RGV250 rebuild?

[imdying]

Use the 22D30, or a Zeel box, or if you're using aftermarket chambers, possibly an RS250 SAPC (although only if you can get one free).

Don't worry about the cracks, they all have them. Check the rear set mounts too, make sure they're not bent inwards.

[Asher]

So the 22d30 and rs250 sapc are the only TRUE unrestricted ones

[Drew]

So the 22d30 and rs250 sapc are the only TRUE unrestricted ones

Looking at all the info, that question is too simplified to be answered properly.

Here's the bottom line. You can get someone to design and make a set of chambers, port it properly, and really get the thing to breath, and achieve closer to 65 horses. That would be unrestricted. Just, not reliable for a road bike.

[Asher]

Ah, when i was reading it i was looking at the 23D00 not the 22D00, looking like i might need to get my hands on a 22D30 then.

I got a bit done today. I made put the wheels and swing arm back on the new frame so its now a rolling body and can move it out of the way.
I starting putting back all the electrics that bolt onto the subframe.
The painted silencers are hanging in the garage drying, i used a gloss black engine enamel paint that should be good for 120C which i hope is enough.
I got some high temp paint to do the chambers with also.

I made a start of the seat cowl:
I took off the cover and had a big battle trying to get a rusted bolt out. I had to drill it out eventually and put a nut in its place:





Then i stapled the sheet of fiberglass to the base of the seat and used the foam as the mold:


I left it dry overnight and will put another layer on it tomorrow.

Tonight i might make a start on pulling the clutch and gearbox out of the engine i just damage, or not, im feeling quite tired tonight.

[Asher]

Started to strip the engines downs to swap parts and came across this nice surprise:

Carbon reeds.

Can anyone tell me how the intake manifolds are meant to be set up.
The ones i have have been cut and blocked:


The other ones loop back to itself:


Which way is right?

This is where i left them for the night:

[Drew]

I don't recall rgv's running single ring slugs, I'm wondering if coupled with the carbon reeds if you're not holding an ex race motor.

Also, you need to talk to someone who actually knows his shut with two strokes before you go plumbing those hoses (which I think are just emission shit that you don't want anyway) back up.

Carbon reeds chucked in a standard motor, are probably not gonna make it better. Cases and ports need altered and timing is crucial to avoid flutter.

This is all second hand from a guy who does know his suit. Pm TZ350 on here and do it right or you'll end up with a very pretty melted heal of shit.

[Asher]

The motor that in getting all the parts out of is from a race bike. I will check it for porting, is it the intake or exhaust that is usually modified.

[Drew]

The motor that in getting all the parts out of is from a race bike. I will check it for porting, is it the intake or exhaust that is usually modified.

Both, check for grind marks around all the port holes. If there are any then ya need so
Done to throw a dgree wheel on there and look at the timing of them.

Also, do you still have the head and base gaskets that came off the motor? Ya need to know if the whole barrel was lifted or lowered too.

Everything is critical to a good tune, and reliability.

[Drew]

Someone with a degree wheel.

Stupid fuckin iPhone!

[imdying]

Ok the SIPC hoses you'll want to replace if it's a road bike; they go up around the headstock and back. The plumbing is in the manual.

The SAPC doesn't matter; if you run Tyga pipes the PV curve won't be optimal anyway, if not use the 22D30. Use OEM reeds if you have them.

[Drew]

Ok the SIPC hoses you'll want to replace if it's a road bike; they go up around the headstock and back.

Oh, someone who knows what those are. Share the wealth, what's the guts?

[Fast Eddie]

Oh, someone who knows what those are. Share the wealth, what's the guts?

i have them on my rs250.. just seem to be a couple of really long hoses that hook the 2 intake manifolds together eh? is that right imdying?
pretty sure mine ran just had hoses going from one intake manifold to the other x 2. thats how i hooked it back up anyway haha.
no idea what they are for.. I thought some sort of balancing/vacuum

[Drew]

i have them on my rs250.. just seem to be a couple of really long hoses that hook the 2 intake manifolds together eh? is that right imdying?
pretty sure mine ran just had hoses going from one intake manifold to the other x 2. thats how i hooked it back up anyway haha.
no idea what they are for.. I thought some sort of balancing/vacuum

I think they are meant to go back to the same side they come from. A two stroke twin should never have an open avenue between the carbs or cases, or chambers for that matter. They must be tuned as two singles or ya can't get it right for either.

[imdying]

Yeah Drew, they're basically 'boost bottles' which you've probably come across on all sorts of crap. Gives the intake tract a little volume to push back and forth in. On a top end only bike, you remove them, on a road bike, you leave them in place. I've seen back to back runs with them changed, and there's not much in it.

They plumb back to the same inlet manifold, they do not cross between cylinders. The length is somewhat important, 735mm or something... I can measure some, but would need to dig them out (my bike doesn't have them, or even a place to connect them to).

The plumbing for them is in the manual, chapter 8, section 11.

[Asher]

Thanks that's what I needed to know, I will get some rubber hoses to replace them.
I thought they were for balancing the carbs too.
Why are oem reeds better than carbon? I have both but figured carbon ones couldn't hurt.
I saved the base gaskets which is apparently 1.4mm and the heads use o rings.
I plan to use the engine I got from imdying the cylinders from my road bike and the carbs, heads and gearbox from the race bike.