Well, she finally puked her guts out.... (pic) - Page 5

Vegas Street Rider · 03-19-2017, 05:43 PM

Thinking positive thoughts for your GZ.

spldart · 03-19-2017, 06:55 PM

Quote:

Originally Posted by Vegas Street Rider

Thinking positive thoughts for your GZ.

Thank you.

And thank all you guys for dealing with my ranting and raving

As a humorous aside.
The 7 mm socket I bought especially to remove the cover from the sprocket came in handy twice more just TODAY.

Room mates Crown Vic needed a spark plug replaced. Coil bolt... 7 mm.

Room mates Murray lawn mower wouldn't start. Carb to filter plate... 7 mm.

Didn't have a 7 mm. Needed for the bike. Bought. Now used on multiple motors.

Water Warrior 2 · 03-20-2017, 01:16 AM

You can never have enough tools.

wacio · 03-20-2017, 09:17 PM

Put that old piston on the scale and write the weight down somewhere. Next time you tear the lump down you can compare the new one to the old one. Maybe you'll be able to get the new one to the right weight.

spldart · 03-20-2017, 11:38 PM

So... Breaking in the rings....
This motor is so tight I had to crank the idle near max...
It got massively hot on the way in to work this morning and had me worried....

Heading home, however, it sounded much better and I had to turn the idle down
twice. *tight motor loosening up*
Stayed at and below 4500 rpm on the way home.
A lot less heat and noise.

I have to admit I have never had a fresh motor so tight and run so hot even though it spec'd out properly.

No oil consumption, no smoke.

Starts easily.

Oh!!!! And another solution to the deck height problem could be multiple base gaskets for the cylinder!

spldart · 03-20-2017, 11:44 PM

Quote:

Originally Posted by wacio

Put that old piston on the scale and write the weight down somewhere. Next time you tear the lump down you can compare the new one to the old one. Maybe you'll be able to get the new one to the right weight.

If I had the scale handy I would have prolly posted the weight of every individual piece cuz I'm

like that.

Anywho... Now i'm wondering if it was head shaking as much as it was this morning cuz it was gulping so much more A/F just to maintain idle than it normally needed.
This evening felt much more normal. * backed off idle screw substantially *

60 + miles on new rings/piston/cylinder

Tomorrow is another day

spldart · 03-20-2017, 11:47 PM

Not quite the normal rebuild issues I'm used to though it smells JUST like a brand new motor.
I missed that smell

Water Warrior 2 · 03-21-2017, 05:03 PM

That new smell and no new sounds. Sounds like you finally nailed it down.

I am impressed with the close tolerances you found and rectified. The other point that has come up in the past is whether the GN250 parts list will work. Now we know the parts are interchangable.

Now get out there and enjoy the ride.

spldart · 03-21-2017, 10:14 PM

Interchangeable but not quite a bolt in.

Already know 2 layers of the old gasket had to be sammiched with new gasket to gain deck clearance.
If I had to do again I'd get a second generic base gasket and sammich that to be sure.

Report after second 50 mile commute....
Engine feels almost as good as new. Rings still seating. Idle screw set almost exactly stock now.
Valve lash noise but to be expected. As everything seats in I'll need to reset valve clearances.
Next weekend I'd imagine.
I'm now allowing motor to rev out for short bursts to 5000 rpm with a bit over 100 miles on it.
No smoke, no leakage and no oil consumption.

spldart · 03-21-2017, 10:19 PM

Chinese GN250 head is WELL over 300 bux.
Not sure I'd bother to replace that or just consider bike disposable if that crack opens up. Hrm...
If I do the head too you can be sure it will get documented here :thumbsup:

03-19-2017, 05:43 PM	#41
Vegas Street Rider Senior Member Join Date: May 2015 Location: Henderson, NV Posts: 1,108	Thinking positive thoughts for your GZ. Login or Register to Remove Ads
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03-20-2017, 01:16 AM	#43
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	You can never have enough tools. Login or Register to Remove Ads
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03-20-2017, 11:38 PM	#45
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	So... Breaking in the rings.... This motor is so tight I had to crank the idle near max... It got massively hot on the way in to work this morning and had me worried.... Heading home, however, it sounded much better and I had to turn the idle down twice. tight motor loosening up Stayed at and below 4500 rpm on the way home. A lot less heat and noise. I have to admit I have never had a fresh motor so tight and run so hot even though it spec'd out properly. No oil consumption, no smoke. Starts easily. Oh!!!! And another solution to the deck height problem could be multiple base gaskets for the cylinder! Login or Register to Remove Ads
	0

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03-20-2017, 09:17 PM	#44
wacio Senior Member Join Date: Apr 2016 Location: Illinois Posts: 174	Put that old piston on the scale and write the weight down somewhere. Next time you tear the lump down you can compare the new one to the old one. Maybe you'll be able to get the new one to the right weight.
	0

03-20-2017, 11:47 PM	#47
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	Not quite the normal rebuild issues I'm used to though it smells JUST like a brand new motor. I missed that smell
	0

03-21-2017, 05:03 PM	#48
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	That new smell and no new sounds. Sounds like you finally nailed it down. I am impressed with the close tolerances you found and rectified. The other point that has come up in the past is whether the GN250 parts list will work. Now we know the parts are interchangable. Now get out there and enjoy the ride.
	0

03-21-2017, 10:14 PM	#49
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	Interchangeable but not quite a bolt in. Already know 2 layers of the old gasket had to be sammiched with new gasket to gain deck clearance. If I had to do again I'd get a second generic base gasket and sammich that to be sure. Report after second 50 mile commute.... Engine feels almost as good as new. Rings still seating. Idle screw set almost exactly stock now. Valve lash noise but to be expected. As everything seats in I'll need to reset valve clearances. Next weekend I'd imagine. I'm now allowing motor to rev out for short bursts to 5000 rpm with a bit over 100 miles on it. No smoke, no leakage and no oil consumption.
	0

03-21-2017, 10:19 PM	#50
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	Chinese GN250 head is WELL over 300 bux. Not sure I'd bother to replace that or just consider bike disposable if that crack opens up. Hrm... If I do the head too you can be sure it will get documented here :thumbsup:
	0