carl ekblom

Interesting. Thanks

About the countersunk screw....When rounded sometimes you can take a hammer and bang in a torx bits. Not perfect but can work.

To get correct setting I use steel lock nuts (not nylock). Locking wire is not needed. Much easier.

Might be of interest. I have one Femsa flywheel for 340 marked VAR 41-52 and one for 250 marked VAR 41-51

Perhaps try these people https://www.feked.com/triumph-bsa-front-brake-shoes-6-conical-hub-tr5t-tr25w-b25-b50mx-b50t.html

I bought mine for Bultaco from here http://www.mid-atlantictrials.com/Sales.html. Works well on Bultaco Sherpa. They have one kit for Montesa 315

v1nn1e: Your calculation is correct 1.5% is what I use for trials two strokes or 75ml/5 litre Or Aspen 2-stroke petrol which is 2%. /Carl

I don´t know about Bultaco Amal settings but a slide with no 1 opening.......That sounds incredibly rich. I think something between 2,5-3,5 would be normal. Throttle opening comes into effect just above idle and flattens out at approx 1/4 of opening where needle and needle jet is more important. I see Inmotion list thottle valves with 2,5 to 4 openings.

I use Electrex Bultaco ignition and Champion N11YC at 0.6mm. No problem att all so far Carl

I don´t know anything about Yamaha clutches but generally speaking: Clutch centre and clutch basket must not be notched and clutch plates must be in good condition. I think thin oil is better than thick oil. I use engine oil 0W-20 to get a drag free clutch Carl

But... ..would not an Indian Bullet engine be considered as pre-65? I think they should. And to gain ground clearence you should cut the oil filter away.

Bullet forks are pre-65. I am not shure about the MZ forks? For modern steering you need 20-22 degree headstock angle and a front wheel spindle that sits 60-65mm in front of headstock centerline. This will give you a proper rake with a 21" trials front wheel You can use parallel yokes with (1)all offset in the yokes. (2) Yokes with part of the offest in the yokes and the rest in the lower fork legs (like modern bikes) or (3)nonparallel yokes. Bultaco Sherpa use a combination of (2) and (3). I use a modified (replica) Crusader frame (20 degree angle), Ceriani forks (1961 type) and my own nonparallel yokes for a front wheel spindle offset of 65mm and I think it steers well. Carl

I heard he was very sick. It seems that the cancer won.

Hello This is what I found in my Bing carb for my 199B Idle 45 Needle jet 2,73 Main 123 Markings on throttle valve and needle are difficult to understand but needle was in 2nd position from top.

Gold Fren was no success for me. Brake disc must be very clean. I use aceton to degrease and Red Galfer brake pads as I think they are the best /Carl

Yokes for Sherpa have approx 1.5 degree rake moving front wheel something like 20mm forward

This is what I use mikuni vm26: Needle 5C23, throttle 2, main jet 140, idle jet 30, needle jet O3, needle first groove from top (French Trial Classics jetting). Air screw is 1 turn out

It might be as simple as closing air screw and make adjustments to needle position. Basic setting for air screw would be 0.5-2 turns out.

It´s easy to hit the electronic rev limiter. Even I do it sometimes. The very high steps you manage to master need speed. Perhaps you should change the gearing (larger front sprocket or smaller rear sprocket). Main jet 125-130 would be fine.

"These tyres are the brand new 2017 model with the re-designed bead to fit modern rims better. "

Inmotiontrials now stock something they call "The New IRC Tubeless Tyre". https://www.inmotiontrials.com/new-irc-tubeless-tyre-now-stock/. Design changed?

Well, I have some experince of the PHBL carb. I see Dellorto UK list the D40 needle for Tiger Cub. Replacing the D40 needle with D34 will make the mixture slightly leaner at low throttle openings. Idle mixture screw at 1-2 turns out is perfect. Needle chart is here http://www.dellorto.co.uk/wp-content/uploads/2015/05/E-D-Needle-charts.pdf

A 4-stroke is approx 30% more effective than a 2-stroke resulting in approx 30% less fuel consumption.

Someone know if there is any tough classic (or pre65) trials in northern Europe (Holland, Belgium, northern Germany) and apart from pre65 Schottish which are the ones in UK? I would like to attend a couple of them next year but don´t know where to go. Ventoux looks OK but it seems to be in southern France . What about Bilstain?

I have just measured a few of them. Renthals were close to 7/8 the others were 22.05-22.15. I think 7/8 is correct.