The Vintage Trials Thread

[sdm]

I am running Maxima synthetic @ 32 to 1 in my 247 Cotas and it works well. I probably could go with less oil but I figure if it is not fouling plugs it is good to go. That is a nice 200 Cota you picked up...
Be careful however as 2 years ago I couldn't spell "Cota" and now I have 3 of them! I don't get how that works....
Sam

[LowPSI]

Silkolene Comp 2 is a great oil that burns clean and leaves little residue behind.

All 2T oils will "protect" a trials engine so therefore a "clean burn" is what becomes important.

http://www.silkolene.com/index.php?c...duct&sub=ride#

Since a trials bikes runs at low RPM much of the oil goes un-burned and residue builds up in the engine and exhaust. On some bikes you can see the black spooge leaking out of some exhaust pipe joints.....also the exhaust packing gets soaked in oil and hardens the packing and then performance decreases. That is why re-packing silencers becomes necessary.

That's also why you see 2 stroke trials bikes smoke like crazy after a long hill climb...the exhaust is full of un-burned oil.

[PSchrauber]

Originally Posted by sdm

I am running Maxima synthetic @ 32 to 1 in my 247 Cotas and it works well. I probably could go with less oil but I figure if it is not fouling plugs it is good to go. That is a nice 200 Cota you picked up...
Be careful however as 2 years ago I couldn't spell "Cota" and now I have 3 of them! I don't get how that works....
Sam

Quite a lot oil IMHO this will clogg your exhausts very fast, and you can't replace the isultaion very easy as the exhausts and the silencer are welded! (*)

For normal classic trials 1:75 or 1,5% is standard here in Europe,
for modern indoor events 1:100 / 1% is standard.
To be sure not to clogg your exhaust something inbetween 1:50 for trails and 1:75 for trial is completly OK
when you use synthetic 2-stroke oil like Ipone shyntesis 2 which has a homologation for to be used up to 1,5%:
http://www.trials-action.de/product_...roducts_id=729

Mix it with premium gas and the lowest amount of ethanol you can get.

In the "old" days due to the closed build exhausts, (see (*) ), we got 1:100 or 1% two-stroke oil that was expecially made for Bultaco trialsbikes for example, (Montesa or Fantic, ... had also their own homologated brands oil too).

They don't produce this oil anymore and sadly with the new kind of gas not recommendable anymore. Back then I never had any issues with 1:100 or 1% when using the Bultaco oil, sadly got very fast a problem with Castrol TTS, which isn't bad either but doesnt deliver a full "grease-layer" when thinned so much.

[PSchrauber]

Originally Posted by SnoDrtRider

I took her home and gave her a bath... Here is a better pic after a little clean up.

Very cool and much better then a heavy Bultaco Sherpa (I have a Bultaco Sherpa !!!), the Montesa is much lighter has a shorter wheelbase, ... you can do terrific thing with this bike. Congratulation to your decision.

Here in Germany this model is often used in classictrials, there are also a lot of modded bikes around, here a 330
from Spain:

[SnoDrtRider]

I think the manual calls for 3% but that would be oil from back in 1980 plus good non ethanol fuel. There are some places around that reportedly still have non ethanol fuel but I need to research where to get it.
Thanks for all the info and accolades regarding the decision... I assure you it was purely beginners luck... I saw it on Craigslist and e-mailed the seller and next thing I know I'm making plans to go see it the following morning.
I had second thoughts after reading about the kickstart issues and some transmission troubles but I figured I at least owed the seller a look at for his troubles. Once I saw that it was 99% original and in great shape I figured I couldn't really go wrong.

[motojunky]

Originally Posted by SnoDrtRider

I think the manual calls for 3% but that would be oil from back in 1980 plus good non ethanol fuel. There are some places around that reportedly still have non ethanol fuel but I need to research where to get it.
Thanks for all the info and accolades regarding the decision... I assure you it was purely beginners luck... I saw it on Craigslist and e-mailed the seller and next thing I know I'm making plans to go see it the following morning.
I had second thoughts after reading about the kickstart issues and some transmission troubles but I figured I at least owed the seller a look at for his troubles. Once I saw that it was 99% original and in great shape I figured I couldn't really go wrong.

Was that the one in DE? I was tempted to look at that since it's close to me. I wasn't really thinking of buying, but kept thinking about going to look. Looks like a good score!

[SnoDrtRider]

Originally Posted by motojunky

Was that the one in DE? I was tempted to look at that since it's close to me. I wasn't really thinking of buying, but kept thinking about going to look. Looks like a good score!

Yes it was in Newark... Strange thing was that I had been searching CL for Bultaco, Ossa, Montesa for over a month and it just showed up even though the post date was Nov. 26th.

[SherpaT]

1983 Cota 349.

Do-list:

- Lower the footpegs, 25mm or so.

