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**Shreyas Rane** · 11-11-2014, 02:31 PM

Re: Random Questions regarding the RX series

@All Seniors
I opened the head,block and clutch side cover(to change gasket)
When I opened the block; the piston,block and head were in fairly good condition,rings were fine,con rod bearings didn't have play in them,only piston bearings were worn out.
Therefore changed only that bearing and assembled the engine back......
But the sound which was there in the video I posted earlier

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https://www.youtube.com/watch?v=BZ3gp-2vUL8&list=UUAdSFxVhTg-9qoSxVOPfyAA

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comes only when I push the kick lever, and in high rpm(speeds greater than 50)

I had manually spun the crank when i opened the block and the rattling sound was not there....however it comes only when kick starting.......

Are the main case bearings at fault??
Pics of block enclosed below

**Shreyas Rane** · 11-14-2014, 05:53 PM

Re: Random Questions regarding the RX series

@all seniors
Should The shifting rod have 3 pins at the end or 4 in a 4sp rx100????

**Shreyas Rane** · 11-14-2014, 06:00 PM

Re: Random Questions regarding the RX series

I am unable to attach pictures from tapatalk...therefore will upload them after the rebuild......from my computer....the rebuild should be completed by this monday...only things remaining now are...
Transmission rod pins
Clutch basket replacement
Transmission bearings change

Sent from my C6602 using Tapatalk

**Shreyas Rane** · 11-24-2014, 01:40 PM

Re: Random Questions regarding the RX series

@All
an update.....
Changed all the bearings and still the sound persists.....

I'm suspecting Piston Slap......what do you guys think???
Earlier Video(pre-rebuild)

- YouTube

https://www.youtube.com/watch?v=BZ3gp-2vUL8&list=UUAdSFxVhTg-9qoSxVOPfyAA

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

**Balgi** · 11-24-2014, 03:37 PM

Re: Random Questions regarding the RX series

Originally posted by Shreyas Rane View Post

@All
an update.....
Changed all the bearings and still the sound persists.....

I'm suspecting Piston Slap......what do you guys think???
Earlier Video(pre-rebuild)

https://www.youtube.com/watch?v=BZ3g...g-9qoSxVOPfyAA

Con-rod noise. Will be present on any refurbished crank. Will be loud on a badly refurbished crank. Change the con-rod, refurbish the crank, get a good cage bearing and voila problem solved. (just my take, others please correct me if I'm wrong)

**Shreyas Rane** · 11-24-2014, 03:59 PM

Re: Random Questions regarding the RX series

Originally posted by Balgi View Post

Con-rod noise. Will be present on any refurbished crank. Will be loud on a badly refurbished crank. Change the con-rod, refurbish the crank, get a good cage bearing and voila problem solved. (just my take, others please correct me if I'm wrong)

@Balgi
I have changed all the bearings of the Engine...
And the con rod didn't have play.....
It was checked by a trusted mech and by myself.....
AFAIK the side play (1-2 mm) is OK but it should not have vertical play right??

Con rod didn't have vertical play.......

That's why I thought about piston slapping.......

BTW which is the OEM Company of con rods for Yamaha Rx series...
Currently the one which I have in my bike is of NICO (I don't exactly remember the name....)

**Balgi** · 11-24-2014, 04:34 PM

Re: Random Questions regarding the RX series

Originally posted by Shreyas Rane View Post

@Balgi
I have changed all the bearings of the Engine...
And the con rod didn't have play.....
It was checked by a trusted mech and by myself.....
AFAIK the side play (1-2 mm) is OK but it should not have vertical play right??

Con rod didn't have vertical play.......

That's why I thought about piston slapping.......

BTW which is the OEM Company of con rods for Yamaha Rx series...
Currently the one which I have in my bike is of NICO (I don't exactly remember the name....)

The one you have is mako which is standard for the rebuild.

Vertical movement must be absent but there should also not be any horizontal play on the con-rod which can be felt when handling it. So don't know about 1-2mm play bud. Maybe other members can guide you better on that. But if the refurbishing is not done correctly, as I had mentioned before, then noise will come despite there being no play on the crank anywhere. So it doesn't matter if the con-rod is good or bearings are new, if not installed properly they will make noise.

