125 gaskets

[noobi]

i want to do a piston and ring on my bike (07 EC125)
but my gasgas dealer doesnt have the stock 0.5mm base gasket, i emailed steve at motowest(tuning shop in the states) and he said dont change these unless you do head measurements squish etc, i dont really want to do this
could i just run the 0.3 mm and the 0.15 mm base gaskets to get as close to 0.5mm as possible or is this dumb?

also the piston that i can get is the wiseco GP piston for nikasil bores, steve at motowest said that the plating is nikasil but i looked in the exhauset port and there looks like theres a brown mark on the inlet side of the cylinder, dad says that nikasil wouldnt have that?
also the gasgas GP piston for an 07 ec125 is the same as a cr125 gp piston

this has been on the gasgasridersforum for 3 days and no replys, so i thought id ask you guys

thanks

[barty5]

i want to do a piston and ring on my bike (07 EC125)
but my gasgas dealer doesnt have the stock 0.5mm base gasket, i emailed steve at motowest(tuning shop in the states) and he said dont change these unless you do head measurements squish etc, i dont really want to do this
could i just run the 0.3 mm and the 0.15 mm base gaskets to get as close to 0.5mm as possible or is this dumb?

also the piston that i can get is the wiseco GP piston for nikasil bores, steve at motowest said that the plating is nikasil but i looked in the exhauset port and there looks like theres a brown mark on the inlet side of the cylinder, dad says that nikasil wouldnt have that?
also the gasgas GP piston for an 07 ec125 is the same as a cr125 gp piston

this has been on the gasgasridersforum for 3 days and no replys, so i thought id ask you guys

thanks

ask rupe for the contact for the guy in christchuch for gasgas he dealt with he is good with parts there is also a dealer/wrecker is hastings deal with yamaha as well.
And yes the piston is the same as the cr125gp quite a few parts on gasgas swap over to other bikes. As for the brown marks not sure with out seeing looling you need to look at the bore not the exhuast unless its been rebored or sleeved it should be nikasil.

[Rupe]

i want to do a piston and ring on my bike (07 EC125)
but my gasgas dealer doesnt have the stock 0.5mm base gasket, i emailed steve at motowest(tuning shop in the states) and he said dont change these unless you do head measurements squish etc, i dont really want to do this
could i just run the 0.3 mm and the 0.15 mm base gaskets to get as close to 0.5mm as possible or is this dumb?

also the piston that i can get is the wiseco GP piston for nikasil bores, steve at motowest said that the plating is nikasil but i looked in the exhauset port and there looks like theres a brown mark on the inlet side of the cylinder, dad says that nikasil wouldnt have that?
also the gasgas GP piston for an 07 ec125 is the same as a cr125 gp piston

this has been on the gasgasridersforum for 3 days and no replys, so i thought id ask you guys

thanks

On my 200cc I used the 0.3mm instead of the 0.5mm which was ment to give more compression (didn't notice this tho). I also used a wiseco piston kit in mine and it went fine, and I think you can use a yamaha yz125 piston in yours but you might want to find out more on that first.

If you ring Dirt Action Services 033890080 and speak to a guy called Linton, he know just about everything you could dream of on gasgas bikes. His prices inc shipping are normally better than everyone else to. trust me ring him, he'll know.

[noobi]

On my 200cc I used the 0.3mm instead of the 0.5mm which was ment to give more compression (didn't notice this tho). I also used a wiseco piston kit in mine and it went fine, and I think you can use a yamaha yz125 piston in yours but you might want to find out more on that first.

