Stripped head bolt studs

[OrionSphere]

I bought a bikeberry 48cc kit 2-3 years ago and have had it running off/on.

Recently I noticed that my head area is leaking alot of oil and compression is sucky. One of the head bolts is stripped. I don't know exactly what size I need.

Does anyone know, for sure, exactly what size bolt I need to replace it? Hopefully I can order the replacement on Amazon before I get home and won't have to open it up and measure. I'm riding my bike until I get it fixed.

It should look like this so everyone knows what I'm speaking of.

 

[robe]

Looks right at 8 mm. Chances are you stripped the aluminum threads in the block. Probably have to install a helicoil thread repair like this.
https://www.amazon.ca/Wolfride-Heli...o&dib_tag=se&keywords=8mm+helicoil+kit&sr=8-5

Search this site, many people have had this issue.

 

[OrionSphere]

Looks right at 8 mm. Chances are you stripped the aluminum threads in the block. Probably have to install a helicoil thread repair like this.
https://www.amazon.ca/Wolfride-Heli...o&dib_tag=se&keywords=8mm+helicoil+kit&sr=8-5

Search this site, many people have had this issue.

I have searched the site. I'm pretty sure it's a stripped bolt, not stripped threads in the block

 

[Chainlube]

48cc will have a 6mm head stud. Easy enough to tell, put a ruler across the shaft, if it looks like 1/4", then it's 6mm.

 

[Wrench]

I have searched the site. I'm pretty sure it's a stripped bolt, not stripped threads in the block

I know your hopeful it's just the bolt threads are stripped so it's an easy fix but...
100% of the time the aluminum threads in the case will pull out (strip) before a steel bolt/stud threads will strip
Helicoil thread insert will repair the case threads

 

[DAMIEN1307]

I bought a bikeberry 48cc kit 2-3 years ago and have had it running off/on.

Recently I noticed that my head area is leaking alot of oil and compression is sucky. One of the head bolts is stripped. I don't know exactly what size I need.

Does anyone know, for sure, exactly what size bolt I need to replace it? Hopefully I can order the replacement on Amazon before I get home and won't have to open it up and measure. I'm riding my bike until I get it fixed.

It should look like this so everyone knows what I'm speaking of.

This is the helicoil repair kit for the 48cc you will need for the M6 x 1.0 needed to repair the damaged threading on those stripped holes in the block... @robe and @Wrench are both probably correct when they are telling you the threads are stripped out rather than the stud being stripped.

I had the same problem with my M8 x 1.25 on my V-2 Phantom 85 and I had originally thought it was the stud until I pulled it apart and saw the threads in the hole come out with the stud, and the stud itself was perfectly fine.

https://www.amazon.com/BILITOOLS-M6...B09WN4XSVV/ref=pd_ci_mcx_pspc_dp_d_2_i_1?th=1

 

[DAMIEN1307]

I'm riding my bike until I get it fixed.

Let me know how that one works out for ya...lol...lol...You will break it much worse than what it is already.

If you keep riding it like that where it keeps sucking in air, doesn't lubricate properly and overheats, and is riding lean you will fry that motor and turn it into either a boat anchor or 26 pound paperweight...Your choice...lol.

Fix it BEFORE you run it to avoid further damage.

 

[OrionSphere]

This is the helicoil repair kit for the 48cc you will need for the M6 x 1.0 needed to repair the damaged threading on those stripped holes in the block... @robe and @Wrench are both probably correct when they are telling you the threads are stripped out rather than the stud being stripped.

I had the same problem with my M8 x 1.25 on my V-2 Phantom 85 and I had originally thought it was the stud until I pulled it apart and saw the threads in the hole come out with the stud, and the stud itself was perfectly fine.

https://www.amazon.com/BILITOOLS-M6...B09WN4XSVV/ref=pd_ci_mcx_pspc_dp_d_2_i_1?th=1

Y'all are right lol, I checked and threads are stripped out of the case. I need to wait for helicoil to arrive but I will ride it until then

 

[OrionSphere]

I know your hopeful it's just the bolt threads are stripped so it's an easy fix but...
100% of the time the aluminum threads in the case will pull out (strip) before a steel bolt/stud threads will strip
Helicoil thread insert will repair the case threads

, you're right

 

[DieselTech]

You are going to need more than a heli-coil kit. You will also need a head gasket & a base gasket, a exhaust gasket, & a intake gasket.