ESE's works engine tuner

[speedpro]

Or use a pumper carb

[F5 Dave]

Well I sidestepped the shock problem with the Case reed conversion (as long as the carb isn't too tall). Only problem is you need a smaller carb than the KX & ideally downdraft like the RGV Mikuni. FCRs are huoooge 'case they don't care about minimising the area under the carb on a foul stroke.

[bungbung]

http://www.youtube.com/watch?v=QgMgV3eDDvA

12 sec quarter. I wonder what the combined rider/bike weight is?

[Drew]

RGV Mikuni.

You want one? I've got a couple here.

[F5 Dave]

Actually, ahh heck PM sent.

Pity MC28s weren't proper solenoid carbs cause they were downdraft (32s). not sure how physically big they are either.

[husaberg]

\ but I wish they would start again as there is no way this KX carb is going into the RS frame without a fairly major cut & shut.

Problem is the case reed conversion is too low so I'd need to run the PWK at a 40 degree angle which ain't going to happen, or accept a bit of a bend & some unwanted length as a compromise but at least get the PWK carb cw solenoid. . . except the frame needs a rethink. It could almost work if I assembled it & fit the engine to the frame. . .but that means dropping the engine for a jet change & even I think that's unworkable.

So now I'm stuck with the poxy RGV carb & trying to think how to make an external Solenoid PJ conversion. \

That shock mount crossmember is a problem for sure. I have looked at all sorts of options like cutting it out and moving the shock to the side and even rotating the engine and mounting it forward with the cylinder near vertical, possibly with a jackshaft. Moving the engine forward needs more investigation though I see problems with chain geometry and possibly clearance to the front wheel

Kel and Bren already sidestepped the issue.
Now You to are scaring me..its bad enough me head won't fit.

[F5 Dave]

its an issue. With your taller reed position you will have better options. Nigels RG150 engine/carb fits in ok, or so it seems, he had to do a bit to make the engine itself squeeze in.

[husaberg]

its an issue. With your taller reed position you will have better options. Nigels RG150 engine/carb fits in ok, or so it seems, he had to do a bit to make the engine itself squeeze in.

I have got both here courtesy of TZ, i will post a pic of both side by slide. the KX has a venturi inserted for 24mm throat.
I think the rear mount of the NSR engine will prevent a short short straight intake without a remote float anyway.

[TZ350]

The F9 is losing it's EFI, a backwards step. Seems it's not in the "spirit of the era" if I want to keep racing it in VMX.

Sorry to hear you have run foul of the Luddites ... and have to remove the EFI.

But many thanks for showing that good home brew EFI is possible on a 2T, some of the posts and video of your dyno runs.

Attachment 284277Attachment 284278

EFI YZ250, (the graph is in mph because I could not easily get an ignition timing signal for rpm, next time).

Attachment 284276Attachment 284279

EFI Kawasaki F86M 350 Big Horn from the 70's.

Attachment 284275

Yamaha blue line, Kawasaki red.

Here is ball valve and EFI at work. Interesting how the variable rotary valve housing needed to be controlled differently to get rid of the unwanted torque dip around 4 to 5 thousand. Thanks to Rob for sorting this out, I thought I knew a bit about rotary valve engines but after this run at ESE under Robs guidance, I am definitely the apprentice.

[Frits Overmars]

Did you consider the giant air bubble in the cooling system above the red line?

[husaberg]

Did you consider the giant air bubble in the cooling system above the red line?

Yip after you said about it. It has a NSR250 front head on it at the moment. The NSR125 one Lozza sent over likely wont fit the NSR250 cylinder.
(Thanks Bren for checking that for me after i told him to buy one cause it would)

But i plan on using this one anyway.

But it is the talking about it stage... i need a engine to be ferried down here.............
Before anything can be nailed down.....

[TZ350]

This PJ stuff is all becoming a moot point atm. as there is no way this KX carb is going into the RS frame without a fairly major cut & shut.

So now I'm stuck with the poxy RGV carb & trying to think how to make an external Solenoid PJ conversion.

use a pumper carb

Team ESE have two 50's running pumpers.

Rick had the same sort of room issues with his TF125/RS but now uses a pumper. He took the last four wins at Mt Wellington using a 24mm Tillotson HL360A.

The 50's run the same Tillotson and 6lb pop off, my 125 was 9lb and I am unsure what Ricks is but probably around 9 too.



With a solenoid from Jaycar an adjustable jet and some cleverness you could fit an electric power jet to it too.

[F5 Dave]

That first picture with carb on engine would make me concerned Husi. I think you are not going to have space.

MC28 looks good. Or is it MC21?

[F5 Dave]

The 100 is wc so want to run decent size as allows.

[TZ350]

Pumpers come in bigger sizes, much bigger sizes.