If you ring Dirt Action Services 033890080 and speak to a guy called Linton, he know just about everything you could dream of on gasgas bikes. His prices inc shipping are normally better than everyone else to. trust me ring him, he'll know.

the yz piston is the same for the gasgas 125s pre 07

triplexmoto in east tamaki are normally really good with parts, and steve the owner is a really friendly guy and normally gets back to me the same day about parts, gave me a number board for free when i broke the gay white one i had, but he said their supplier hasnt got any of the 0.5mm and only have the 0.3mm and 0.15mm

i emailed dirt action awhile ago and it wasnt linton that replied but someone else who didnt want to help much, il just call them instead sometime during the week

rupe, when you raised the compression did you run a higher octane fuel or change anything at all?

[Rupe]

the yz piston is the same for the gasgas 125s pre 07

triplexmoto in east tamaki are normally really good with parts, and steve the owner is a really friendly guy and normally gets back to me the same day about parts, gave me a number board for free when i broke the gay white one i had, but he said their supplier hasnt got any of the 0.5mm and only have the 0.3mm and 0.15mm

i emailed dirt action awhile ago and it wasnt linton that replied but someone else who didnt want to help much, il just call them instead sometime during the week

rupe, when you raised the compression did you run a higher octane fuel or change anything at all?

Thats a shame about the pre 07 thing.

Heard xxxmoto are ment to be good, but not really that close so was cheaper to pay freight than drive to xxx. Plus I did find Linton quiet a bit cheaper, but who knows.

The guy that would of emailed you would of been phil, you need to speak to Linton as he tends to be a lot more helpful. He is also the guy that told me what gaskets to use and what I need to do head wise, when I ordered a Gasket kit.

So yeah just bell him and problem sorted.

Oh and I didn't change anything, but would of for 0.15 gasket.

[noobi]

Thats a shame about the pre 07 thing.

Heard xxxmoto are ment to be good, but not really that close so was cheaper to pay freight than drive to xxx. Plus I did find Linton quiet a bit cheaper, but who knows.

The guy that would of emailed you would of been phil, you need to speak to Linton as he tends to be a lot more helpful. He is also the guy that told me what gaskets to use and what I need to do head wise, when I ordered a Gasket kit.

So yeah just bell him and problem sorted.

Oh and I didn't change anything, but would of for 0.15 gasket.

im pretty sure it was only models before mine, i suppose barty would have picked up if it was the same piston number for a YZ, i asked him if he could get the piston

xxxmoto is a 40min drive each way for us

yea it was phil, said they could only do jetting etc in person not via email, but re reading the emails now, he sounds like he was ok

what did you do to the head?

just have to find time to call him now, im at school during the week etc

0.3mm it is then

thanks for the help

[Rupe]

im pretty sure it was only models before mine, i suppose barty would have picked up if it was the same piston number for a YZ, i asked him if he could get the piston

xxxmoto is a 40min drive each way for us

yea it was phil, said they could only do jetting etc in person not via email, but re reading the emails now, he sounds like he was ok

what did you do to the head?

just have to find time to call him now, im at school during the week etc

0.3mm it is then

thanks for the help

Hang on, mine was a 02 ec200, yours could be different. Safe bet would be 0.3 + 0.15 if you were intending to ride tomorrow.

I used to ring after 6pm and still get through.

[noobi]

Hang on, mine was a 02 ec200, yours could be different. Safe bet would be 0.3 + 0.15 if you were intending to ride tomorrow.

I used to ring after 6pm and still get through.

i am riding tomorrow, but theres no time set for a piston and ring, the bike has got sfa compression atm like 135psi i think, and iv done alot of riding on the piston that was in it when i got it, nearly a year now
im just getting information and ideas for when i do do the piston and ring

they must work late then, or live above the shop

[barty5]

Here follow the link put in your bike info it will come up no match untill you click the single piston option which then give you two options i very much dout it will be the second as this is for a 2mm oversize so ther is no other option. I have check with prox they dont do one at all and a couple of other makers dont either you may find Athena do as they a german made.
Just remember there is only one left with supplier after that it would be a 2-3 week wait min.

