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Re: Supercharged CBR250 build

Posted: Tue Sep 09, 2014 1:01 am
by RGV
6 plugs Tiny? You holding out on us?

Ya running any top end lube?

Dave

Re: Supercharged CBR250 build

Posted: Tue Sep 09, 2014 7:29 am
by Stayt`ie
from what i can see, for an Alky plug their lookin pretty safe for lsr, 8) , 9's or 10's, :?:

can you post up a closeup side shot of the electrode, so i can have a look at ya timing, :wink: ,,

Re: Supercharged CBR250 build

Posted: Tue Sep 09, 2014 10:47 am
by gennyshovel
Stayt`ie wrote: can you post up a closeup side shot of the electrode, so i can have a look at ya timing, :wink: ,,
Nope, for 2 reasons Ronny, #1 is my camera ain't that good, and # the timing cant be changed mate.
I'll fatten up the pilot 'cos it's near impossible to start, A/F 6ish, no changes when pilot air screw is either closed, or out 3 turns (gas pilot is #45, there's a #90 in it now, will fit a #100 next, maybe drill the orifice 11 tho bigger if needed, go a bit bigger on needle yet to get rid if the miss (never had a miss before, but it's been filthy rich, not according to the innovate LM1 & bosch 4.2 combo, which has been telling lean lies

Re: Supercharged CBR250 build

Posted: Tue Sep 09, 2014 6:17 pm
by Stayt`ie
sweet, dont be wasting ya money on cameras mate, :lol: ,,

6.45 Alky equates to 14.7 Gasoline, + or - ,, most fellas(fast, naturally aspirated) i have spoken with at Bonneville target a/f's in the 12.7-8 range on Gasoline, this equates to around 5.6(fatish) with Alky, :D ,, my bike runs its best a little fatter with a/f in the low 5's,, always keep in mind that most if not all of the information out there is based on hemi head motors, pentroofs, i have found, like more juice, :wink: ,,,

Re: Supercharged CBR250 build

Posted: Mon Sep 22, 2014 7:06 pm
by gennyshovel
I'm almost ready for 2015, just need to fatten up a bit more (any suggestions Dr Goggles ?) :roll:


http://youtu.be/5xLWzshRkwY (the sound of today's test'n'flog)



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That was easy, NOT . :oops:

Re: Supercharged CBR250 build

Posted: Wed Sep 24, 2014 9:32 am
by AuotonomousRX
Hey Tiny

Good to see your are making head way 8)

did the Power Jet you fitted make any difference to the Tune?

Pete :D

Re: Supercharged CBR250 build

Posted: Sun Sep 28, 2014 5:20 pm
by gennyshovel
It's working !
Last jet change went from max Power Jet and #620 main, to 3 turns out & #640 main, the plugs look a bit cooler after the last run, next run will be with #680 main, same 3 turns & hopefully, the plugs will look like new when pulled out, if so, I'll lean off with the Power Jet until I get some heat into 'em,then throw new plugs in and fine tune the color out, then I'll have a tune to avoid and get a few trips down the salt before adding more boost :shock: ?

Re: Supercharged CBR250 build

Posted: Sun Sep 28, 2014 7:04 pm
by AuotonomousRX
Good news Tiny 8)

Pete :D

Re: Supercharged CBR250 build

Posted: Sun Nov 02, 2014 7:36 pm
by gennyshovel
The last chore was to fit a 12v normally closed solenoid to turn off the fuel supply when either the kill switch, or the lanyard switch operate, I discovered a while back that fuel still trickles thru the pump even when it is turned off, not much, but still too much, this solves that problem.
Fitting the fire sleeve was a pitta, but all unswitched hoses are protected as per the rule, and fuel can be turned off without my hands moving from the 'bars
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The carb in the pics is the gas carb, the fuel version will be used at the lake & the original fuel spigot is blocked, not as this one is, but permanently
Having a gas carb allows me to start the engine any time, without the pain of flushing & purging methanol when I'm finished fiddling

Re: Supercharged CBR250 build

Posted: Sun Nov 02, 2014 10:08 pm
by BONES
Hey Tiny
I still have that spare piston
Bones

Re: Supercharged CBR250 build

Posted: Mon Nov 03, 2014 8:22 am
by gennyshovel
Best you put it in your favorite stubby holder Bones, that way it'll make it to the lake next year :wink:

Re: Supercharged CBR250 build

Posted: Mon Nov 03, 2014 6:12 pm
by momec3
Tiny, when fitting fire sleeve shove the air nozzle in one end and lightly inflate as you drag along. Sometimes this helps install.

Re: Supercharged CBR250 build

Posted: Thu Nov 19, 2015 11:05 am
by gennyshovel
I guess I should update Laslo's illness post Speedweek 2016,
It died
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The good news is,,it's nearly ready to do it again, without carnage next time ?
Tiny

Re: Supercharged CBR250 build

Posted: Thu Nov 19, 2015 3:45 pm
by harky
you call that "mechanical Art " we all have too much of it
does anyone else find it "artistic "
expensive but interesting
I have a conrod from a F5000 , that hit a flag marshall @ Phillip Island , grazed his leg !!!!!
it was from a race car I was working on ------- he came up to us after the event to ask if we wanted it back !!!!!
the block was like swiss cheese ---------- I told them it was past its "hours" useby date !!!
It was a repco holden F5000 engine ---- be a rare item now
harky

Re: Supercharged CBR250 build

Posted: Thu Nov 19, 2015 11:52 pm
by RGV
Bloody hell Tiny, I got away pretty lightly I would say. Thats a mess.

Dave