YLR Racing

[Yow Ling]

Finished taping it up

1.05 KG !!

[Moooools]

Finished taping it up

1.05 KG !!

With enough poos as welding I'm sure you could get that out to 2.05kg.
Get that sweet as low COG.

[koba]

Finished taping it up

1.05 KG !!

Hmm, I'm guessing mine weighing just shy of 6kg is a bad thing!?!?

[speedpro]

Unless it doubles as a frame brace, on a Harley

[F5 Dave]

wow that is a super fat centre section. Looks bigger than my 500 (250) pipes. Best hope those transfers are way curved or it will over scavenge, but I bet an NSR barrel sleeved down will quite a bit. Haven't seen a 125 barrel but I have a 250 one.

[Yow Ling]

wow that is a super fat centre section. Looks bigger than my 500 (250) pipes. Best hope those transfers are way curved or it will over scavenge, but I bet an NSR barrel sleeved down will quite a bit. Haven't seen a 125 barrel but I have a 250 one.

Hi Dave , mine is based on the rgv250 cylinder not the Honda , I have faith in my leader, I just follow the instructions, is fat though !

[F5 Dave]

ah, side looked fairly hondaish, but I need re-calibrating.

[husaberg]

Hi Dave , mine is based on the rgv250 cylinder not the Honda , I have faith in my leader, I just follow the instructions, is fat though !

ah, side looked fairly hondaish, but I need re-calibrating.

Yeah Dave mine is the NSR based Motor Yowling was clever enough to start with a 50.6mm stroke engine that was freely available in NZ.
Mine from what Yoda/Obiwan. no scratch that Darth Vader says has a better crankcase so it will need less work.
Plus hopefully less filling than the RG/RGV.
The thing is with the transfers is. i think it will be easier to get the shaped Wob wants with fill than trying to cave out Air cooled 100cc cylinders to get the correct shapes as angles.
Time will tell but i are not going to be doing much racing on karts tracks and i guess neither will Yowling.
So they will need some big lungs.
plus with the engines designed for 125cc hopefully they should prove to be quite durable if a little heavier than the 100cc based engines.

[Bert]

..... I have faith in my leader, I just follow the instructions, is fat though !

.... Mine from what Yoda/Obiwan. no scratch that Darth Vader says has a better crankcase so it will need less work.
Plus hopefully less filling than the RG/RGV.
The thing is with the transfers is. i think it will be easier to get the shaped Wob wants with fill than trying to cave out Air cooled 100cc cylinders to get the correct shapes as angles.
....
So they will need some big lungs.
plus with the engines designed for 125cc hopefully they should prove to be quite durable if a little heavier than the 100cc based engines.

I'm real interested to see how both of these machines develop and what the dark load has in mind with crankcases and transfer shapes.
I think the sleeved 125cc option is going to be the way forward for F4 two-strokes but there is a few unknowns especially around temperature with the larger sleeves...

What size Carbs are either of you thinking of running? Speedpro was talking around a 36mm seems rather big?? but I do wander if my 29 is a little on the small size for larger tracks.

[husaberg]

I'm real interested to see how both of these machines develop and what the dark load has in mind with crankcases and transfer shapes.
I think the sleeved 125cc option is going to be the way forward for F4 two-strokes but there is a few unknowns especially around temperature with the larger sleeves...

What size Carbs are either of you thinking of running? Speedpro was talking around a 36mm seems rather big?? but I do wander if my 29 is a little on the small size for larger tracks.

I have a NSR250 carb (for downdraft and hondanishness)er.. not sure re the size (32mm i think) with TPS.
Plus i have a Keihin shorty 36mm but with a sleeve inserted with TPS and Solenoid in reserve. Waiting to see what will work with the chassis and the engine once they are in the same island. (Which will be hopefully soon) Carbs courtesy of TZ in a Swap.
i think to get the hp (insert big number here)with a 100cc. It will need plus 32mm anyway.TZ 30hp has the advantage of 25cc more to suck with.
But Wob is in charge of doing the numbers.

[Yow Ling]

Carb is 36mm same as Huss is talking about and same as speed pros, v force reeds and ignitech ignition, pipe is just too flash.
I'm hoping after it's going it will become the new fxr , something the cbr boys will want to have, we are lucky to have the assistance here in nz to be able to build them

if only it was more than 4 degrees outside, I may have gone to the shed to do stuff

[bucketracer]

I'm real interested to see how both of these machines develop ... I think the sleeved 125cc option is going to be the way forward for F4 two-strokes ...

Although we are enjoying playing with TeeZee's 125 air cooled TeeZee has been collecting parts for a sleeved 100 as a plan B that will probably go into that old NSR frame of Husaburgs. He has collected all sorts of parts including a set of Honda RS250 fully adjustable front forks.

The variety and quality of the 2-strokes and Buckets generally are getting real interesting, we just love it.

[Bert]

Carb is 36mm same as Huss is talking about and same as speed pros, v force reeds and ignitech ignition, pipe is just too flash.
I'm hoping after it's going it will become the new fxr , something the cbr boys will want to have, we are lucky to have the assistance here in nz to be able to build them

if only it was more than 4 degrees outside, I may have gone to the shed to do stuff

Yes; its very fortunate that there is significant assistance here in little old NZ; and most of all they offer up great information and advice for nearly nix in the scheme of things..


I also have a KX carb (same as Speedpro's); but every time I look down the intake I see future piston seizures... maybe I just need to harden-up and go for it (pipe as well).

Have you had much luck with finding a manifold that suits? or have you made your own.

4 degrees outside; sh!t I complaining about 9...

[husaberg]

Yes; its very fortunate that there is significant assistance here in little old NZ; and most of all they offer up great information and advice for nearly nix in the scheme of things..


I also have a KX carb (same as Speedpro's); but every time I look down the intake I see future piston seizures... maybe I just need to harden-up and go for it (pipe as well).

Have you had much luck with finding a manifold that suits? or have you made your own.

4 degrees outside; sh!t I complaining about 9...

It used to get to -9 at my old place. Now that used to take your breath away.
It also used to regularly hit 40 degrees in the summer with high humidly as well.

As yours is a Yamaha Bert i would try and look at some old DT and RT stuff. likely bolt on as well.
Yamaha weren't that imaginative.
The sites for Yamaha twins used to list what worked with what bolt spacing.
There are also sites that list new inlets for Banshe's and Blasters in lots of sizes.
I was thinking on setting up my old space-heater in the shed.

Did you ever manage to collate all the rod and piston stuff Brent?

[Bert]

It used to get to -9 at my old place. Now that used to take your breath away.
It also used to regularly hit 40 degrees in the summer with high humidly as well.

I'm in Palmy so 9 degrees all year round

As yours is a Yamaha Bert i would try and look at some old DT and RT stuff. likely bolt on as well.
Yamaha weren't that imaginative.
The sites for Yamaha twins used to list what worked with what bolt spacing.
There are also sites that list new inlets for Banshe's and Blasters in lots of sizes.
I was thinking on setting up my old space-heater in the shed.

I forgot that it was a yamaha... that aside I've seen the webpage that shows different reed/manifold options; but can't seem to find it now.
I know its the same reed block as the TZR250 1KT; but I'm looking for manifold that is straight (to enable the use of downdraft RGV/NSR carbs) and one that is 45 degrees that will take the larger MX carbs. was thinking that an adapter plate might be the answer if someone had come up with a simple readily available solution.

Did you ever manage to collate all the rod and piston stuff Brent?

PM sent; but yes I've nearly completed the database with/and filters (sh!t load of manual entry and a lack of time); I'll post the whole thing up when finished for everyone to enjoy...