21 TBR7 Valve/adjuster missing

Msimkonis · 02-17-2023, 04:04 PM

Hi I have a 2021 TBR7 carbed bike

I had extremely low power from my bike, pulled the valve cover to adjust valves, and exhaust valve seems to be missing, what would next step be?
Do i need a whole new head?
Should I tear it apart and re seat everything?
I attached two pics showing whats missing

TominMO · 02-17-2023, 04:11 PM

You are missing the exhaust valve's adjuster screw and locknut. Look around in there and see if it just backed itself out due to vibration, i.e. the nut was not tightened down.

Bill Hilly · 02-17-2023, 04:16 PM

Your valve is not missing, but the set screw, and it's lock nut are. Take a light, and look all around the top of the motor, behind the springs, or maybe even inside a coil, check all crevices, and hopefully you can find them. They may be together, or separated . If you don't find it/ them maybe you can get lucky, and the oil screen might have held them, maybe the wil drain out with the oil.

Bill Hilly · 02-17-2023, 04:19 PM

Quote:

Originally Posted by TominMO

You are missing the exhaust valve's adjuster screw and locknut. Look around in there and see if it just backed itself out due to vibration, i.e. the nut was not tightened down.

Sorry, I basically repeated what you said, I must have been typing at the same time.

severely · 02-17-2023, 04:41 PM

Quote:

Originally Posted by Msimkonis

Hi I have a 2021 TBR7 carbed bike

I had extremely low power from my bike, pulled the valve cover to adjust valves, and exhaust valve seems to be missing, what would next step be?
Do i need a whole new head?
Should I tear it apart and re seat everything?
I attached two pics showing whats missing

What Tom and Bill said. Use a small flexible magnet to fish around the pushrod area and the rest of the valve area to try to find the adjustor/nut. Good luck.

Megadan · 02-17-2023, 06:51 PM

If those made it to the crankcase without getting caught by the cam gear set, you got insanely lucky. Hopefully they are just sitting in one of the little nooks of the top of the head.

To give yourself more visibility, I would remove the rocker box as this will give you a full view of the top of the head, and hopefully they are just sitting underneath it. It is held on by 3 bolts - one is in your first picture, furthest to the right. One in the middle, and one on the opposite side of the first one. Make sure to set the engine to TDC on the compression stroke if it isn't there already before doing so.

XLsior · 02-17-2023, 07:05 PM

yeah you need to find that set screw and lock nut...

Kinda scary and yet impressive the bike still ran...

02-17-2023, 04:04 PM	#1
Msimkonis Join Date: Aug 2022 Posts: 4	21 TBR7 Valve/adjuster missing Hi I have a 2021 TBR7 carbed bike I had extremely low power from my bike, pulled the valve cover to adjust valves, and exhaust valve seems to be missing, what would next step be? Do i need a whole new head? Should I tear it apart and re seat everything? I attached two pics showing whats missing Attached Thumbnails
	0

02-17-2023, 04:11 PM	#2
TominMO Join Date: Sep 2021 Location: De Soto, MO Posts: 1,871	You are missing the exhaust valve's adjuster screw and locknut. Look around in there and see if it just backed itself out due to vibration, i.e. the nut was not tightened down. __________________ 2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself
	2

02-17-2023, 06:51 PM	#6
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,016	If those made it to the crankcase without getting caught by the cam gear set, you got insanely lucky. Hopefully they are just sitting in one of the little nooks of the top of the head. To give yourself more visibility, I would remove the rocker box as this will give you a full view of the top of the head, and hopefully they are just sitting underneath it. It is held on by 3 bolts - one is in your first picture, furthest to the right. One in the middle, and one on the opposite side of the first one. Make sure to set the engine to TDC on the compression stroke if it isn't there already before doing so. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

02-17-2023, 04:16 PM	#3
Bill Hilly Join Date: Feb 2021 Posts: 934	Your valve is not missing, but the set screw, and it's lock nut are. Take a light, and look all around the top of the motor, behind the springs, or maybe even inside a coil, check all crevices, and hopefully you can find them. They may be together, or separated . If you don't find it/ them maybe you can get lucky, and the oil screen might have held them, maybe the wil drain out with the oil.
	0

02-17-2023, 07:05 PM	#7
XLsior Join Date: Aug 2020 Location: Australia Posts: 1,289	yeah you need to find that set screw and lock nut... Kinda scary and yet impressive the bike still ran...
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