lsv

Unusual to have such a narrow rim on the rear I would have thought, but the caliper doesn't lie. I would think that you will need two at 1.60" or WM1...............

Rim info FYI. Rim lock needs to be suitable for size of rim and 21" rims are not always the same WM number - I know that from experience Hondas have used both 1.6 and 1.85 (WM1 and 2) on trials bikes. rims.pdf

I would say Cu washer between union and master cyl.

wire wheel on a bench grinder works fine.

Best sticking with manufacturers spec IMHO. Changing ratio can affect carburation (Fuel/air ratio)

Cabby, It seems to be more common these days with the **** quality fuel we have to use. Hope you just cleared with airline and wasn't tempted to bodge a bit of wire down it! Seen too many pilot jets been ruined by "jet cleaning" tools that are too large for the size of jet..............

pilot jet blocked?

Gas Gas seem to have a penchant for cracking frames IMHO......................

We were riding in Wales before the "fuel shortage" and could only get E10 at two different fuel stations............................

Best to avoid E10 if at all possible IMHO. I wouldn't use it in my lawnmower..............

I use these for greenlaning, (with removable knee pads)be ok for trials as well IMHO. https://www.rst-moto.com/rst-denim-cargo-jean-reinforced-with-aramid-fibers-1485.html I just wear gortex leggings on top if it's wet.

Britool 3151 1.1/4" - 3" (approx 32mm - 75mm)

Just try an adjustable one or see if Beta list one as a special tool. PS I have a spare Britool 3151 availible if any use to you................

Very helpful comment that. JustinC The swinging arm bearings seldom give trouble and need changing in my experience. However the bearings in the arm where the link plates attach are (same as dogbone) very often in need of changing. If neglected can lead to the lug being ripped from the arm. If changing in-situ it is easier if you make a long stepped drift (easily turned on a lathe) to drive them out and new ones in. Hope this helps

Why not just contact Dave Cooper and ask the question?................................

Falcons and NJBs are both great - Rockshocks just bling IMHO.................

Contact Paul at Sids Wheels, he'll sort it for you. Top notch wheel builder................

I think you need to have a look on ebay for a crystal ball...................

Woody, mine is a 2019 but I don't think there is many (if any) differences between them. And I wouldn't bother with the gear lever kit really as you don't have to change gear that much with such a wide torque band (and I am used to trials bikes ? ) The S3 air box mod is useful though as is putting a different lid on the air filter. (17212-NN4-G10)

90 miles???? You'll be lucky! I get about 40-50miles max, so need to keep that in mind and carry some extra fuel and plan the fuel stops on the route. Other than that, they are a great bike. I use 10-38 gearing on mine and although it will do more, usually keep to 50mph max on A roads. (Although we try and avoid main roads and keep to the small lanes between the green ones.) Easy to fit 2 Liters under seat if needed.

Swinging arms on 4RT seem to be same (at least up to2017) on all models -except for colour/finish. Also interchangable with late model 315 arms.

I think you will find that the number on the jet refers to its diameter in hundredths of a millimeter. eg. a number 38 is 0.38mm. This I believe is a standard that has been used since Adam was a lad. But, I stand to be corrected.....................

Just drill a small hole in the end of the lever and put a small cable tie through it. problem solved!

It's a pity that Dunlop don't make the proper old style trials wellys anymore, thick rubber with good penetration protection,steel midsole and toe-cap and 100% waterproof ! What more could you ask for? (Bit cold though in winter ? )

Ref. rear reflectors. From the MOT testers manual :- Rear reflectors are not needed on motorcycles that: do not have front and rear position lamps fitted have such lamps permanently disconnected, painted over or masked