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Discussion in 'Trials' started by Gham, Jan 12, 2013.
There's a 92 Aprilia for sale on Des Moines craigslist. Sharp looking bike with rebuilt engine.
I was riding stuff from the 70's back then. I hope to have something from the 90's soon!
Is she yours?
Aprilias ran the Rotax motors?
Wow, going back to 1985 for me. Started on a Bultaco Sherpa T, painted it several times, it hurt me several times. Then trials nirvana, Yamaha TY350 mono shock. Bought it off Generator George Nadle in Plano Texas. That bike evolved into a John Shirt wonnabe. My first new bike was then on to the Fantic 307, really the best balanced bike I ever owned. I would watch a half hour of MASH every evening in the garage balancing on a dead engine. The KeeRoo sucked, I hated that bike. Then Aprilla's came next, the yellow and blue Climber I called the John Deere. It could climb anything as long as a turn was not required. Then and finally the Gas Gas Klubber came to town with Andrew Codina. Been riding Gas Gas since. Dale Malesak has been incredibly good to me for a long long time, always there on race day. I think I have owned 9 Gasers but really lost count. I think if I didn't ride a Gas Gas, I would ride a Beta but team Sherco is very well organized and Ryan Young is the man.
Trials bikes all look the same upside down.
Hey! I grew up in Plano,never heard of George Nadle though.Must have left before the first Trials bike ever came to town
I got myself a 1993 Aprilia yesterday...
I guess, it must have been ridden by someone in the nineties
I was riding MX and enduro bikes in the 90's.
I did bring a 1992 Gas Gas GT250 home yesterday so I have a 90's trials bike now. Like Helikoptermann said somebody must have been riding it in the 90's...
Aaaand, since we´re already here...i have a quick question:
Is there a special trick to kickstarting those big(ger) 2smokers?
I tried to start my Aprilia today (0° Celsius), and it took me ages to get that sucker running. The guy I bought it from yesterday did it fairly quick (3-5 kicks).
So far, I only had experiences with some 50cc smokers. Those I could get started rather quickly.
You could try this for kicking "technique" :
Other tips for really cold/hard starting are:
1) Turn fuel on and lay bike over for 30 seconds or so. This insures carb is full.
2) Put bike in 4th or 5th, crack the throttle and roll the bike back and forth a couple of times. Be sure you hear/feel the piston cycle in the cylinder. Stop on a backwards roll so the piston is near TDC. This helps create vacuum to draw fuel into the cylinder before you start kicking.
If I do both of those, bikes start pretty easily for me.
Boy, you need to look at your starting/pilot circuit.
- one missed step though, like any 2T, is if it has sat for days/weeks and you didn't add any mixed fuel, give the bike a shake and bounce for a min to make sure its mixed up and not separated.
That early Aprilia is also a possible candidate for a flaky (ducati? ) ignition/stator.
My instructions were intended for a bike that has been sitting a long time, like over winter. Not everybody winterizes bikes properly. If you had to do that every time to start your bike i agree a rejet or top end rebuild would be in order.
Here's a link to more details: http://bayarearidersforum.com/forums/showpost.php?p=7926624&postcount=5
You can probably find '90s trials bikes for the same price or less than a '70s vintage. Caveat Emptor: If it isn't a GasGas or Montesa, parts availability may be an issue since the manufacturers are only required to maintain inventory for expired models for 10-years. The Beta US importer has changed 3 times, with each new importer not purchasing the inventory of the previous importer (Hopefully you don't own a Techno)
We ride current Gasser Pros but keep a GasGas JT35 as a spare bike. By the mid-90s Trials designs from GasGas (1993-2003 GT-T/JT/JTR/JTX/TXT), Scorpa (ST), Beta (1993-1999 Techno), Fantic (1995-1997 Section/1998 Casta), Yamaha (1992-1996 TY250Z), and Honda-Montesa (1997-2004 Cota 315R) incorporated the significant changes that differentiate a modern trials motorcycle from their ancestors:
1. Hydraulic Disc brakes
2. Hydraulic clutch
3. Case reed valve intake
4. Liquid cooled cylinders (although the GasGas GT25 also had engine case cooling for the first few months)
5. Tubeless Radial rear tires (lighter). Front tires are tube type.
6. Adjustable suspension (Upside-down forks were abandoned in the mid-90's)
Our 1995 GasGas design is very capable unless your techniques and skill require a current sub-150 lbs. machine. The 147 lbs. GasGas 2002 Pro set the new standard for the lightweight modern trials bike, and facilitated the current riding influence from bicycle ('Bici') trials, Street BMX, and Freestyle MX.
