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Author Topic: Couple questions  (Read 241 times)

mrcrum

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Couple questions
« on: August 15, 2017, 11:59:44 PM »

Hi guys.  New member. My son bought a used GV250 for his 1st bike and I've never owned one but am pretty knowledgeable mechanically and electronically.  We've had consistent problems with the carb but our latest issue is that it had low compression so we installed new pistons.  The manual says that the bolt torque for the Head bolts is 15 - 20 nm.  This seems pretty low to me so I looked up other Hyosung bike models, like the comet, and they all say 45nm.  Is this a typo or is it really that low?  Also, since we have been having a hard time keeping the carbs working well I counted the turns of what Hyosung seems to call the CO screws, which seem to be the idle mixture screws, and the front carb is set to one full turn and the rear carb is set to two and a half turns.  This seems to be a lot of difference.  I know they say not to change these settings but does that seem like it could be right to you guys? Also what does CO stand for?  Thanks for any help you can give us.  Thanks!!



****Update****
It appears that there are different revisions to the Aquila manual.  One of them appears to have a typo for the head bolt torques.  It said Aquila GV250 as the file name but only says Aquila on the title page.  May not be for the 250 at all?
Part # 99000-95210 says:

Cylinder head base nut
: 15~20 N∙m(1.5~2.0 kg∙m)

Cylinder head bolt
: 7~11 N∙m(0.7~1.1 kg∙m)

umop-ǝpisdn posted a link to http://hyosung.hu/download/pdf/letoltesek.htm. 
It had a part # 99000-95310 manual on it.

Cylinder head base nut
: 7~11 N∙m(0.7~1.1 kg∙m)

Cylinder head bolt
: 21~25 N∙m(2.1~2.5 kg∙m)

The reason its lower than I would have thought and lower than the other models I looked at is that it uses 6mm bolts compared to 10mm on some other models.

Also, I adjusted the idle screws figuring I could put them back to what they were if I had issues and the rear was right on at 2 1/2 turns and the front was still low at 1 1/2 turns compared to 1 turn it was set at but now it starts easily and runs real smooth.  No more issues.
CO stands for coil, as in coil spring and coil spring adjuster.  Lost in translation.

« Last Edit: September 14, 2017, 11:29:54 PM by mrcrum »
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umop-ǝpisdn

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Re: Couple questions
« Reply #1 on: September 14, 2017, 09:27:51 PM »

No idea  :(

Max of 11Nm for a head bolt though? Not a chance! ..that has to be wrong. Base nut maybe, but no way that's right for a head bolt.
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

Christmas

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Re: Couple questions
« Reply #2 on: September 14, 2017, 10:23:19 PM »

I dunno.. when I replaced the head on my old kawa i had to buy a new torque wrench because mine didnt go low enough, they were only 7nm..
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mrcrum

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Re: Couple questions
« Reply #3 on: September 15, 2017, 12:06:04 AM »

I think I figured it out.  See ***Update*** in original post.  The 1st manual I had was an old revision and appears to have a typo.
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umop-ǝpisdn

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Re: Couple questions
« Reply #4 on: September 15, 2017, 12:59:16 AM »

I'm pretty sure I have an even newer version in a secret stash at home. I doubt it will be very different though.
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

Hylife

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Re: Couple questions
« Reply #5 on: September 20, 2017, 11:22:05 AM »

Manual numbers 99000-95210 and 99000-95310 is for mechanicals.
(both state
Cylinder head base nut : 7~11 N (0.7~1.1 kg∙m)

Cylinder head bolt : 21~25 N (2.1~2.5 kg∙m)

Manual numbers 99000-95610 and 99000-95620 is for the electrical system of EFI models (95620 = USA)

PS: 10 Newtons per Meter is almost exactly (not quite) 1 kilogram per meter (10 N-m = 1.0197162129779282 kg-m) so just shift the decimal point to the left or right if your torque wrench reads as one or the other.
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