[TZAR]

Cool One huge lumpy top piston that takes two guys to kick start it and when it kicks back sends the two guys accross the room

[ball]

Boring crankcase to suit big cylinder






The cylinder fits


So does the head




Studs are too short now and they are an oddball size that is going to be fun to find

[steak_knife]

Booker rod & tar should hold that head down..

[ball]

steak_knife wrote:

Booker rod & tar should hold that head down..

I have never seen booker rod in 7mm. I had enough trouble finding some nuts to get the studs out.

[TZAR]

ball wrote:

steak_knife wrote:

Booker rod & tar should hold that head down..

I have never seen booker rod in 7mm. I had enough trouble finding some nuts to get the studs out.

1/4 is close enough

[ball]

TZAR wrote:

ball wrote:

steak_knife wrote:

Booker rod & tar should hold that head down..

I have never seen booker rod in 7mm. I had enough trouble finding some nuts to get the studs out.

1/4 is close enough

The pitch is to coarse, they wouldn't go in more than half a turn.

I will probably just tap them out to 8mm

[shep]

ball wrote:

steak_knife wrote:

Booker rod & tar should hold that head down..

I have never seen booker rod in 7mm. I had enough trouble finding some nuts to get the studs out.

mitre10 has some weirdo size lengths of metric.

[ball]

shep wrote:

ball wrote:

steak_knife wrote:

Booker rod & tar should hold that head down..

I have never seen booker rod in 7mm. I had enough trouble finding some nuts to get the studs out.

mitre10 has some weirdo size lengths of metric.

They need to be about 100mm long

[shep]

the lengths they have are 800 or so long. they are on the end of a isle near the work boots just get singie to pinch a heap for ya

[Joe]

haha this thing is gunna be

[ball]

Just ordered a stroker crank and a set of carbon fibre reeds.

Out to 90cc now.

[atari4x4]

one of my mates has a chinese KYMCO CVT scooter, that's got a big bore kit & head, larger carby, expansion chamber exhaust & different weights & other stuff done to the CV Transmission... it absolutely flys, it struggled to get past 50kph originally & that was with the speed limiter bypassed.

[shep]

did something shit on the head?

[laurie]

hmm
i just had someone behind me say "awsome"
i wonder where he picked that up from.

[ball]

shep wrote:

did something shit on the head?

corrosion, it was sitting in the weather at the scrap yard.

a quick blow over with the bead blaster will make it pretty again

[shep]

don't forget ya camera for the AZ science experiment.

[ball]

shep wrote:

don't forget ya camera for the AZ science experiment.

i can't find it, the mrs has gone mad with cleaning again

it has been put in a safe place, she just can't remember where

[shep]

is it going yet?

[ball]

shep wrote:

is it going yet?

Bloody slow postage from overseas somewhere. You think I would have my stuff after a day or 2.

I am waiting for the crank now and can't even do the porting without it.

[dave]

I recon you should just tec screew it on and zip tie it back together.

[ball]

dave wrote:

I recon you should just tec screew it on and zip tie it back together.

fukin builders

[Joe]

ball wrote:

dave wrote:

I recon you should just tec screew it on and zip tie it back together.

fukin builders

Shep does it and it works for him so it should work for you too

[shep]

fuck no joe. dave is the roughest fella in the world. plus he is a kiwi.

[honks]

well i'm a plumber so i say silicone and duct tape should sort it out

[shep]

honks wrote:

well i'm a plumber so i say silicone and duct tape should sort it out

steady on mate, this is the NT and we don't need to over engineer stuff for rego.

[appsie]

this thing should be pretty cool finished
aerenandmel off here has a z50 he used to ride to work and the shops with a 125 thumpstar motor in it geared up a bit its a weapon

[31zook]

honks wrote:

well i'm a plumber so i say silicone and duct tape should sort it out

and im a boily, hammer the thing on and weld it together with wet GP rodz!

[jonno_racing]

appsie wrote:

this thing should be pretty cool finished
aerenandmel off here has a z50 he used to ride to work and the shops with a 125 thumpstar motor in it geared up a bit its a weapon

dont mention that.. some one coff coff ball will get angry

i actualy had a thought the other day...

since the cvt trans explode regulary.

whats stopping u geting a thumpser box (yep u hate them but hear me out)
and a 125 bore carbi head etc off 125cc dirt bike, something with the same stroke surely some one like you can match that up..
if you get a good lyfin box it will take the power easy, u will then have a clutch and a 4speed box?

just a idea

[jonno_racing]

Infact...

Lifin 125cc has a bore/stroke 54mmx55
Rm125cc has bore/stroke of 54.0 mm x 54.4 mm

i know rm is water cooled But surely there is something that will be a easy fit

[ball]

jonno_racing wrote:

appsie wrote:

this thing should be pretty cool finished
aerenandmel off here has a z50 he used to ride to work and the shops with a 125 thumpstar motor in it geared up a bit its a weapon

dont mention that.. some one coff coff ball will get angry

i actualy had a thought the other day...

since the cvt trans explode regulary.

whats stopping u geting a thumpser box (yep u hate them but hear me out)
and a 125 bore carbi head etc off 125cc dirt bike, something with the same stroke surely some one like you can match that up..
if you get a good lyfin box it will take the power easy, u will then have a clutch and a 4speed box?

just a idea

The bottom end in a 4 stroke bike engine is all wrong for a performance 2 stroke. You need to try and keep the crankcase volume small to help scavenge the fuel air mix up the ports into the combustion chamber. 4 strokes tend to have quite a large crankcase volume.

Go and have a look at some you tube videos of hotted up european scooters. They would destroy a 125 thumpstar.

The variable speed drives and the clutches are all tunable and parts are readily available.