03 SV650 Crank Help!!!!!!!!!!

[diablo]

Anybody know of a fix for the 03 SV650 crank problems.  I broke mine with only 815 miles on the bike.  


Thanks

Michael
#666
www.diablobikes.com

[Dawn]

Change your race number?   ???    :o

Just teasing.

[tzracer]

I am not sure exactly what the problem is with the cranks. Mine is on its second season with no problems. Survived the team challange at RA with no problems.

Did you break rods or did you break the end off the crank?

If you broke the end off, you could try to lighten the flywheel - remove magnets (do this symetrically so as to not upset the balance of the flywheel) or machine some weight off the flywheel (send it to someone who knows what they are doing).

I spoke with Mark Junge, he broke the end off an SV crank. He said it was his fault because he "was riding it like a 600".

I do not rev mine much when downshifting - tend to ease out the clutch to control wheel hop - would really like a slipper clutch. I do my downshifting later in the braking area and tend not to rev very high when downshifting (not engaging the next gear until the revs in that gear are in the 8000, maybe 9000 range).

[dylanfan53]

http://www.racemotorcycles.com/cgi-bin/board/YaBB.pl?board=ccs1;action=display;num=1112546448

Eddie Kraft wrote about crank problems in the last RRW.  You might get ahold of that article for additional info.

[tzracer]

I think the article in RRW has mostly scared people and really hasn't shown the reason for the problems nor if there is really a problem with the bike. How many 03+ cranks have failed? I don't recall seeing any at any races I have attended. David Yaakov goes pretty well on a newer SV and I have not heard of him having any problems (I do not know if he is using a stock crank either - did not have a chance to talk to him at RA).

My reasearch has shown that the stock rods work fine with the stock pistons. Go over size and you can have problems. The end of the crank breaking seems to be more a function of riding style than a problem with the crank itself. Over revving and bumping into the rev limiter regularly can affect rod and crank life.

I ran my bike a full season with no problems. Jason D'Amico and Mark Stiles both raced my bike. I routinely revved it to 11,000 rpm, but rarely hit the rev limiter. When downshifting I do not rev the bike very high or rapidly. As a precaution during the off season, I had the rods changed, and while it was apart, some (I think half, ISTR there being 6 - I did not do the work) of the magnets in the flywheel were removed. The crank is unmodified and the same one as last year.

Of course if you are worried, you could get one of these (scroll down for SV650 crank)

http://www.faliconcranks.com/suz-v.htm

[tigerblade]

I got through the entire schedule last year on mine with no engine problems whatsoever.  Of course, I'm a pansy, but I wouldn't say I took it easy on the engine either.  Had 25 street miles on it before the first Heartland Park race.   :P  I didn't bounce off the limiter at all (kinda pointless on a twin).  Mike Coulter did borrow it for a race and didn't have a problem either.  Maybe there are some "good ones" and some "bad ones", depending on manufacturing tolerances?   ???

[grasshopper]

Anybody know of a fix for the 03 SV650 crank problems.  I broke mine with only 815 miles on the bike.  


Thanks

Michael
#666
www.diablobikes.com

Was your oil level at the correct height in the engines site window?

Have you riden long wheelies?

To be safe when you rebuild your new engine, run the oil level all the way to the top of the site window.

[ekraft84]

Stock rods and stock pistons on a new SV are definitely no guarantee that you won't have failures.

I don't ride the SV like a 600 either.  While the removing of weight near the crank is a great idea, it's technically not Supersport/Stock legal.

I also know of a couple people who haven't had any problems with the newer SVs.  However I do know more that have had problems unfortunately.