ESE's works engine tuner

**Moooools** · 18th August 2011, 20:31

Sorry to hijack thread with smelly four stroke jibber jabber, but you two stroke fanatics wouldn't happen to know of a 30ish mm carb with a really significant (60degree) downdraft angle would you?
I was thinking Rgv 250 vj21 or something similar.
Anyone got info or even a carb to sell me?

**koba** · 18th August 2011, 22:01

Originally Posted by Moooools

Sorry to hijack thread with smelly four stroke jibber jabber, but you two stroke fanatics wouldn't happen to know of a 30ish mm carb with a really significant (60degree) downdraft angle would you?
I was thinking Rgv 250 vj21 or something similar.
Anyone got info or even a carb to sell me?

VT250?
Or is that what it's for?

**Moooools** · 18th August 2011, 22:04

that is indeed what it is for. But that is a valid option...

Was looking to get away from a cv carb. I have a cbr250 carb wh ich should work, but still a cv.

**koba** · 18th August 2011, 22:08

Originally Posted by Moooools

that is indeed what it is for. But that is a valid option...

Was looking to get away from a cv carb. I have a cbr250 carb wh ich should work, but still a cv.

Get it running on the standard one first.

**husaberg** · 18th August 2011, 22:11

Originally Posted by Moooools

Sorry to hijack thread with smelly four stroke jibber jabber, but you two stroke fanatics wouldn't happen to know of a 30ish mm carb with a really significant (60degree) downdraft angle would you?
I was thinking Rgv 250 vj21 or something similar.
Anyone got info or even a carb to sell me?

My tractor (TEA ferguson petrol) has a old solex or maybe zenith of around 30mm with a 90 degree downdraft.It shouldn't even need rejetting as its 28hp
60 degrees, The only ones I have seen that would be past 45 degrees is an amal GP or TT 1 5/32 or ss dellotto look at a Aermacchi or Manx Norton 40m or similar

There are plenty of cv downdrafts 45 degress off fzr400 or similar. The 3ln 250 is 28mm I think.The cbr250r are 30mm odd.
The crf150r has the fCR around 30mm. Have a look at the Sudco site they might be cheaper than you think,with the US economy and dollar.

The nsr250 have one of a similar size depending on model. the rgvs are 32 or 34mm TZR250 the first one is 28mm downdraft.
I hope that helps, but you honestly would probably find it far less frustrating to stick with a 4 stroke carb.
A hyosung has a 28mm ish downdraft much similar to a fzr250 and some old Yamaha twins cruiser types had some pretty big angle downdrafts of similar size to what you want some have acelerator pump and all.

**Moooools** · 18th August 2011, 22:14

I don't have one. But yes that does make sense.
I figured if I couldn't find one a non cv carb would be much easier to set up.

Right. Back to two strokes.

How about that burning oil aye?

**koba** · 18th August 2011, 22:28

Originally Posted by Moooools

I don't have one. But yes that does make sense.
I figured if I couldn't find one a non cv carb would be much easier to set up.

Right. Back to two strokes.

How about that burning oil aye?

Hit Ivan up if you want a VT 250 carb, I gave him a whole bike a while ago and he was meant to give me the carbs back when he had stripped it down.

**quallman1234** · 19th August 2011, 08:28

Will anything come of this?

http://twostrokemotocross.com/2009/0...s-strike-back/

**kel** · 19th August 2011, 12:41

Originally Posted by husaberg

Cagiva had ran at rear facing disk valve on a modified Yamaha tz500/4 crankcase ala the modern RSA engine in 1981 .Also the 1984 rotary valve v4 YZR500 ran the same thing.

MZ used this design in the 60's, attached image is a horizontal single with rear disk induction complete with down draft carb.

Click image for larger version.

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**F5 Dave** · 19th August 2011, 15:16

you can just imagine that thing smashing through your roof in the 40s & being the last thing you see before blowing you to smithereens

**Gigglebutton** · 19th August 2011, 15:44

Originally Posted by Moooools

Sorry to hijack thread with smelly four stroke jibber jabber, but you two stroke fanatics wouldn't happen to know of a 30ish mm carb with a really significant (60degree) downdraft angle would you?
I was thinking Rgv 250 vj21 or something similar.
Anyone got info or even a carb to sell me?

I have a pair of 32mm Keihin flat slides off an NSR. They have a shed load of plumbing and electrix attached

**husaberg** · 19th August 2011, 16:47

Originally Posted by kel

MZ used this design in the 60's, attached image is a horizontal single with rear disk induction complete with down draft carb.

Now thats a Radial finned Head.
I was looking at what I initally though was a distributor, but it is a float chamber for the carb to the right.on the MZ engine.
Interestingly esp the finning looks like the forward cylinder of the DKW Three below. The AJS Porcupine had spiked fins hense the name.
If you were to start from scratch with a decent 6 speed box the lay down engine could be interesting afterall the Aermachi ,experimental laydown Norton and supermono Duke vertical engines were renowned for there handling.not so sure about the 90 degree drive on the MZ top mount rotary valve though.thrown in an couple of pics of horozontal engines as well.Sorry about they are all diesels.

For Moooools if his heart is set on the 2 stroke carb http://www.trademe.co.nz/a.aspx?id=400725760
RGV 250 VJ22A MIKUNI CARBS FLAT SLIDE $100Attachment 245016