Hawk Muffler issue

kd2dxf · 07-26-2016, 05:27 PM

This is about the 3rd time I have lost one or both bolts off the engine exhaust manifold. I plan on getting grade 8 lock nuts this time. However I cant remember what size Nut/Bolt for the Exhaust flange. Looks like a 10MM?

pcspecialist · 07-26-2016, 07:48 PM

Double nut it

kd2dxf · 07-26-2016, 08:26 PM

I ended up putting split lock washers with lock nuts. Hopefully that will fix it

hertz9753 · 07-26-2016, 08:55 PM

I use stainless flat and lock washers on my exhaust header.

Ariel Red Hunter · 07-27-2016, 11:47 AM

Quote:

Originally Posted by kd2dxf

This is about the 3rd time I have lost one or both bolts off the engine exhaust manifold. I plan on getting grade 8 lock nuts this time. However I cant remember what size Nut/Bolt for the Exhaust flange. Looks like a 10MM?

Most lock nuts have nylon locks. They can't take the heat of an exhaust head pipe. Either double nut them or safety wire them.

kd2dxf · 07-27-2016, 02:33 PM

Anyone know why I would feel grinding/vibration when decelerating? dont know any other way to describe it. I tightened the chain thinking it was that, but I still feel it. maybe time for new sprockets?

kd2dxf · 07-27-2016, 03:21 PM

So I took a look at the chain, and sprockets. brand new DID HD Chain. sprockets have no/little wear.
Ill also point out that when i pull in the clutch and coast, the grinding feeling goes away

pete · 07-28-2016, 01:56 AM

Quote:

Originally Posted by Ariel Red Hunter

Most lock nuts have nylon locks. They can't take the heat of an exhaust head pipe. Either double nut them or safety wire them.

most common garden type are .. but not all.....

use cone lock nuts... no nylon insert.....

exhaust nuts are usaly 8x1.25mm

07-26-2016, 05:27 PM	#1
kd2dxf Join Date: May 2016 Location: Central New York Posts: 32	Hawk Muffler issue This is about the 3rd time I have lost one or both bolts off the engine exhaust manifold. I plan on getting grade 8 lock nuts this time. However I cant remember what size Nut/Bolt for the Exhaust flange. Looks like a 10MM?
	0

07-26-2016, 08:55 PM	#4
hertz9753 Join Date: May 2016 Location: Bismarck, ND Posts: 868	I use stainless flat and lock washers on my exhaust header. __________________ 2015 and 3/4 RPS Hawk 250. Most people would call it a 2016 but the MCO didn't.
	0

07-27-2016, 03:21 PM	#7
kd2dxf Join Date: May 2016 Location: Central New York Posts: 32	new grinding issue So I took a look at the chain, and sprockets. brand new DID HD Chain. sprockets have no/little wear. Ill also point out that when i pull in the clutch and coast, the grinding feeling goes away
	0

07-26-2016, 07:48 PM	#2
pcspecialist Join Date: May 2016 Posts: 583	Double nut it
	0

07-26-2016, 08:26 PM	#3
kd2dxf Join Date: May 2016 Location: Central New York Posts: 32	I ended up putting split lock washers with lock nuts. Hopefully that will fix it
	0

07-27-2016, 02:33 PM	#6
kd2dxf Join Date: May 2016 Location: Central New York Posts: 32	Anyone know why I would feel grinding/vibration when decelerating? dont know any other way to describe it. I tightened the chain thinking it was that, but I still feel it. maybe time for new sprockets?
	0