Will I get my 100 ready in time for Taupo?

[F5 Dave]

a 50 gets in there real nice. Everything else is a mission & then you have to put up with a shock where the carb should live. CC induction helps there of course, but still a constriction to work around, even an RS has kinked inlet, but hooaa PWK39. If i remember I'll measure the mount. But many other constrictions, like the skinny frame & the fact the RS has a narrowed MX based engine at the sprocket section.

[husaberg]

a 50 gets in there real nice. Everything else is a mission & then you have to put up with a shock where the carb should live. CC induction helps there of course, but still a constriction to work around, even an RS has kinked inlet, but hooaa PWK39. If i remember I'll measure the mount. But many other constrictions, like the skinny frame & the fact the RS has a narrowed MX based engine at the sprocket section.

It is indeed a Crankcase induction and not a lot unlike a RS125 engine.
what is the rear mount width?

Vanessa has landed in Tauranga BTW.

[F5 Dave]

one of the kids is waking up, grumble impatient bastd. ok 79mm it seems to be.

[husaberg]

one of the kids is waking up, grumble impatient bastd. ok 79mm it seems to be.

Over 40 with sleeping Kids Dave No wonder your Grumpy sometimes

Ps thanks for the measurements. Thanks indeed I say with a Machiavellian laugh echoing around the garage.
As all his best laid plans are either crushed or fall into place nicely.

Anyway most appreciated.

[husaberg]

Found this for RS125 and similar. But from memory some bikes ahad a remote theromsats (VT i think) and probably lots of cars as well. But then again you don't want to do the thermostat route. I suppose.
http://www.rscycles.com/images/thermostat/therm_guhl.htm

[Sketchy_Racer]

The Guhl bypass thermos are great, I used one on my RS125 when I was racing that, never bothered pissing around with tape again, but at around $250NZ to get one its bloody expensive in terms of buckets!

If you can find a 55-60 degree thermo stat you could make one pretty easy though, I think aprillia RS125s thermostats are at around that temp.

[TZ350]

Found this for RS125 and similar. http://www.rscycles.com/images/therm...therm_guhl.htm

My guess the temp is in deg F and 130 F is about 54 C

[jasonu]

I never used a thermostat in my KERG100 with an RG50 based pump and never had a problem. Temp always stayed around 55-65 deg. On the odd occasion I had to put a strip of tape on the radiator.

[husaberg]

Not that dave will care but snooping around I found these Rover stuff.

Pressure Relief Remote Thermostat

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A Pressure Relief Remote Thermostat (PRRT), or sometimes just PRT, is used to increase the amount of coolant flowing around the engine. The PRRT has a bypass valve opening when the coolant pump is flowing too much coolant for the radiator circuit. This valve is reducing pressure difference inside the whole circuit, achieving at the same time a more constant temperature inside the engine.

Note: The acronym PRT means Pressure Relief Thermostat. This setup was developed by Bill Hutchins and used by Rover, MG and Landrover, it has been in use in mid engined cars for 25 years, and an Elise system was previously developed by Simon Scuffham when racing his k-series engined elise. PRRT is actually a misnomer (albeit harmless), allegedly invented by one of the members of the Seloc forum. The PRRT acronym may not actually be recognised by anyone outside of the Seloc forum (including anyone involved in the design, manufacture or assembly of the device) though is perhaps a more accurate description as the second R refers to remote.






remote stat with by-pass BMW/Rover SD1 2600/etc

http://www.mgfcar.de/thermostat/Water_System_Mods.htm

[F5 Dave]

great, so if I want to run it at 90 degrees I'll know where to rat parts.

Also temp switch means not forgetting to turn on pump & conserving battery life.

Ideally when I get a alternator incorporated I won't have to worry about charged batteries, cause that's a pain.

[Duke Stealth]

As discussed earlier, for Daves eyes only, who am I kidding!

[jasonu]

As discussed earlier, for Daves eyes only, who am I kidding!

What is the last pic of?

[Number One]

What is the last pic of?

It's a secret....

[F5 Dave]

end on of stinger same as RS125 arrangement.

[F5 Dave]

Well initial tests haven't been super promising as I was hoping. I had to advance the ign quite somewhat & the mj went up in size. Didn't have any bigger to try but it looked like there was little left.

and. . despite a considerably different pipe with esp an inlet far more size suitable to the 100. . the power curve was surprisingly similar.


So what are the known faults? I have a 2nd hand piston (put in last min when my original showed a tear in it) which some muppet has filled to increase transfer timing, something that isn't what I want & reduced the squish area to sod all.

Today I've now fitted my new YZ100 piston & machined the head considerably shallower to a more modern shape. After adjusting the squish I measured the com at ~14:1 which was my target for aircooled bike. I should have measured twice to be sure, but I wanted to believe it was right, what a fluke. The squish angle now matches the YZ piston which is less domed than the MB one.

I also noted the flange needed to be slotted to align with the ex outlet as it missed by ~3mm. That was my fault as I got the flanges made to a template & I should have checked better.

Keen to get back to the dyno & retry it all out, but run out of time today.

I've started a wc head so will be able to run a higher com for sure.

The unknowns are:
The missing & guessed at powerjet size, I seemed to lose power dicking around with this carb a few sessions ago so need to retest it. I don't like this carb, but it is my only sane option as the inlet is on an angle that a std carb won't play.

The inlet it on too much angle I'm sure.

The reedblock is likely too big. Maybe to packers may be worth testing.

The cases leak. I know this but how much it is affecting power who knows? New cases will answer that, but are a month off at least, then I have to alter the frame mounts as they will be different.