Con rods - are they really that fragile?


7 replies to this topic
  • bikemadtim

Posted April 12, 2005 - 10:34 PM

#1

I run my XR650R on the road - supermoto'd. I have 15/45 gearing and ride it fast a lot of the time. I sometimes are near to top speed for a half a mile at a time (9/10ths of the rpm limit-no rev counter so don't know exactly) I change the oil every few hundred miles and genearlly look after the bike well.

People keep saying that the con rods are a weak point and that most people fit a carrillo rod. I thougt this bike was designed to win the Baja 1000, so wide open throttle across desert for mile after mile? surely a Honda con rod is up to it?

Be interested in your opinions guys?

Cheers

  • KeithBoyd

Posted April 13, 2005 - 02:19 AM

#2

An idea(though off target ref.con rods!!!) would be perhaps to gear it similar to mine.....38 back sprocket to keep those rev`s down....you`ll still have sharp acceleration too Tim.....you`ll be pleasantly surprised.....but....erm...then you`ll be going faster but still reving at the same rate.....oh sod it...just keep her lit...ride it like you stole it!!! :naughty: :D :D :D :D :cry: :D :D :p :p :D :D :naughty:

  • XR650L_Dave

Posted April 13, 2005 - 03:10 AM

#3

Naw, that was the XR600R that was the baja-winner...

:naughty:

Dave

  • frankstr

Posted April 13, 2005 - 04:50 AM

#4

I would think that Hondas con. rod will live a decent life.........IMO.. :naughty:
And Yes the XR650R has a few wins in the Baja 1000 under its tank... :naughty:

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  • Old_Man_Time

Posted April 13, 2005 - 07:47 AM

#5

I would think that Hondas con. rod will live a decent life.........IMO.. :naughty:
And Yes the XR650R has a few wins in the Baja 1000 under its tank... :naughty:


Hasn't the XR650R won the Baja 1000 every year since it was first introduced by Honda back in 2000?

This is the first time I have ever heard anything about the connecting rod being a weak point. I think there is some kind of confusion here.

  • TimBrp

Posted April 13, 2005 - 08:38 AM

#6

I agree with old man. I've never heard of weak rods either.

  • qadsan

Posted April 13, 2005 - 08:57 AM

#7

I think it becomes a weak link once you start building the engine for a serious power increase (i.e. 680cc, h/c piston, cam, porting, ignition, etc).

  • bikemadtim

Posted April 13, 2005 - 09:21 AM

#8

Yes I agree with what has been said as surely the rev limiter keeps it from over revving and apart from jetting and airbox mods I have not altered the motor from standard. It's just I have read of 3 guys who have had big end bearings and con rods fail through over revving. They did have some engine mods done like different cams and one guy had a big bore kit.

So I can keep her pinned then and not worry?





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