Misfiring. Anyone got any ideas?

I've just spent three hours and a 250-mile round trip trying to sort a misfire on my Wood Rotax racer. I went to see fellow racer, Anthony Brown of Co-Built, who had a full Rotax electrical system that he assures me was all good. We changed every component individually and methodically.
Coil, ignitor box, stator, pick, plug, HT cap... We disconnected the killswitch. We checked the carb and rubber. It misfires badly at half to full throttle. It starts and ticks over beautifully.
On the way home I thought it might be a kinked fuel line, but the plug is sooty black - which I think points to lots of fuel but a lack of spark. It also shoots the odd flame from the exhaust when it's misfiring which leads me to believe it's spark, not fuel. This bike has run well, it's not like I'e built it up and it's not set up.
The only thing we didn't change was the flywheel itself. We didn't check the valve clearances, but I adjusted them before my last
race and the problem occured the same both before and after that race.
Any ideas? Please... GI

Want...

Sideburn T-shirts

Street tracker rims/tyres for sale

From J-W. I think he's coming to England at the weekend to race at Stoke. The photo shows built up wheels, but he's canabalised them for the hubs, so it's rims, tyres, tubes, NOT wheels. Email him (not us) with offers (around 400 euro). jw@ Dutch-Brothers.com
Rear
4.24x18" Morad rim Black, 40 holes
160-60 18" Michelin Pilot & tube
Front
3.5x18" Morad rim Black, 40 holes
120-70 18" Michelin Pilot & tube
purchased everything new for now abandoned street tracker project

Phil Little Racing Street Tracker kit

We were sent this press release.

'Some of you may be familiar with the Omar Yamaha 650 conversion kit I pioneered in 1988. As Phil Little Racing.com, I now have a new conversion kit for Sportsters. I have attached photos for your inspection. If you have problems opening the attached just go the website. The SXR Street TrackerTM is now posted on my website with a price list. Have a look. And call with any questions-952-935-8833
Thanks
Phil Little'
Phil Little Racing

TOYO'

Wood doesn't rust.

Dented in almost every body-panel my HiLux was an MOT failure hand-me-down free gift from Sean Bones Bryant when he up-graded to a pimp class Ford F-150 FX2 Sport.
It's lights have packed up on both the motorway and driving the back lanes in the pitch black. Had a high-speed blow-out fully loaded (plus trailer). Performed a life threatening oversteer skid in the wet (hence the fitting of dual concrete breezeblock ABS in winter months when it's not got other ballast). Had a mysterious flat battery at the most inopportune moments. But it's performed three emigrations in ten months like a faithful Sherpa, and become one of the family.
And I Love it more than a fluffy pet. BP

recommended tool kit includes Talisker Whiskey, Castrol R4, Gekkeikan sake, Wynn's carb cleaner, 3 in 1 oil, and a small blow-torch.

Burn Baby Burn

No idea what the Japanese text says or who the artists is, so here's a quote from Jack Kerouac...
The only people for me are the mad ones,
The ones who are mad to live,mad to talk,
mad to be saved, desirous of everything at
the same time, the ones who never yawn or
say a commonplace thing, but burn, burn,
burn, like a fabulous yellow Roman candles
exploding like spiders across the stars...
Amen
BP

Stoke next Sunday

Good amateur videos of the finals at Buxton can be seen at Paul's Speed Therapy blog.
He took this shot. I like it, because it shows I was going in deep on the brake (13, the only one crossed up). And that means I was trying. Though Richard May (9) was really trying. In the Thunderbike final he crashed and still came through to fifth (I'm pretty sure this shot isn't the final). GI

Spotted in Tokyo

Ben Wilson has sent a couple of mails lately, one is a bunch of shot he took in Tokyo, the other is a request someone might be able to help with.

'HELLO BOYS HOPE YOU'RE WELL.
JUST A QUICK ONE, MY LODGER IS MAKING A BRAT STYLE BIKE BASED ON AN XS400. IT HAS 18 MAG WHEEL UP FRONT AND A 16 AT THE REAR. HE WANTS A 18 FOR THE REAR WHICH YOU CAN GET OFF OF AN SR500. JUST WOUNDERED IF YOU MIGHT KNOW OF ANYONE WHO MIGHT HAVE ONE. WE HAVE BEEN LOOKING AND CAN'T SEEM TO FIND I SUSPECT YOUR MAG HAS INSPIRED A FEW PEOPLE TO PINCH THEM FOR THER XS650 Etc.
ANY NEWS WOULD BE GOOD NEWS
NICE ONE, BEN'

Crazy bar clamps

I picked this up over at Poppa Wheelie. And I'd have never noticed the bars if he hadn't made a special point of it mentioning it, but look how far Coolbeth mounts his bars back. Interesting as I'd always been told that dirt trackers wanted their weight over the front. G

HWZN style

HWZN Bross