tcrhino

Yoe are correct: the switch on the backside the mask should be the light switch. It is a bit fiddly to use; do you press it properly?

What might help; the cylinder head cover has a brass bolt to release trapped air.

My dealer -and Vertigo importer for The Netherlands- (Nonstopmotoren.com) sourced the part from S3. Dealer did the installation and I watched how it was done. Installation was a bit fiddly because the fan housing is blocking one of the head bolts. Easiest would be to remove the radiator and fan (water is out anyway), but the mechanic managed to do it by only removing the fan. Using new o-rings is important as is applying the correct torque to the head bolts. With a bit of patience and the proper tools it's possible to do yourself.

It was fitted to a 2017 Ice Hell 250

There is an option to plan a short holiday from June 22 till June 30 and watch TWO TrialGP's, first one in the Netherlands and in the next in Belgium. Both locations are 170 miles apart...

To me that makes sense (no expert as well). Same throttle position (closed) and same fuel injection (no other map), but increased idle means more efficient use of the available air/fuel mixture...

According to the dealer remapping of the ECU wasn't required. It does run really great with the high compression insert. BTW: the higher idle doesn't bother me at all.

Last week I had a high compression cylinder head insert installed on my 250 (S3 insert). Compared it with a standard 250 of the same year (at the dealer's) and it feels much stronger and runs cleaner. So very happy with the result. The high compression is noticeable when starting, but it still starts with the first kick warm, three when cold. Strange thing is that the idle went up. Stalling it now is almost impossible, but clutch control needs some adaption. Any thoughts how idle can increase by a high compression insert?

Not that difficult. The rocker arm needs to be removed and of course the top shock bolt (under the ECU). Removing both triangles (left and right) makes it all a bit easier. Last time reassembling I mounted the triangles with the swingarm sleeves and bolts, but without the swingarm, to line-out the bolts for the swingarm (does that make sense?) By doing so it makes fitting the swingarm sleeves and bolts a lot less fiddly.

Checking makes good sense after every few rides. Regarding suspension: had my rear shock serviced a few weeks ago by Reiger. Slightly heavier spring (78 kilo) and other shims makes the bike a bit more nimble. (In case you are wondering: I forgot to note the specs of the new spring..)

Would be great if Vertigo would offer the possibility to configure your own bike. Things like bars, forks, wheels, exhaust (Ti/Steel), triple clamps all have same fit and are mostly inter-changeable (with limited choices of course). Similar with the configuration of a car.

That's interesting... Ik know that the dog-bone is different on recent models, but I didn't know that engine characteristics are that different. @Telecat: do you know what is altered? Different mapping only or changes to exhaust, butterfly and reeds as well. Regarding butterfly: my last Ossa had a 15 degree butterfly, that made throttle response more direct ('more snappy').

Yep, that's the shift shaft seal leaking...

Did you check the primary shaft cover? Sealing area of the cover to crankcase is tiny.

Based on...?

Ask the dealer how to start it! Mine starts cold with two or three kicks; first kick throttle wide open. Warm engine almost always on the first kick.

Mine started weeping two weeks ago (first issue with the Vertigo). The advice above was spot on: the primary shaft cover was the culprit. Removed and cleaned the parts and reassembled with some Hylomar blue. Still good after three rides.

Like jonnyc21 said: ride as many as you can. I used my Vertigo every weekend during the last year and didn't have any problems. And no need to clean carbs...

Bought a new bike, but... the Ossa I had is still on its original front wheel bearings. Some weeks ago during practice I met the guy that bought my Ossa. Told him what I modified / added to the bike. The nilos rings were still in place and the bearings felt good (of course we didn't check the bearings...).

Could it be that Stefan Pierer convinced Joan Gurt to sell Ossa...? KTM has the knowledge and money to improve the Ossa and make it orange.

Agreed on the visibility of the fuel level. And the left triangle protector can be opened fairly easy with a Dremel.

Had a look at the carbon... Seems useless to cover the exhaust protectors. and why cover the tank? In that way it will be more difficult to keep an eye on the fuel level. Flywheel and clutch covers look good though.

In the original setup the breather sits low in the air box under the filter. Re-rout it to a higher point in the air box could be an easy fix (assuming that the breather causes the milky oil...)

No, they don't. I have S3 pegs on mine and occasionally the kickstarter catches the peg. What does help is to stop the kick earlier. On an Ossa the kickstarter damages the footrest mount (which I didn't like...). I learned to kick hard at the start of the stroke and stop before hitting the mount. Same technique on the Vertigo prevents catching the peg.

Yep, there is a nut, sort of... The crankcase has threaded sleeves on both sides. That's were the bolt should go (through the aluminum triangle that holds the suspension rocker). If you have the parts book (available on Vertigo site): page 17, part number 15. Could be that the sleeve was forced out the crankcase by the loose bolt?