It's amazing what riders were capable of on the older machines:
Charles Coutard in 1977 on a Bultaco Sherpa (200 lbs. twin-shock) and in 1987 on a Yamaha TY250R (216 lbs.) with air-cooled engines, drum brakes, and damper-rod forks:
<iframe width="560" height="315" src="http://www.youtube.com/embed/s-3-9Xi5a_k" frameborder="0" allowfullscreen></iframe>
After Bultaco initially ceased operation in 1979 and finally in 1983; the 80's introduced monoshock designs from Merlin, Mecatecno, Garelli, Montesa, Fantic, JCM, Beta, Aprilia, Honda, Yamaha, Alfer and JP Trials. Ossa merged with Bultaco in 1979 and ceased manufacture in 1982.
<iframe width="420" height="315" src="http://www.youtube.com/embed/He7OW8YVdX0" frameborder="0" allowfullscreen></iframe>
Josep Paxau emerged from the Merlin acquisition by GasGas and designed the GasGas model in 1993 by Amos Bilbao that lured Jordi Tarres ('JT') away from Beta. This model (GT-T/JT/JTR/JTX/TXT) continued into 2003 eventually replaced by the GasGas Pro model seen today. Paxau moved on in 1996 to Sherco when owner Marc Tessier purchased the rights to Bultaco and launched Sherco in 1998, hence the controversial similarities between Sherco ST models and GasGas TXT models.
Here's a video of what Jason Finn was capable of on a 1995 GasGas JT25:
<iframe width="420" height="315" src="http://www.youtube.com/embed/1V_iovDuZ28" frameborder="0" allowfullscreen></iframe>
Honda continued with the 1981 acquisition of Montesa.
Yamaha ceased offering the 1991-1996 Yamaha TYZ and entered into a partnership with Scorpa to supply engines. Pre-1998 Scorpa's used Rotax motors similar to Aprilia. Scorpa eventually declared backruptcy in 2009 and was acquired by Sherco, hence current Scorpa's use Sherco motors.
Beta of Italy adopted the aluminium frame in the '90s. The frames are manufactured for both Beta and Montesa by Verlicchi. The 1994-1999 Techno model emerged from the TR32/33/34/35/Zero/Synth/Gara in the '90s with development by Dougie Lampkin.
Ossa re-emerged in 2010. JotaGas was formed in 2009 under the direction of Jordi Tarres. Xispa, launched in 2005, currently offers the XPA300 developed with David Cobos. Xispa won against Sherco in the 2010 French civil suit that Xispa was importing trials bikes selling at 30%-40% below French market norms.
Cottage Industry: Most components such as Morad (nee Akront) wheel rims, AJP brakes cylinders/calipers, Domino throttles, Marzocchi or Paioli forks, Ohlins/Olle/Sachs shocks, Braking or Galfer rotors and brake pads, Talon Hubs, Ordonez radiators, S3 2-stroke cylinders, Renthal/Hebo/Jitsie/S3/Tomaselli handlebars, Keihin (PWK 28mm) or Dell'Orto (PHBL 26mm) carburetors, Lionelli electrical controls/rectifiers, Comex radiator fans, and Kokusan stators are shared by the manufacturers. In fact trials footpegs (S3/Raptor/Jitsie) are universal fit. Verlicchi makes the aluminium frames for Montesa and Beta. Tires suppliers are Michelin, Dunlop, Pirelli as OEM with IRC or VeeRubber aftermarket.
Since Trials manufacturers are relatively small, and the market quite specialized; the modern trials bike built for the masses is, with the exception of fine-tuning, identical hardware to the motorcycles rode by the World Champions.
Here's a video on excess... the beast from the 90's.
<iframe width="420" height="315" src="http://www.youtube.com/embed/vIaS2WI66jc" frameborder="0" allowfullscreen></iframe>
Jim just had his `93 at the world round. It was seen at all sections as he let the FIM official course clerk ride it!
Glad you made it home safe, hope you and your Son had a great time.
It was awesome! I would recommend scoring at a world round for great entertainment and self satisfaction for a bucket list! Sign me up for the next one!!!
I wouldn't normally consider even thinking about posting a commercial in here... but it fits. https://www.youtube.com/watch?v=GP6XG-s32y8&feature=youtube_gdata_player
Might explain No Stop thinking...
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