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tuning, riding & racing the pamp
The 280: a brief report
Out of the blue in 2003 I
got a call from Gas Gas UK "we've got a one off 280 here do you want
it?" Only one answer & the deal was done.
These were not imported
officially into UK due to carb issues. But mine had the Keihin fitted
straight off with 45/125 jetting and runs superbly. Boyesen reeds were
fitted as I feel these give the smoothest engine characteristics.
Gearing : 11/41 for LDTs & 10/41 for proper trials. Used non oring
chains for less drag (but more running costs...). Trials bars, sump
plate & rear set foot peg brackets complete the spec.
Its been ridden in
countless LDTs, a few Sammy Miller rounds, the Bluebeards &
Greybeards trials and last year (2005) I rode some AMCA Group &
Club trials, whilst waiting for a new Beta trials bike to arrive. Its
been totally reliable - only using the typical service items - tyres,
chains, pads etc. And very soon its having its first MOT......
I often think about
getting a Pre-65 Trials bike to ride LDTs etc - but then when would I
ride the Pamp? These thoughts soon pass when I recall what fun
these Pamperas are. Its a real shame they've been outlawed by the
A Pamp in Wales : Welsh
Original text from 2001...
Prep & Tuning the
After six months of enforced inactivity (F & M) I fancied a change
of steed - so out went the DRZ400E & in came a super lightweight
Gas Pampera 250.
Why choose a Pampera? Well there is no dispute that lightweight is a good thing when riding off road. The Pamp comes in at circa 90 kg. Its nice and low which is a good thing for shorties. It could be a laugh to ride enduros on a small, light bike, sort of underdog idea. And, of course, I sell them, so a bit of promotion would do no harm!
My first task was to prep
mainly competition use. There are a few drawbacks associated with the
retail price of this trail/fun bike. Non O-ring chain, cheaper rims
steel handlebars. So I've fitted security bolts (tyre clamps) one in
front & two in the rear wheel. Added an o-ring chain after the
outing. Also Renthal bars & Acerbis handguards.
Stock jetting: Main 122,
Needle D36 clip 2 grooves from top.
I have just fitted
Reeds. The reeds made a big difference - pulls much better throughout
rev range. Next I'll try a Keihin PWK28 carb. I've used these on the
Gassers with good results. BTW the aim of my tuning is to get "more of
the same" and not alter the power characteristics too much. I like the
linear power - good for grip & makes life easy when you get
The last thing I want is to turn it into a gutless revbox.
Have now (18/11) fitted the Keihin PWK28 carb - it fits with a few minor mods. As expected it gives smooth clean running from idle to WOT and the best bit is that every small adjustment makes a difference. Much better than the std wooley Delorto. It will pull cleanly at part throttle on the road, no two stroke stuttering and almost no popping on the over-run. Seems to make the bike smoother, but I doubt it increases the power much. Faster pick up and a lighter throttle pull. The Keihin came fitted with slightly bigger jets than I used in the Trials bikes and I doubt I'll change them as it runs so well. A mod for the perfectionist trials rider, possibly. Keihin jetting: 45 pilot, 125 main, needle clip in middle groove.
Not too sure of tank size/range (I measured it at - about 7 - 7.5 litres). Recently it went from Butser Hill to Midhurst via the South Downs Way on reserve and then took only 5.5 litres. So reserve arrives early.
I used several
on the events entered.
Fitted a rear Duro MX
for the Tidworth event & a later trail ride.
( Of course, I'm happy to supply and/or fit any of the above)
Heres one they made
Camozzi GLC bike: Could this be the inspiration for the Mk3
Bruno Camozzi (French Trials Ace & works Gas Gas rider) rode a
modified Mark 2 Pampera in the Gilles Lalay Enduro (known as the
toughest event) and finished 11th. Scans from the French magazine Moto
Crampons (big files though) Camozzi
This was right up the Pampera's street - soft power gives huge grip. I was running an MT43 Pirelli trials on the rear at 4 psi - thats why you need two security bolts - and thats why it held its grip. It was a doddle to ride in such wet conditions, most of the time just using a steady throttle and just giving it a burst of power to bite through the slime now & then. I could see there is scope to trim the lock stops back to gain a better turning circle - but nothing encountered on the Witley LDT was that tight. We rode from home to this event and the bike kept up 50-60 mph and returned about 50 mpg too. Result : 4th place
Warsop Trophy S.E.
It made it to Midhurst after riding most of the South Downs Way in the dark, oh what fun. The Pampera's headlight was sort of okay off road but next door to useless in the bright halogen world of modern traffic. 25 measly watts! I've now fitted a 45 watt bulb and its a big improvement.
Winston Grove Downland
So how did the Pamp make out - well only three times did I run out of steering lock, but three or four times I wanted that newer tyre. The bike sumped out a couple of times too, but I blame the nut on top of the saddle for that! There is scope to get more steering lock easily. The gearing was okay - first did for all sections. If you were keen on using the Pamp for more trials, lower gearing would give a better choice of gears, at the expense of top gear cruising speed. Trim those steering stops and fit trials bars. I was still running enduro bars & handguards. The soft suspension works well on trials hazards. Festering in the corner of my garage is a Tiger Cub trials which I've not used for four years or so. I found the prep and maintenace too time consuming and even then you were not guaranteed a fault free day. The Pamp makes a good alternative to ride this series - good fuel range, comfy, handy enough in the sections & very civilised running with the new carb fitted. It would give a very easy ride on the sidecar route and copes well with most of the hard route sections. Assuming the rest of the series event are of a similar standard, I'm keen to try more next year. Result: 5th in class
Some conclusions: The Pampera will do service as a handy enduro mount for the discerning Clubman or Sportsman class rider. It can be made into a half decent trials bike easily & a competent rider could ride normal club trials (easy route) with some sucess. I hope to ride mine in the Greybeards trial next year. For Long Distance trials its so good its like cheating! And of course it is an excellent trail bike & easy to ride for all levels of rider.
Thats enough event reports for now, so I will only update this page when new technical info or mods come to light. Or the bike gets put through a particularly tough event. The intention is to ride more Enduros in 2002 & probably a few Long Distance Trials too.