ESE's works engine tuner

[Rick 52]

Yep I am taking the RS for a splash around ..I hope the weather will be dry at some point over the weekend..

[ac3_snow]

going by metservice saturday is the best chance of dry whether.
will have to wake up in the morning and check the weather string.

[koba]

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One week to go before Taupo and this is where I am at.

The engine vibrates real bad and I need to re-balance it.

As there is no one universally "correct" balance factor, there is only the one that works in your bike and it has to be found by trial and error.

Engine frame and suspension all affect how much you feel the vibration given off by the crank. The likely range of ballance factors that will work well with a high speed 2-Stroke seems to be in the region of 50% to 65%



Check out the quote for info on working out ballance factors and how to change them.

Yum. I have a bit of a thing for old lathes, that one looks lovely.

[TZ350]

Yum. I have a bit of a thing for old lathes, that one looks lovely.

It belonged to Chambers Dad and that makes it a bit special. The lathe is called "Mr Rattley", and its been very useful.

[F5 Dave]

V belt & tool post! Makes my Sheldon look old fashioned.

[gatch]

V belt & tool post! Makes my Sheldon look old fashioned.

The owner of my race bike, Chris has a wee Southbend on his bench, now that thing is neat.

[TZ350]

Ok got it going, I had problems with the new cylinder, it had been bored for a 0.002" interferance fit, instead of clearance on the piston.

So I got onto it and linished the piston down 0.004" to fit and with the new re-balanced motor all assembled and in the bike.

This is where I am upto now.............



Tried each of the centre section inserts in turn.



The RS chamber (red line) with a 60mm mid section insert compaired to my old 21+ hp GP125 (blue line)




Power went up and the curve moved to the right as the pipe got shorter.



Blue line is where I am now, 23+hp, not shabby for a hand linished piston, so I guess I got the cam and taper right.

I havent finished with the pipe yet but I think whats left of the dip in the cammel hump will be able to be pulled out by increasing the inlet duration and dialling in some ignition curve instead of the straight line I have been using for testing the pipes.

More to do but it looks like it has 23+ hp potential and a 3-3.5K wide power spread.

[gatch]

.

Ok this is where I am at now.............

The end of the sentence ?

[Buckets4Me]

The end of the sentence ?

there is still time to come up with another plan and pull it all apart AGAIN !!!


Last year I had 18.5 h/p
Ned Kelly had 20
TZ350 had gearbox problems and around 20 h/p
Chambers had a 22h/p 100 (that threw everyone off that got on)
Speedpro failed to get the gearbox working as well

now it look like I'm not riding
chambers is watching
Ned Kelly has 10% more H/p
and TZ may or may not have fixed the gearbox and 15% more power
Speedpros bike has been tested and is around 30 h/p

bring on Christmass I say

[F5 Dave]

Well that is quite impressive for a GP125. Bit scary revs for a GP crank thou.

[TZ350]

.

This is where I am at now with my bike....... only days to go.



Testing has stoped for the day,......... slipping clutch at 11ish.

[Buckets4Me]

.



Testing has stoped for the day,......... slipping clutch at 11ish.

Just test it changes gear properly this time huh TZ?

so thats 30% more H/p in a week !

[TZ350]

quite impressive for a GP125. Bit scary revs for a GP crank thou.

Crank:- RGV250 rod kit with silver plated big end cage and rod side play set at the little end. Double row, self alligning phenolic caged main brgs, light weight KX ignition flywheel.

[koba]

Hardouts!

[bucketracer]

TeeZee's bike.......

Thomas has cured the clutch slip and they are now getting 27+hp from an aircooled 125 with a legal 24mm carb.



Three Times Past.......


Fuel Fog appears in the bellmouth of TeeZee's carb as the engine gets up on the pipe.

Can those that said three times past does not happen explain where this fuel mist in the bell mouth comes from when the engine is up on the pipe if the air mass is not moving back and forth in the inlet tract and passing the main jet at least three times like TeeZee explaind it would on a well tuned bike.