ESE's works engine tuner

[wobbly]

The instant you make the case vol bigger the jetting goes richer, and visa versa.
If you had a egt trace on the screen I would bet the runs with the spacer were lower egt, that is what has moved the peak Hp point.

In a Rotax 257 single designed for road racing, I filled the crank holes and machined the reed box off 10mm.
This was to use it on a kart sprint track, the jetting was 10 sizes different for the same 1250* egt, no other changes.

[ief]

Something seems amiss here... contradicting posts.

higher egt = peak higher up the rev range right?

edit: wrong then?

[wobbly]

The blue run is reed only,then with the spacer fitted the green run is to the left = lower egt from bigger case.

[rgvbaz]

The blue run is reed only,then with the spacer fitted the green run is to the left = lower egt from bigger case.

Wayne, other way around. Spacer gave the higher peak RPM.

Dave

[rgvbaz]

Increasing the crankcase volume has several consequences. One of those is that the flow through the carb will be more even, less violent, which usually results in a leaner mixture. Looking at your curves that would seem to be the most probable explanation. Did you fiddle with the jetting as well as with the spacer?

Yes, obvious now you say it Frits, but I never would have thought about that!

No I didn't play with the jetting I realise now I should have!

Dave

[rgvbaz]

Wouldn't also your spacer also as well as increasing the volume make the track longer also......................
In fact it throws up a huge amount of variables shape of tract shrouding of reeds etc. Aren't two strokes a cruel mistress

Yes, they are female!

[wobbly]

Yes and I am a dumb shit - the spacer raised the rpm, so the bigger case gave more rpm but no more power.
If the egt had been tracked then a rejet may have cranked out some more power as well.
Must be loosing it, sorry.

[richban]

Yes and I am a dumb shit - the spacer raised the rpm, so the bigger case gave more rpm but no more power.
If the egt had been tracked then a rejet may have cranked out some more power as well.
Must be loosing it, sorry.

Well I must say you got it right with the 400. Was at manfield yesterday and man that thing is cool. It was flying at the end of the day. Smelt good sounded amazing and went like a f*cken rocket all day. Lots of people wanting one at the end of the day. Me included. weapon. I might have some video but I think I forgot to turn on the sound. bugger.

[wobbly]

Andy rang me and asked about a few jetting changes, sounds to have worked OK.
He seems to like " hanging on for grim death " in a straight line, as he calls it, but now it wheelstands off every turn.
Fuck I wish I could ride it, maybe bolt me on the back one day, like they did with the BSL500, and did 280 clicks at Puke to see if my daks turned brown.
My face was white and my knuckles were blue, but the seat was still green, just.

[richban]

Andy rang me and asked about a few jetting changes, sounds to have worked OK.
He seems to like " hanging on for grim death " in a straight line, as he calls it, but now it wheelstands off every turn.
Fuck I wish I could ride it, maybe bolt me on the back one day, like they did with the BSL500, and did 280 clicks at Puke to see if my daks turned brown.
My face was white and my knuckles were blue, but the seat was still green, just.

Yeah he mentioned wanting to smooth out the bottom. You could tell when he sorted it. Like you say wheel to the sky out of the turns. Top end speed looked insane. Even compared to the 1L bikes around it. Not sure I would get on the back.

[2T Institute]

Andy rang me and asked about a few jetting changes, sounds to have worked OK.
He seems to like " hanging on for grim death " in a straight line, as he calls it, but now it wheelstands off every turn.
Fuck I wish I could ride it, maybe bolt me on the back one day, like they did with the BSL500, and did 280 clicks at Puke to see if my daks turned brown.
My face was white and my knuckles were blue, but the seat was still green, just.

Why not just bolt 4 roller blades on to the chair and tie a ski rope onto the grab rail? just make sure the rider doesn't put you into a whip though

[Bert]

Well I must say you got it right with the 400. Was at manfield yesterday and man that thing is cool. It was flying at the end of the day. Smelt good sounded amazing and went like a f*cken rocket all day. Lots of people wanting one at the end of the day. Me included. weapon. I might have some video but I think I forgot to turn on the sound. bugger.

Andy rang me and asked about a few jetting changes, sounds to have worked OK.
He seems to like " hanging on for grim death " in a straight line, as he calls it, but now it wheelstands off every turn.
Fuck I wish I could ride it, maybe bolt me on the back one day, like they did with the BSL500, and did 280 clicks at Puke to see if my daks turned brown.
My face was white and my knuckles were blue, but the seat was still green, just.

I take my hat off to you Sir Wobs. As rich said it looked & sounded f##ken amazing yesterday. When I saw the bricky he had the biggest grin (was excited as a 16 year old boy in a strip bar)...

[husaberg]

1995 nx4.........

[husaberg]

2003 NX4
I will follow up with a litle something else once i convince my camera to talk to my computer

These are off Ebay .In pic three you can see the strp in the EX although not so clear because of carbon

[wobbly]

Yea well Lozza, why the fuck do you think im a wheelchair, doin exactly that shit is exactly why.
But yes it is cool when others appreciate the effort and sweat that went into the 400.
The Bricky paid good money - he has already had a heap of fun on it, what more could a guy ask for from a toy.
His wife says is the best thing that has happened to him , apart from the kids, and they are debating that now.