[noobi]

Here follow the link put in your bike info it will come up no match untill you click the single piston option which then give you two options i very much dout it will be the second as this is for a 2mm oversize so ther is no other option. I have check with prox they dont do one at all and a couple of other makers dont either you may find Athena do as they a german made.
Just remember there is only one left with supplier after that it would be a 2-3 week wait min.

theres no link mate
2-3 weeks isnt that bad, still dont know when im gonna do it anyways

[barty5]

theres no link mate
2-3 weeks isnt that bad, still dont know when im gonna do it anyways

oops my bad here yah go.

http://www.wiseco.com/

[noobi]

oops my bad here yah go.

http://www.wiseco.com/

thanks for the link

is the one thats in stock the one thats standard size on the website? 762M05400 ?
and yes i doubt that its the oversize one, although i will only know when i pull the head off

is the difference between the GP and the non-GP pistons, that the GP one is for a nikasil bore?

you cant bore out nikasil ae? on the gasgas forums they talk about diamond hones or some sort of ball hone on them to clean the bore up. wtf?

thanks

[barty5]

thanks for the link

is the one thats in stock the one thats standard size on the website? 762M05400 ?
and yes i doubt that its the oversize one, although i will only know when i pull the head off

is the difference between the GP and the non-GP pistons, that the GP one is for a nikasil bore?

you cant bore out nikasil ae? on the gasgas forums they talk about diamond hones or some sort of ball hone on them to clean the bore up. wtf?

thanks

you can mahine them out for a sleeve but the linning is real hard and normally go through a few cutting tips to get it done hence it costs for for that type of bore to be done. I think the gp part just relates to the cr model nothing else you would find that there are other pistons for the cr other than the one listed for your bike going up in smaller sizes. And yes this one in stock is the one listed on the web site for the gp cr. Come see us tommorow large marque with KB logo orange SS VE commodore.

[noobi]

you can mahine them out for a sleeve but the linning is real hard and normally go through a few cutting tips to get it done hence it costs for for that type of bore to be done. I think the gp part just relates to the cr model nothing else you would find that there are other pistons for the cr other than the one listed for your bike going up in smaller sizes. And yes this one in stock is the one listed on the web site for the gp cr. Come see us tommorow large marque with KB logo orange SS VE commodore.

sweet as, will do
we're gonna be there real late, 9:30 or later, red rodeo and a huge blue car trailer and a red van is our camp, we'll try get as close to your tent as possible, i wanna do a kb lap lol

cya tomorrow
thanks for the help

[camchain]

Hey there noobi, I'm no reco expert so the following simply my view. It's common practice to combine 2 base gaskets to get your squish the right dimension and the small .05mm difference shouldn't be any prob unless your compression already maxed up with wrong gasket from start. Remember higher compression is more load on engine = shorter engine life. Don't assume gasket in there is correct, you really need to measure to be sure - it's easy enough to do. Measure before taking cylinder off, but if it's already off, completely clean off old gasket, put cylinder back on without gasket, nip it up and measure difference piston height/cylinder height with a vernier or feeler guages and a straight edge. When measuring make sure piston exactly at TDC, mine doesn't sit quite at TDC due to generator magnet effect, this can be hard to spot if not careful. Be extra tidy when cleaning off old gasket. I use masking tape on top of rags stuffed into case. You don't want gasket fragments getting into your bearings etc.

If your bore is looking a bit tired, get it accurately measured top to bottom and get the correct (maybe oversize) piston for correct clearance (which will be somewhere around 0.05mm). I'd be pretty certain you'll have a Nicasil bore. Not 100% sure your description Re brown marking in port but with cylinder off and cleaned up you'll see nicasil coating does continue into ports a bit (otherwise it would chip/flake at port edges. Nicasil coating looks darker, almost like a varnish. Resist any urge to 'clean up' any raggedy looking port/cylinder edges, you could very easily bugger the coating there). Also, need to be acutely aware that although the coating is extremely hard, it's only as thin as a coat of varnish so don't get me started on honing Nicasil.