- Fix the LOUSY brakes. Hopefully Galfer makes shoes for it.

- Try to improve the on/off clutch.

- Remove the chain tubes (it has a chain tensioner).

- Experiment with raising the forks, 10mm or so.

[Sting32]

Originally Posted by SherpaT

1983 Cota 349.

Do-list:

- Lower the footpegs, 25mm or so.

- Fix the LOUSY brakes. Hopefully Galfer makes shoes for it.

- Try to improve the on/off clutch.

- Remove the chain tubes (it has a chain tensioner).

- Experiment with raising the forks, 10mm or so.

- change nickname from Sherpa-t (LOL just joking)
- get some hand squeezing workout tools, that is what it will take. Heheee

Crap, looks like museum quality? drum brakes are just crappy, that is why arhma and itsa wont let you convert to disc, they are that much better even with 80's era calipers, you know? what you can do is sand the pads enough to get that hardened/contaminated layer off, easy here, you want to preserve that 99% of the pads contact the drum area, if you get this out of round so to speak, braking gets worse. I always slightly sand on the drums, kind of cross ways, so it wears the pads in better seems to brake better. that was back in the day, but you risk eventually wearing out the drum area eventually. Some were thinly chrome plated drum inserts. Not positive about montessa, I had the 1975 172 model in my day...

[PSchrauber]

Originally Posted by Sting32

- change nickname from Sherpa-t (LOL just joking)
- get some hand squeezing workout tools, that is what it will take. Heheee

Crap, looks like museum quality? drum brakes are just crappy, that is why arhma and itsa wont let you convert to disc, they are that much better even with 80's era calipers, you know? what you can do is sand the pads enough to get that hardened/contaminated layer off, easy here, you want to preserve that 99% of the pads contact the drum area, if you get this out of round so to speak, braking gets worse. I always slightly sand on the drums, kind of cross ways, so it wears the pads in better seems to brake better. that was back in the day, but you risk eventually wearing out the drum area eventually. Some were thinly chrome plated drum inserts. Not positive about montessa, I had the 1975 172 model in my day...

This is a very nice Montesa, a real machine of the beginning 80's with 350cc!

To your chain tubes, one of the best things Montesa invited, many build these tubes to their other machines to get the chain better protected against mud, ... (I did mount them to my Italjet Piuma back these days!).

The drum brakes are drum brakes you can't expect the power of disk brakes, to get the maximum out of your brakes
do as follows:

- take chalk and appla it to the brake pads, now mount the the brake capilar with the axle in the hub, turn the capilar and engage the brake lever her and then. When you now take the capilar out ayou will see how much of the brake have really contact with the drum, normally only 30% when new pads are insatalled.

Easiset way to align them to the drum is to mount the complete capilar with the pads in a lathe and turn down exessive material. Then you have full contact between brake drum and brake pad:





After milling away exessive material with a lathe:




The trick is to mount new brake pads as the old one are to hard, fresh coated ones are much smoother and do their job very well.

An enhancement would be to place steel inserts inside the drums, these will brake much better,

Last enhancement you can do is to mount grooved brake pads if you want, but these wear quick!


Here the adress for the grooved brake pads: http://www.trialsbits.co.uk/product_...roducts_id=178

[TUCKERS]

This is my ride

[TUCKERS]

other side

[Lurkerlou]

Originally Posted by kanur

Vintage Trials? Yea, we do that.

125 Sprite, 175 Greeves Pathfinder, 125 Saracen, TY 175, TY 250. There is also a 125 Dalesman not together yet.

And the latest, just picked this up last week. 125 Penton Trials.

I have owned this bike before and rode it a lot. In 2001 I won an AHRMA championship on it riding the 2 line and also made the cover of Vintage Views. Then like a dummy I sold it to finance the next putter. Getting it back was like stepping into a time machine. All these years it had been on display in an office and it is exactly like I sold it.

Love your Penton

Here's my Dalesman :)



My dad purchased it new and it was the first bike I rode on when I was 3 or 4 until I got my own bike. I still have it , and love it.

Any idea where to get a cork for the Ewarts petcock?

Awesome thread.

[PSchrauber]

Originally Posted by Lurkerlou

Love your Penton

Here's my Dalesman :)



My dad purchased it new and it was the first bike I rode on when I was 3 or 4 until I got my own bike. I still have it , and love it.

Any idea where to get a cork for the Ewarts petcock?

Awesome thread.

A very nice trialsbike indeed,

To the petcock you might, (I' am not sure), find here the right cork for your petcock:

http://www.domiracer.com/petcocks.html

[Lurkerlou]

I replied to your PM too PSchrauber that is the ticket right there buddy.

10 of them for $6.95 you gotta love that!

Thanks again for the steer in the right direction my friend.