Which RS125 do I actually have?
How to read a VIN or a frame number, and how to tell the engine from the casting.
Coming soonIdentify your bikeVideos
- Ten films are planned. None is published yet.
- Each one points at a guide that does exist.
- The guides are the thing you can use today.
Coming soon
Ten films, none of them up yet.
The plan is one long video for each guide stage, cut into three or four short clips of the key step. Every video will link to its guide and to the parts list. None of these films is published yet.
Rotax 122 vs 123
Tell the two engines apart. Parts do not swap between them.
Coming soonEngine ID guideThe RS125 generations, 1993 to 2006
A walk through the four generations in this record.
Coming soonGenerationsImporting an Italian RS125
NOVA, the V55/5, and the exemption from type approval once a bike is over 10 years old.
Coming soonImport guideRestoration episode 1: strip-down
Labelling, photographs, bagging, a condition report, and the crash-damage checks.
Coming soonGuide 1The RAVE powervalve
Remove it, clean it, test the solenoid, and set the blade the way the brief describes.
Coming soonRAVE guideTop end: piston, rings and barrel
What to measure: piston codes, ring gaps and the wear limits from Haynes 4298.
Coming soonTop-end guideCarb strip and jetting basics
VHSB 34 against PHBH 28, and the PHBH28BD jet stacks from Haynes 4298.
Coming soonCarb guideRestricted or full power?
How to look for a blanking plate, and what is legal on L-plates in the UK.
Coming soonUK lawTen checks before you buy a used RS125
The buying checklist: engine identity, restriction, corrosion, clocks and paperwork.
Coming soonBuying guide