Engine help please!

bikehelp · 04-16-2018, 01:14 AM

I took the front head of my bike to clean, clean cam and adjust valves. Now my bike sounds like this.

Did i break it?

https://streamable.com/s/5uk3l/xkwypf

bikehelp · 04-16-2018, 12:43 PM

Can anyone help? Is timing off?

franque · 04-16-2018, 01:20 PM

It sounds like there is either a vacuum leak somewhere, or a breather hose is unplugged. Do you feel any inordinate puffs of air anywhere? Also, you put a new exhaust gasket on it, yes?

bikehelp · 04-16-2018, 02:05 PM

Quote:

Originally Posted by franque

It sounds like there is either a vacuum leak somewhere, or a breather hose is unplugged. Do you feel any inordinate puffs of air anywhere? Also, you put a new exhaust gasket on it, yes?

A gasket were the exhaust pipe connects? I used the original, well there wasn't really one it was pretty shredded look worse then these.

bikehelp · 04-16-2018, 02:47 PM

I think its my intake. One of the top bolt that hold on the intake pipe was recently retapped. I sprayed carb starter on the spot and the RPM jumped up.

Can i use some high temp silicone to seal it?

ben2go · 04-16-2018, 02:52 PM

You'll need to replace those parts. Silicone getting into the engine will be bad.

bikehelp · 04-16-2018, 03:05 PM

Ok then, If it is confirmed the leak is do to the retapped intake bolt on the Cylinder Head. The only way is to replace the Cylinder Head Assembly?

and if so how do you measure valves to determine head size? 52.4mm or 54mm cylinder head

ben2go · 04-16-2018, 03:10 PM

Quote:

Originally Posted by bikehelp

Ok then, If it is confirmed the leak is do to the retapped intake bolt on the Cylinder Head. The only way is to replace the Cylinder Head Assembly?

and if so how do you measure valves to determine head size? 52.4mm or 54mm cylinder head

You can repair it with a helicoil kit or a time-sert kit that fits the thread size of the bolt that came out. You will need a small drill for the job and red high heat loctite. There are vids on youtube explaining how to do it.

bikehelp · 04-16-2018, 03:13 PM

Quote:

Originally Posted by ben2go

You can repair it with a helicoil kit or a time-sert kit that fits the thread size of the bolt that came out. You will need a small drill for the job and red high heat loctite. There are vids on youtube explaining how to do it.

I was thinking about helicoil repair on it, should of done that instead just trying to retap, but if i do just get a new head would this work? Looks the same, not sure?

https://www.ebay.com/i/232101248895?chn=ps

ben2go · 04-16-2018, 03:24 PM

Yes, if it's the same and for the same diameter cylinder. The valve size should be the same if it matches the cylinder size. You may need to measure your cylinder's inside bore to be sure.

Bruce's · 04-16-2018, 04:16 PM

It’s probably not leaking because of the threads as long as they are solid ,it’s more than likely the intake is cracked ,or the gasket is not sealing properly

bikehelp · 04-16-2018, 07:50 PM

Quote:

Originally Posted by Bruce's

It’s probably not leaking because of the threads as long as they are solid ,it’s more than likely the intake is cracked ,or the gasket is not sealing properly

No it's not cracked, Its this bolt, I covered the area with my figure and the noise stops.
So i just put a little black high temp silicon around that bolt gap. Will see tomorrow.

Bruce's · 04-16-2018, 08:38 PM

it Looks like there is a gap between the bolt head and the intake ,try a washer or two in there to take up that gap .Also ,you may try a thicker gasket or oring depending on what it has .

Hellkitty · 04-16-2018, 08:41 PM

That looks like a 125cc engine found on Taotao products. Probably a 54x54 square bore. Is that a Taotao Hellcat?

lonfu · 04-16-2018, 08:53 PM

Looks like your bolt is cross threaded. I would pull it and re- thread the hole to see if you can save it with out a heli-coil.

04-16-2018, 01:14 AM	#1
bikehelp Join Date: Apr 2018 Posts: 7	Engine help please! I took the front head of my bike to clean, clean cam and adjust valves. Now my bike sounds like this. Did i break it? https://streamable.com/s/5uk3l/xkwypf
	0

04-16-2018, 08:53 PM	#15
lonfu Join Date: Feb 2008 Location: kingman az Posts: 34	Looks like your bolt is cross threaded. I would pull it and re- thread the hole to see if you can save it with out a heli-coil. __________________ 2007 4x4 300 buyang atv <br />2009 4x4 300 Buyang atv<br />1985 yamaha v-max/2009 fuel inj Yamaha Rhino
	2

04-16-2018, 12:43 PM	#2
bikehelp Join Date: Apr 2018 Posts: 7	Can anyone help? Is timing off?
	0

04-16-2018, 01:20 PM	#3
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	It sounds like there is either a vacuum leak somewhere, or a breather hose is unplugged. Do you feel any inordinate puffs of air anywhere? Also, you put a new exhaust gasket on it, yes?
	0

04-16-2018, 02:47 PM	#5
bikehelp Join Date: Apr 2018 Posts: 7	I think its my intake. One of the top bolt that hold on the intake pipe was recently retapped. I sprayed carb starter on the spot and the RPM jumped up. Can i use some high temp silicone to seal it?
	0

04-16-2018, 02:52 PM	#6
ben2go Join Date: Jun 2011 Posts: 1,335	You'll need to replace those parts. Silicone getting into the engine will be bad.
	0

04-16-2018, 03:05 PM	#7
bikehelp Join Date: Apr 2018 Posts: 7	Ok then, If it is confirmed the leak is do to the retapped intake bolt on the Cylinder Head. The only way is to replace the Cylinder Head Assembly? and if so how do you measure valves to determine head size? 52.4mm or 54mm cylinder head
	0

04-16-2018, 03:24 PM	#10
ben2go Join Date: Jun 2011 Posts: 1,335	Yes, if it's the same and for the same diameter cylinder. The valve size should be the same if it matches the cylinder size. You may need to measure your cylinder's inside bore to be sure.
	0

04-16-2018, 04:16 PM	#11
Bruce's Join Date: Apr 2015 Location: Sudbury ,Ontario Posts: 855	It’s probably not leaking because of the threads as long as they are solid ,it’s more than likely the intake is cracked ,or the gasket is not sealing properly
	0

04-16-2018, 08:38 PM	#13
Bruce's Join Date: Apr 2015 Location: Sudbury ,Ontario Posts: 855	it Looks like there is a gap between the bolt head and the intake ,try a washer or two in there to take up that gap .Also ,you may try a thicker gasket or oring depending on what it has .
	0

04-16-2018, 08:41 PM	#14
Hellkitty Join Date: Dec 2017 Posts: 216	That looks like a 125cc engine found on Taotao products. Probably a 54x54 square bore. Is that a Taotao Hellcat?
	0