ESE's works engine tuner

[husaberg]

Yes, we got 500 rpm more!

Jan i seen this pic of the RSA250 today
The inlet seems a little longer than the RSW or RSV

[marsheng]

Yes you have.
The drawing shown by Jan in post #25655 showed an elder type RSW cylinder.

Thanks very much. Casting a new barrel is on my list.

Can you cast a barrel around a cast iron sleeve or do you have to cast, bore and then insert new sleeve afterwards ?

[Frits Overmars]

Can you cast a barrel around a cast iron sleeve?

One can, and one has; it's called the Alfin technique.

[jonny quest]

RS250 cranks, I have one here to rebuild. Where can I order the parts to rebuild?

[WilDun]

One can, and one has; it's called the Alfin technique.

Wasn't that process used a lot by Kawasaki back in the sixties and seventies? - not so sure that they were the first to use it though - that honour might have gone to Velocette (by my fast fading memory).

UPDATE: Sorry, seems it was invented by the Fairchild Aircraft Company in America.

[Nath88]

I took the injected YZ for a decent ride on the weekend, about 150km of mountain roads. Averaged 4.7L/100km! Down from 7 on the carb. I'm still figuring out what air fuel ratios it likes, gradually leaning it out based on how thick the blue cloud is, so there's more fuel economy to come. Will need some dyno time to find the best full throttle mixtures through the range. I haven't experimented at all with injection timing, currently injection starts at 135°, Injection duration at idle is about 20°. I could probably delay the injection at light loads for less loss to the exhaust, potentially more gains to come in this area.

Biggest development lately has been incorporating the exhaust pressure feedback over a range rather than a switching point, and at all engine speeds rather than just on the pipe. I originally had the fuelling set to double when exhaust pressure reached 1.02x atmospheric pressure, however I found that at 100km/h cruise (~7% throttle, 6500rpm) exhaust pressure was only 1.01, so it didn't trigger the additional fuelling and the mixture went extremely lean. So now the additional fuel is added progressively as exhaust pressure ranges from 0.98 to 1.04, which is where the pressure fluctuates at idle and light throttle. The result is a very carb-like analog feel, it idles and cruises more smoothly, and the revs don't dip when returning to idle. The highway cruise problem is solved, it will now tolerate small throttle openings without four-stroking, it sounds a bit strange cruising smoothly from 80km/h up. Very happy with how its going, still needs tuning on the high rpm transition, doesn't quite feel like a 4 stroke yet.

If you're in Brisbane and want to test ride it, PM me.

[F5 Dave]

Don't be a cheaparse Wallace get it plated, the benefits are well covered in this thread. Obviously the Bucket foundry thread has mondo info to absorb.

[2T Institute]

RS250 cranks, I have one here to rebuild. Where can I order the parts to rebuild?

Honda or Aprilia?

[marsheng]

Don't be a cheaparse Wallace get it plated, the benefits are well covered in this thread. Obviously the Bucket foundry thread has mondo info to absorb.

I think making a sleeve with time and materials is probably more expensive than plating. The main plus of this is, I can CNC the sleeve with all the right port sizes and angles. The 2 other advantages are, I can change the port timing later on and I can use all those new +.5 +1.0 +1.5 pistons I have.


Still investigating it all.

Cheers Wallace.

[Grumph]

I think making a sleeve with time and materials is probably more expensive than plating. The main plus of this is, I can CNC the sleeve with all the right port sizes and angles. The 2 other advantages are, I can change the port timing later on and I can use all those new +.5 +1.0 +1.5 pistons I have.


Still investigating it all.

Cheers Wallace.

If you decide to cast and plate, check with NZ Cylinders as to what single cylinder top anode plates they already have. If they don't have what you want, making one is an expensive part of the plating job.

[jonny quest]

Honda or Aprilia?

Hondas Road Race only version. Have to check year, but it's definitely one of the last versions made. Looking for rod kits, and outside and center bearings/seal.

[husaberg]

Hondas Road Race only version. Have to check year, but it's definitely one of the last versions made. Looking for rod kits, and outside and center bearings/seal.

http://www.risingsuncycles.com/bikes...25/rs125pa.htm

http://www.samarin.net/?productos
http://www.samarin.net/?productos=&a...nas=2&&id=1379

[Frits Overmars]

... making a sleeve... I can use all those new +.5 +1.0 +1.5 pistons I have.

Isn't that a bit like starting to smoke because you found a packet of cigarettes?

[F5 Dave]

I think making a sleeve with time and materials is probably more expensive than plating. The main plus of this is, I can CNC the sleeve with all the right port sizes and angles. The 2 other advantages are, I can change the port timing later on and I can use all those new +.5 +1.0 +1.5 pistons I have.


Still investigating it all.

Cheers Wallace.

If it has to be a sleeve make it ally and plate it. But a 250 is huge so easy to tickle the ports. Try it on a 40mm bore.

[2T Institute]

Hondas Road Race only version. Have to check year, but it's definitely one of the last versions made. Looking for rod kits, and outside and center bearings/seal.

Centre bearing/seal is available I will have to post a pic later. Will depend on if you have 24 or 25mm crank pins sounds like NX5 or NXA(NX5 has single side swingarm NXA dual) which might have 25mm crank pins