Oil leak behind ac generator

[Nicko]

Hello and thanks for all your help so far.

I have almost got my rebuilt Tx 650 (447 engine) running well, however the seal behind the generator since the rebuild has always leaked a small amount of oil, I have changed the oil seal 3 times even fitted a tighter 24mm in the hope this might help. I am running a yambits reed valve breather and all other seals are tight.

I had the crank rebuilt by Chris Appleby engineering last year as the rods needed changing( avoid this company do not use they are a nightmare and swindled money out of me, if anyone is interested I can give more details), because of this I had the crank checked by a Newcastle company and it was slightly out so they realigned it.

After 3 seal changes I decided to check the run out on the shaft, I could not fit the dial gauge on the seal area but assumed run out would be greater anyway as it’s further from the bearing, please see attached pictures( could not attach video)in my humble opinion it is only minimal, can anyone please advise what they think and a possible solution.

Regards Nick

 

[Its been a long time]

Hello and thanks for all your help so far.

I have almost got my rebuilt Tx 650 (447 engine) running well, however the seal behind the generator since the rebuild has always leaked a small amount of oil, I have changed the oil seal 3 times even fitted a tighter 24mm in the hope this might help. I am running a yambits reed valve breather and all other seals are tight.

I had the crank rebuilt by Chris Appleby engineering last year as the rods needed changing( avoid this company do not use they are a nightmare and swindled money out of me, if anyone is interested I can give more details), because of this I had the crank checked by a Newcastle company and it was slightly out so they realigned it.

After 3 seal changes I decided to check the run out on the shaft, I could not fit the dial gauge on the seal area but assumed run out would be greater anyway as it’s further from the bearing, please see attached pictures( could not attach video)in my humble opinion it is only minimal, can anyone please advise what they think and a possible solution.

Regards Nick

Seems to me you have around 3x the permitted runout from the Yamaha shop manual. Sorry, that's not what you wanted to hear. Others more knowledgeable about the 650 engine may have something to say too. Screenshot below -

 

[Nicko]

Thanks for your reply, since receiving I have been still riding the bike and at the same time pondering what to do about it. The bike has only done 1000 mls since full restoration and rides good.
Due to the excessive run out it looks like I am going to have to pull the engine out again, due to all the problems I had with Chris Applebee with getting the crank rebuilt( obviously badly done as well) I am wondering if anyone can recommend someone good. I have been talking to smedspeed, who seem very knowledgeable and at the moment will probably use them.
Also I was thinking as I am pulling the engine again and it is burning a slight amount of oil(no smoke) I was going to go with the xs performance 750 kit either from smedspeed or xs650 shop in Germany.
Any advice would be welcome
Regards Nick

 

[Its been a long time]

Thanks for your reply, since receiving I have been still riding the bike and at the same time pondering what to do about it. The bike has only done 1000 mls since full restoration and rides good.
Due to the excessive run out it looks like I am going to have to pull the engine out again, due to all the problems I had with Chris Applebee with getting the crank rebuilt( obviously badly done as well) I am wondering if anyone can recommend someone good. I have been talking to smedspeed, who seem very knowledgeable and at the moment will probably use them.
Also I was thinking as I am pulling the engine again and it is burning a slight amount of oil(no smoke) I was going to go with the xs performance 750 kit either from smedspeed or xs650 shop in Germany.
Any advice would be welcome
Regards Nick

I can't recommend anyone for you I'm afraid. I would make absolutely sure once it has been rebuilt again that I witnessed the final run out check before paying for it. Good luck with it.