw a commerically available radical frame re-design in trials. All of the European manufactures of the period were quite conservative and conventional in what they had commercially available to us mere mortals. Also bear in mind that Yamaha were the fore runners in offering a commercially available monoshock system in the MX world since 1976. Some of the other Japanese manufactures didn't catch up (bother) until 1981. When Suzuki produced it's "Full Floater" system and Honda the "Pro-Link" set-up and as they say, "the rest is history".

Hi noel063 I came across the following from pschrauber which may assist. http://www.trialscentral.com/forums/topic/17344-sherpa-t-exhaust/?p=420863

Possibly a 183 from 76/77 I don't think its 159 75/76, if I recall correctly that had round holes in the slump plate and not the elongated slots similiar to the one's in your photo. It doesn't look like a 199/198, as it doesn't have the brackets on the frame to house the gromets to locate the side panels. Thats not to say they have been removed at some stage as the difference between the 159/183/199 frames is minimal. With the main difference in the bikes been how the air box and side panels were attached. Would you have a photo of the companion swinging arm?

That's interesting, as I was referring the original factory item on the 199,199a and 199B which came into Ireland and I had the complete opposite experience with them.Back in the day when I rode an early 199 (1978, red, fibreglass tank model) I repaired and replaced the head steady at least 3 or 4 times. When I worked behind the spares counter of the Irish Bultaco importers (Lindsay Motorcycles) they were a constant seller and when we ordered them as spares from the factory, we only ever received alloy one's. When I recently bought the lazer cut headsteady kit for my new 199A restoration project I bought it as a result of my poor experiences with the original factory head-steadies.

It looks like one Sammy Miller used to sell in the 1980's.