Top end gasket kit

[poelinca]

Can you guys confirm that the kit comes with two cylinder base gaskets ? Kit reference is ME94620CT-CAB-1 for 2014 model.

The kit (bag holding the gaskets) came opened with only one base gasket, while the bike had two installed. I'm about to put it all back together and not sure if i should use the old gaskets or the only one that came with the kit.

It's been a month since i rode the bike, i'm loosing patience with all these orders for tools and parts.

 

[hadfield4wd]

Yes it does. Different thicknesses

 

[poelinca]

Yes it does. Different thicknesses

Ok so that means i can't put the cylinder back on, awesome.

Thanks for the quick reply.

 

[hadfield4wd]

Why not. Pick the right thicknesa

 

[poelinca]

I only received one gasket, not two. I can't but only pick the two old ones, or wait another two weeks for a new kit/gasket.

 

[davidof]

I just bought one of those kits to my 2014 replica and there was only one base gasket in It.

 

[cbutler]

Do you know what your squish was?

If not I would put the one gasket you have on and check it. Then ride

 

[poelinca]

I just bought one of those kits to my 2014 replica and there was only one base gasket in It.

So what did you do ?

Do you know what your squish was?

If not I would put the one gasket you have on and check it. Then ride

I don't know what it was, and to be honest i really don't want to mess with it at the moment. Squish is a mod that i'll do at a later point, for my skill it shouldn't make any difference if i have the "perfect" squish set or not. The bike is plenty enough for me as it was, and to get the head machined now it will set me back another 2 weeks at least + i do not have the skills to properly jet the bike after. Plus messing with the squish also means messing with the timings and compression, and if you don't get that right you can be in a world of trouble. Even if you get it right, you still have to be careful what fuel you put in, etc. ... i don't race and as i said my riding skills will not notice the difference.

How about i go and use the old gaskets ? They were in pretty good shape.

 

[GGRider01]

If there are no tears, I don't see why you couldn't.

 

[poelinca]

If there are no tears, I don't see why you couldn't.

What would be the symptoms to look out for if they don't seal properly ?

They looked very close to new, i only had to scratch a very small amount from the cylinder (and by that i mean at the screws that hold the cylinder on the crankcase there were small dots like ground pepper that came off with my finger nail).

 

[GGRider01]

Oh man.. Burning coolant. Losing coolant to the outside of the motor. Air leaks leading to a lean condition. Generally stuff you don't want to risk.

I'd say use the one gasket and measure squish. Run it if it gives a safe measurement.

 

[cbutler]

Yep do not reuse the old stuff.

Just put the single in and ride you wont even know the difference

 

[jostby]

Originally there were 3 gaskets available and the last kit I bought came with all of them. GG used them in different combinations, some had 1, others had 2. Don't know of any that just used the 1 thinnest. Without researching I think they were.003", .008" and .015" or something close. Most folks probably wouldn't notice a difference. Thinnest one wasn't used by itself because it isn't thick enough to seal well and sealant will add approximately another. 003". Disclaimer.... this all off the top of my failing memory

 

[hadfield4wd]

Don't reuse the old gasket. And on base gaskets I use copper spray.

 

[cbutler]

Originally there were 3 gaskets available and the last kit I bought came with all of them. GG used them in different combinations, some had 1, others had 2. Don't know of any that just used the 1 thinnest. Without researching I think they were.003", .008" and .015" or something close. Most folks probably wouldn't notice a difference. Thinnest one wasn't used by itself because it isn't thick enough to seal well and sealant will add approximately another. 003". Disclaimer.... this all off the top of my failing memory

All my bikes I have the thinnest in 01 TXT 280, 02 EC 200, 03 MC250

01 and 02 squish is spot on 03 never checked but runes like a raped ape

 

[Moto7man]

Also, install the base gasket, piston and cylinder. Then put your piston at BDC,look down the barrel and check the top of your piston in relation to the exhaust port. I did a thread on how to build a leak down tester when I did pre race season rebuild on my gasser, it's on the forum.

 

[poelinca]

I'll check the squish tonight, hopefully i'm in spec with the new gasket so i can ride this weekend. What should have been a "simple" top end job turned out into a month of frustration and i'm nowhere near to finish it.

 

[barossi73]

Measure your old gasket combo thickness with calipers first and compare to new.if u are lucky the replacement may be thicker and be close,otherwise order what you need.i have reused base gaskets in the past with no problem(only if in good cond) but it makes more sense to replace with new due to the effort/time req to replace.

 

[Jakobi]

Measure your old gasket combo thickness with calipers first and compare to new.if u are lucky the replacement may be thicker and be close,otherwise order what you need.i have reused base gaskets in the past with no problem(only if in good cond) but it makes more sense to replace with new due to the effort/time req to replace.

This

Measure the new gasket, measure the existing stack. Compare results.
Install new gasket and compare piston edge to bottom of exhaust port at bottom dead center. If it sits flush to around .5mm above the port floor you'll be OK!
Spend the couple minutes to rip a squish clearance on assembly of the head. Odds are in favour of the clearance still being huge and not risking piston to head contact or excessive compression ratios.

 

[poelinca]

This

Measure the new gasket, measure the existing stack. Compare results.
Install new gasket and compare piston edge to bottom of exhaust port at bottom dead center. If it sits flush to around .5mm above the port floor you'll be OK!
Spend the couple minutes to rip a squish clearance on assembly of the head. Odds are in favour of the clearance still being huge and not risking piston to head contact or excessive compression ratios.

Squish measured at 2.14mm, piston stays right above the port floor but can't really measure it out. Tomorrow is test drive and jetting with the new piston, hope everything is ok.