#6

[speedpro]

Oil is Elf HTX909 at 25:1 or 40mL per L.

I had been using Motul 800 at 40:1 for years or forever I don't quite remember but when I started running kart pistons at close to kart motor revs I decided to use what the kart shop guys use. It's supposed to be some sort of synthetic castor oil. So far the motor has always looked good when I've inspected it.

[speedpro]

New bit fitted. 36mm Keihin with TPS and electronic powerjet.

[koba]

36!!!

Fuck oh dear!

P.S. ever noted down the Crankcase volume of a std MB100...?

[Henk]

P.S. ever noted down the Crankcase volume of a std MB100...?

276 cc

Ten things

[F5 Dave]

mm, that seems more than big Henk.


Carb looks good, be interested to see how it runs & what sort of angle you can get away with. I have a 36PWK resting on some cases atm but the non TPS model as the RS shock sits to the left, just where the newer carb has it. I'll have to mount the TPS elsewhere. Either way it can wait, I don't have the pingas for an ignitech, just want to make sure I have the room.

[Henk]

mm, that seems more than big Henk.

Probably, I just took a wild arse guess to wind Koba up, surprised you didn't pick up on it.

[koba]

Probably, I just took a wild arse guess to wind Koba up, surprised you didn't pick up on it.

Your wild arse guess actually had some interesting results. I think I'm just going to have to measure what I have and derive a std figure from that. I guess if I can fill in the sections I have taken out with Plasticine or similar I should be able to back track to a rough figure for std.

[quallman1234]

Your wild arse guess actually had some interesting results. I think I'm just going to have to measure what I have and derive a std figure from that. I guess if I can fill in the sections I have taken out with Plasticine or similar I should be able to back track to a rough figure for std.

Fuck that, just do what you have atm and call that close enough to stock...

[F5 Dave]

Probably, I just took a wild arse guess to wind Koba up, surprised you didn't pick up on it.

yeah the maths for a 100cc cylinder was pretty obvious, i was wondering where you were going with that. If you'd said 850ml it would have been funny as its cast on the gbox filler.

[Henk]

Haven't looked closely enough at an MB100 motor to know that, after all two stroke engines are really only suited to gardening equipment.

[koba]

I'm playing with MOTA.

Kyle and I went 1/2s in it from the ESE guys.

The numbers I plug in as guesses actually seem to make quite a big difference.

I'm still learning and putting shit in to get shit out.
I'm mindful that it may not reflect reality 100%.

All interesting stuff though.

EDIT: Speedpro, sorry for the standard bucket forum thread hijack.

[Henk]

I'm still learning and putting shit in to get shit out.
I'm mindful that it may not reflect reality 100%.


EDIT: Speedpro, sorry for the standard bucket forum thread hijack.

Close is good enough surely.

And Speedpro, he's lying, he isn't sorry at all.

[speedpro]

Been playing with a laptop given to us by the sister-in-law. Fitted a USB-serial cable, loaded the software, and connected it to the Ignitech. I fed 12v to the ignition from a battery and it all connected just fine. I now have the programming that we did on the dyno safely stored away and have done a few changes to reflect the powerjet and TPS. It comes up with a funny looking ignition map by default when "3D" is selected so it'll be interesting to see how that compares with what the dyno tells us is needed.
I have been playing with another MB in the garage and found a big mismatch at the exhaust port flange and the pipe. The pipe was 5-6mm smaller diameter - no wonder it wasn't making any power. I've fitted a proper slip-joint and fitted a copy of the good pipe for my motor. With the exhaust port mods I've done it'll be real interesting on the dyno.

[F5 Dave]

yeah its real easy to get those ex ports to flare out without trying. My last RS125 pipe I tried to bring in as 40mm was waay too big. Std MBs are ~32 so the question is where to run them with the std single port. I've tried my new pipe at 34 to try the small end of the scale.

[jasonu]

[QUOTE=speedpro;1130208205]
I have been playing with another MB in the garage and found a big mismatch at the exhaust port flange and the pipe. QUOTE]

My and Picketts 1991 RS125's both had ex port outlets that didn't fully match the exhaust flange. The flange was bigger in some places. We decided Mr. Honda knew more than us so we didn't touch it.
However, 'Ride 'em 'till they blow' Owen Wilson ground his ex port outlet to match the flange and made his bike slower.