peterh

You can find lots of useful information at The HellTeam https://www.thehellteam.com/technical-support/gas-gas-parts-and-service-manuals a 2018 workshop manual and a 2020 manual should help. Expect it will be a standard Keihin jet setup for a 125: jjh needle, clip 3rd from top, 125 main, 52 idle with 1.25 to 1.5 turns out on air screw and then adjust as to needs.

The drain flap is a bit of rigid type of plastic, and it is not a tight seal ( a bit like a reed valve), so water usually flows out or seeps out. But caked on mud can make it seal closed. Best thing is to remove rear guard with the airbox and check your drain flap. Also, as in suggestion in your other post, it is wise to separate the airbox from the rear guard/fender and reseal as the factory needs to use a bit more sealant to stop ingress of mud and water flicked up from the rear wheel.

There is a drain flap at the bottom of the airbox, which can get caked up with mud etc and thus stops it draining. If you get a look at a parts diagram, it is part no 02014TR100.

Isn't it a compression type gasket between the exhaust header flange and the exhaust port? It doesn't fit over the exhaust pipe. I have also used some exhaust gasket sealer for added confidence of a seal.

No-Toil for me too. And because it is easy and clean to use, you will likely clean the air filter more often than putting the job off. Letting the filter soak in the cleaner mix overnight restores the filter to Original look.

I found a suitable size plastic top of a bottle, cut it off to a suitable length and used that to push up the bash plate hole and then undo the sump plug. Required the hole and plug to line up nicely though. Worked well to stop oil flow in that gap between engine and baseplate.

I did a few years back, but stopped using it for trials. Great 2-stroke smell 😀, no sticking of rings (the usual comment with castor based oils of old) but with a Flash Point of 214°C ( by memory) I got perhaps got too much oil spread in muffler. Most noticeable was a hard carbon layer in exhaust header that I hadn't had with other oils and haven't since and really hard carbon on piston dome. Maybe some circumstantial evidence but didn't seem to work for me. Oh, and the most important thing was that it didn't keep my feet up better or me to win more trials. My thoughts, best left to the high revving performance engines, not trials.

Domino make a throttle body with a variable opening using a screw to restrict full throttle. Splatshop have a picture of one. I have one for use when starting a new or tentative rider. Also here is a blog of a DIY modification https://thehellteam.blog/2018/10/30/making-a-restriction-for-the-domino-throttle/

65-70kg (summer-winter ☺), so yes, a bit of a light weight.

A bit late in my response, but maybe my thoughts may still be relevant. I have a 2018 TRS RR 125 and love it. I had previously had 125, 200 & 250s and love how nimble the TRS 125 feels. Sure, I had to adapt to using a little more revs and holding the throttle on that little bit longer when going up and over but riding the 125 really makes getting your riding technique as best as can be as can't rely on the throttle. I have fitted Boyesen Carbontech Reeds (CTT123) and ended up just leaving the jetting the same (we ride no more than 300m above sea level here in Western Australia) - I have fitted Boyesen reeds to all my most recent trials bikes (125, 200 and 250s) and I have found that they do seem to smooth the power and improve low down power and torque - but I am also a rider that is not a heavy twister of the throttle and prefer to plug away with control. To me, my TRS RR has sufficient torque and grunt and no problem using 2nd gear for much of my riding. I too would look forward to riding a 2021 TRS 125 and compare.

Nhuskys comments on ease of starting, feeling of lightness (less flywheel effect) and the importance of, and thus the improvement gained, in riding technique are spot on. I have a 2018 TRS RR 125 and have added Boyesen carbontech reeds and very happy with my TRS. Currently a slight issue with selector spring mechanism for 1st & neutral but the 2019 and above 125s have the new style gear selector mechanism enjoyed by the change in 2018 for the 250 and above bikes.

Certainly no oil filter. Keep up to date through www.jotagas.com and your local dealers https://jotagas.com/dealers?lang=en Enjoy - i have had 2014 and 2015 Jotagas - my preference was the 2014.

My 2018 TRS RR 125 (with Reiger shock) had no slop when new, and remains great after regreasing and re-torqueing when i serviced linkages etc. after 12 months. Much better than other bikes i have had (but have not had a 4RT).

Have a look at beta-uk https://www.beta-uk.com/index.php/all-bikes/previous-models/pre-trial/2008-models they have a link to keihin carb settings. A good place to start. Happy New Year.

Normal, if batteries are coming close to full charge, just before the green light on charger comes on to show full charge.