Motorcycles by Dr_C

Motorcycles by Dr_C Welcome to my technical motorcycle adventures!

This page is dedicated to motorcycles, engineering, manufacturing, roadracing and all other fun stuff related to that.

Sorry about the vacuum of lately! Apparently I have probably been cross-eyed since I was born, but an "experienced" brai...
05/08/2026

Sorry about the vacuum of lately! Apparently I have probably been cross-eyed since I was born, but an "experienced" brain has increasingly difficult to correct this. So, race pace will have to wait until this is fixed, and waiting time is looong. This is frustrating, to say the least.

In the meantime I got fed up listening to the howling noise from the race bus differential. Bought a lower mileage rear axle and refurbished it with wheel bearings, brake discs, hoses/lines and all caliper rubbers. Knocked rust away, put on rust stopper and painted the whole thing with 2K car paint. The beast weighs in on 140kg. Now ready to replace the noisy one! Not the billet story you hoped for, but a part of my technical motorcycle adventures!

02/07/2026

In the meantime in the very deep south of Sweden...

Ducati 888sp5, 1993, #472
Mine since 1994.

I'm still smiling when looking back at the trackday last week! 😁The bike was performing very well, and I had a blast! No...
22/06/2026

I'm still smiling when looking back at the trackday last week! 😁The bike was performing very well, and I had a blast! No fluids where they shouldn´t! The new fuel pump working OK, no other leaks and oil pressure was stable. Yes, there is still some speed to gain, but it is just a matter of training and correction of vision!😀Phew! It has taken me "some" years to get here, but thanks to all your cheering and support ❤🙏, the bike seems ready for real action!

Photos in courtesy of Tobias Grönberg.

The other kids are out playing at Våler Raceway this weekend. Due to some problems with my vision (only when on race pac...
14/06/2026

The other kids are out playing at Våler Raceway this weekend. Due to some problems with my vision (only when on race pace), I sadly had to sit this one out until the doctors have figured out what is going on! 🧐 I have a trackday though, coming up on Wednesday! Then I can test the improvements done since last race weekend, in a controlled environment (no race pace). New fuel pump, new oil pressure gauge and new voltage gauge.

You do not have much time checking out the cockpit, when you are going for it, but some info is necessary in the pits or if you are facing something technical on track. Oh, yes! I'm also relocating the mounting holes in the front mud guard to make better room for the heaters!

As always: Life is racing! The rest is just waiting! 🤣

Now that's more like it! 5A at 3,5bar fuel pressure! New pump fitting Yamaha R1/R6 arrived today for 55€ incl shipping. ...
08/06/2026

Now that's more like it! 5A at 3,5bar fuel pressure! New pump fitting Yamaha R1/R6 arrived today for 55€ incl shipping. OEM was 900€ and 5 weeks delivery! 🤯

I borrowed a gas welder kit from a guy in the pits and got the exhaust muffler welded! Packed the muffler and riveted it...
02/06/2026

I borrowed a gas welder kit from a guy in the pits and got the exhaust muffler welded! Packed the muffler and riveted it back together, good as new! Found the source of a small oil leak. It was actually the pressure gauge itself that was leaking! Removed the gauge and temporarily plugged the impulse line, fixed the problem.

I took a bicycle tour around the track with Kristian Salö, who generously shared his tips and tricks getting around this heavily ondulated track!

The Sunday warm-up was wet, but now I actually recognised the turns (!). Still awfully slow, but not lost. The bike was running cold in the rain, not exceeding the EFI cold start sequence (60degC). Running rich and jerky, when rolling on throttle, is not doing you any favours in wet conditions. Still problem with my vision from time to time. The bike was otherwise running very well, with both oil and water where they should!

The start of race 2 went, and I was on it for 2-3 gears, when the engine died! No noise or seizure, just... dead. Rolled off and sighed. Packed up and drove 1000km back home again. Counted the tunnels we passed and ended at 69! Building roads in Norway can't be a cheap affair!

Back home I packed up and did some RCA. The 15A fuse for the fuel pump had blown! Checked the current while running and it was close to 13A! That's not a healthy pump, even if it is over-dimensioned! Now I'm looking for a Yamaha R6 pump, which looks like a suitable size for this engine power. It is small and efficient!

All in all, despite very poor results, the initial problems were solved, I got some track time and the opportunity to try out the challenging Sokndal track!

30/05/2026

The engine is performing well! 🎉 The first silencer, not so much. 💩 Problem with my contact lenses not staying in place, despite eye-drops, makes it hard to push on!

29/05/2026

Now going racing! Will it work?

28/05/2026

Just truck'n!

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Harlösa

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