ESE's works engine tuner

[Flettner]

OK, so who out there would have an RZ 350 ish autolube oil pump that is still in working condition but doesn't want it any more? For the 700 twin project, a bit hard to mix the twostroke oil in with the LPG fuel.

[F5 Dave]

They are rebuildable still, ive saved some details. and there's a UK chap doing higher rate conversions, I'll ignore the Aus versions. Still hanging on to mine just in case sorry

[Yow Ling]

OK, so who out there would have an RZ 350 ish autolube oil pump that is still in working condition but doesn't want it any more? For the 700 twin project, a bit hard to mix the twostroke oil in with the LPG fuel.

Pm me your address and ill send one

[wobbly]

Sent him a new one Yow

[Flettner]

Thankyou guys, the heat treated castings will be back tomorrow ready to machine into two 700 twin engines.
Cylinders will be back on Friday and after machining off to NZ cylinders for plating.
Heat Ranger, the heat is on.

[Martin1981]

Wobbly, what is the Topspeed of the 125ccm Shifter Karts on the fastest circuits? thanks

[wobbly]

Fastest I have seen on our data is 134Km/Hr, but we tend to gear for the slowest corner/infield, and use big overev ( 15,000 ) to achieve the terminal speed needed.
So we are well past peak Hp, and could go alot faster in a straight line with taller gear.
Euro tracks are much faster, and regularly see 150K.

[Grumph]

Fastest I have seen on our data is 134Km/Hr, but we tend to gear for the slowest corner/infield, and use big overev ( 15,000 ) to achieve the terminal speed needed.
So we are well past peak Hp, and could go alot faster in a straight line with taller gear.
Euro tracks are much faster, and regularly see 150K.

I hear there's a kart meeting on full track Ruapuna coming up. I'd imagine well over 150K would be achievable there but I'm sure someone will have the data.

[RomeuPT]

Cheking things before next meeting, opsss

Honda RS 125 piston.
Too dry underneath? Too much advance? Lean Carburation?

[Reckless]

Kart speeds
Back in the day (20 years ago) we where getting about 100-110mph (170k) out of our methanol powered 125 MX engined open class shifters at Manfield I think?.
Geoff Downs and especially Ian Bias (for many years) the fastest in 125.
I txt a good mate who is currently racing in 250 single and he reckons 195-200k out of that class and the NZ Rotax superkarts are doing about 220k at Taupo last meeting.
Most top speeds are exaggerated but I'd stick by his word. Of coarse the kart doesnt get its lap time from its top speed as we all know.

Superkarts in England have been getting 250k for years. I thought they'd slowly get faster but it seems to be the limit as it has been this for as long as I can remember.
I guess they have maxed out the torque vs gearing vs top speed limit LOL.
Wikipedia
Powered by a 2-stroke 250 cc engine producing 62 hp for an overall weight including the driver of 205 kilograms, Superkarts have a power/weight ratio of 440 hp/tonne (330 W/kg)(c.5 lbs/hp). Superkarts can accelerate from 0 to 60 mph in less than 3 seconds with a top speed of 155 mph (250 km/h).[8] Their low weight and good downforce make for excellent cornering[9] and braking abilities.[10] A Superkart is capable of braking from 100 mph (160 km/h) to standstill in around 2 seconds, and taking corners at nearly 3 g (30 m/s²).[11

Love this thread from the sidelines great read, keep it up lads

[twotempi]

Cheking things before next meeting, opsss

Honda RS 125 piston.
Too dry underneath? Too much advance? Lean Carburation?

Underside of piston looks fine - ditto the top.

Check your ignition timing.

[wobbly]

There is No heat going into the piston from advanced ignition as there is no darkness underneath.
RS125 ignitions retard shitloads after peak torque to get heat into the pipe and make it rev.
Thus I suspect a combination of not enough static advance to go with the head cc, and running too lean.
All give the end result of alot of heat in the header - too much in this case.
What fuel, what cc, what static advance?
The other possibility is that the later RS125 has the ability to change the powerjet switch rpm, maybe its too low.
But another suspect is maybe the powerjet is too big, and too much fuel is being turned off by the solenoid when in the overev area past 12500.

[speedpro]

There is No heat going into the piston from advanced ignition as there is no darkness underneath.
RS125 ignitions retard shitloads after peak torque to get heat into the pipe and make it rev.
Thus I suspect a combination of not enough static advance to go with the head cc, and running too lean.
All give the end result of alot of heat in the header - too much in this case.
What fuel, what cc, what static advance?
The other possibility is that the later RS125 has the ability to change the powerjet switch rpm, maybe its too low.
But another suspect is maybe the powerjet is too big, and too much fuel is being turned off by the solenoid when in the overev area past 12500.

That narrowed it down

[F5 Dave]

In case you aren't following the foundry thread. Check this lot out

Second load of picture of Neil's work.an army of bits

http://www.kiwibiker.co.nz/forums/sh...Foundry/page57

[TZ350]

Guns in Roses.

Starting to get somewhere with the EFI thing, started again from the beginning, and started working in small steps from the bottom up this time and now it is beginning to come back on the throttle Ok.