**Shreyas Rane** · 11-24-2014, 09:57 PM

Re: Random Questions regarding the RX series

Originally posted by Balgi View Post

The one you have is mako which is standard for the rebuild.

Vertical movement must be absent but there should also not be any horizontal play on the con-rod which can be felt when handling it. So don't know about 1-2mm play bud. Maybe other members can guide you better on that. But if the refurbishing is not done correctly, as I had mentioned before, then noise will come despite there being no play on the crank anywhere. So it doesn't matter if the con-rod is good or bearings are new, if not installed properly they will make noise.

I never refurbished the crank [MENTION=72198]Balgi[/MENTION] .....
Only changed the piston pin bearing......
The down end bearing of the crank is perfectly alright....
and on many sites it is written that side play is ok...
It is even mentioned in the workshop manual

**Balgi** · 11-24-2014, 10:08 PM

Re: Random Questions regarding the RX series

Originally posted by Shreyas Rane View Post

I never refurbished the crank [MENTION=72198]Balgi[/MENTION] .....
Only changed the piston pin bearing......
The down end bearing of the crank is perfectly alright....
and on many sites it is written that side play is ok...
It is even mentioned in the workshop manual
[ATTACH=CONFIG]165018[/ATTACH]

Well I just gave you my experience from my own Rx. That's why I asked other members to help figure it out.
Anyway, good luck.

**Shreyas Rane** · 11-24-2014, 10:13 PM

Re: Random Questions regarding the RX series

Thanks Bro....
Appreciate the help.......

BTW to convert a 4sp rx100 to a 4sp rx135
block+piston+head of rx135 is a direct fit???

**SriramEfunds** · 11-24-2014, 10:19 PM

Re: Random Questions regarding the RX series

Shreyas, is your bike running on new standard bore or rebored? Its macco /maco connecting rod used crank rebuild.

**Shreyas Rane** · 11-24-2014, 10:28 PM

Re: Random Questions regarding the RX series

[MENTION=22265]SriramEfunds[/MENTION] Sir
My bike is on stock bore....
block+piston both from '92
clocked around 37k KMS on it.....
and crank was bought as a whole around 10K KMS back

**SriramEfunds** · 11-24-2014, 11:26 PM

Re: Random Questions regarding the RX series

Okay, If I were you, would do like this ....
1. While changing the crank, would have changed the rings at least.
2. I would check the clearance of piston again and even go for next size if needed.
3. While rebuilding the engine, never leave any area with old parts ie crank, bearings, piston rings oil seal etc. The reason is, as time goes by the wear out of one area might be high than the other,so you'll end up grounding the engine at regular times. That's why I always insist on complete engine rebuilt.

**Shreyas Rane** · 11-24-2014, 11:31 PM

Re: Random Questions regarding the RX series

Originally posted by SriramEfunds View Post

Okay, If I were you, would do like this ....
1. While changing the crank, would have changed the rings at least.
2. I would check the clearance of piston again and even go for next size if needed.
3. While rebuilding the engine, never leave any area with old parts ie crank, bearings, piston rings oil seal etc. The reason is, as time goes by the wear out of one area might be high than the other,so you'll end up grounding the engine at regular times. That's why I always insist on complete engine rebuilt.

Ok.... [MENTION=22265]SriramEfunds[/MENTION] sir...
I'll change the piston and rings and the cylinder too....
btw will the 135's will be a direct fit??

Sent from my Xperia Z using xBhp Connect mobile app

**Shreyas Rane** · 11-26-2014, 06:39 PM

Re: Random Questions regarding the RX series

[MENTION=22265]SriramEfunds[/MENTION] Sir [MENTION=72198]Balgi[/MENTION]
I checked the piston today......
After opening the head,I checked whether the piston moves horizontal....
And as I suspected it has a little horizontal movement.....
The bore is in a fairly good condition so will change the piston along with rings and will get the cylinder honed for the new piston....
Any suggestions will be greatly appreciated

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