counter balance spacer

mikey4410 · Jan 9, 2008

hey there guys,

i am seriously thinking of removing the counter balance on my 2002 fe501 and was wondering wether the spacer can be the bearing that normally sits there or does it have to be made out of steel ??

i am going to be getting the crankshaft balanced after the balancer removal.

thanks mikey

Taffy · Jan 9, 2008

this is actually quite contentious!

i used the spacer when i ran w/o the c/b a couple of years ago. but the feeling is that the main bearing needs a tall shoulder to the spacer in order to support the back of it. perhaps design whereby the oil/air is streamlined off the spacer and out through the ball race. definately have one made for peice of mind.

BTW, if you are prepared to read it, it all camwe up in a huge thread on 'mains' by orangeberg. go look in mechanical for a thread with 200 replies - and take yer sleeping bag!

regards

Taffy

mikey4410 · Jan 9, 2008

thanks very much taffy

spacer it is then.what are the dimensions of the spacer.

fe600racer · Jan 9, 2008

are you saying removing the counter balancer avoids the main bearing problems or do you just like the quick reving of the motor?

mikey4410 · Jan 9, 2008

i am hoping its one less thing to go wrong with it. i didnt know it would make a difference to reving speed

jacktar01 · Jan 9, 2008

counter balance removal

I took the balancer out of my 2003 FE400 and was advised by Dale Lineweaver to use the bearings for the spacers as they are the exact size needed and you end float should be bang on. The engine has been great and the revs pick up fast as f*** of the throttle if you need someone to balance your crank and you are in England one of my old posts gives SWR's (Sean Wilson Racing) number, give Sean a ring top bloke always good for a chat and advice he is an ex- speedway pro and now builds race engines.

mikey4410 · Jan 9, 2008

RE: counter balance removal

ok that sounds good about the end float being the same or bang on.taffy did have a good point though about making a spacer.i will definatly have that number and also how do u get on with out the balancer ??? did u have the crank rebalanced ???? regards mikey

Taffy · Jan 9, 2008

RE: counter balance removal

no i didn't. i left it for a season unbalanced and it was rough for enduro at low revs. so much so that i put it back in. i lent my bike to cypher, ady and gruntenberg in the IoM and they all said how smooth the little 400 is. i didn't want to lose that so i put it back in.

i wouldn't make a spacer without pulling the c/b out and measuring first. fact is that you can measure all this on the bench of the engineer you choose.

you'll want peice of mind. he'll want peice of mind!

and after all that?

it's all in the doc already mikey!

regards

Taffy

jacktar01 · Jan 9, 2008

counter balancer

I had my crank balanced to 70% ( Lineweaver recommend) by Sean SWR he also worked out all the reciprocating mass calculations split the crank installed a new rod kit and small end and told me the factory alignment was poor causing restriction of the big end oil ways. I have not noticed any major vibration snags off road or supermoto road use, the engine revs quicker starts well and I cant see me putting it back in. I checked and rebuilt my own engine and think the Berg balancer is a poor method of balancing unless you have a full factory support team building your engines, as technically it is a weak area, the driver gear has a central single support bearing as a pivot point taking most of the play and wear.

mikey4410 · Jan 10, 2008

thanks alot guys especially taffy.excellent info.i will be removing the balancer soon !!!!!!

excellent

Simon · Jan 11, 2008

Mikey,

You'll be fine using just the old bearings, no need to manufacture a new spacer.

But, if you want to retain somewhat smoother running, rebalancing is what you need to spend your money on.

I can tell you that the majority of the riding population don't actually know when a balancer has been removed from the engine if you don't tell them, particularly on the smaller displacement engines like yours (501) - and this has been tested on countless riders.

All the best,
Simon

Gokai134 · Jan 11, 2008

and told me the factory alignment was poor causing restriction of the big end oil ways

hi jacktar01,
could you please explain this more detailed?
How can an "unperfect" balanced crank resctrict oilflow?
IsnÃ‚Â´t the oil "inside" the crank?
How was/is the factory balance rate?

Thank you in advance

oeter

AUSBERG · Jan 11, 2008

Gokai134 said:
and told me the factory alignment was poor causing restriction of the big end oil ways

Click to expand...

hi jacktar01,
could you please explain this more detailed?
How can an "unperfect" balanced crank resctrict oilflow?
IsnÃ‚Â´t the oil "inside" the crank?
How was/is the factory balance rate?

Thank you in advance

oeter

I had to read that twice too, but I think he is referring to crankpin alignment in relation to the web- ie the oil drilling in the crankpin not aligning with the drilling in the web???.

BTW- in relation to this thread, weeds gallery has some excellent pics showing a correctly machined CB replacement spacer.

Taffy · Jan 13, 2008

as ausberg says.

gokai

you read too much into what jacktar was saying.

regards

Taffy

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