How many hours on bottom end?

[SS109]

Curious, how many hours do you run on a bottom end before you feel a rebuild is due?

 

[(F5)]

Well my 2007 ran the left hand main bearing in late 2018 so I rebuilt the crank as well. Don't have an hour meter so will have to estimate 'Lots'.

 

[Gasser Nate]

I used to do mine at around 300 hours. I have a mate with a 2018 that has 400 on it with no need as yet. But he is very smooth and doesn?t do high speed runs either.

 

[Nocams]

Very smooth? Thanks nate!
Sold my 2010 with just on 700 hrs.
Crank was fine.
Don?t rev the Christ outta it,well oiled filter and never lean.
Works for me.

 

[gasser]

Had over 900 hours on my 07 Gasser when I sold it and bottom end had never been touched. I went 200-300 hours between top end rebuilds.

 

[swazi_matt]

I did mine at 300hrs and the mechanic gave me the crank etc to keep as a spare since it was all still fine. I only did it because the bearings on that model were sealed, but by 300hrs the rubber seals had worn open so probably not something to worry about

And i drowned my bike a few times so had good reason to do it, but good airfilters and good oil seem to be the trick

 

[Zman]

Run good oiled air filter and quality premix oil and they last a long time.

I had 13yrs ~ 400hrs on my 2000 XC300 with the 327 big bore kit and the crank bearings started to feel and sound slightly noisy even though it was still tight. I swapped it out with a spare rebuilt bottom end I had. I would use the old one again (as it is) if I was in a pinch. I will swap the bearing when I get some free time.

 

[jasont1532]

My 2005 300 has over 70 hours. Still tight

 

[dANbOT]

I'm estimating my hours, but for the first two seasons my riding buddy counted about 200 hrs each on his meter... things have slowed down a little after that. I'd guess I have 700+ hours on my 2014 crank problem free

 

[comeragh]

About 21 years and god knows how many thousand miles on the road a few hare and hounds and a few mx tracks .
These bikes are well built .

 

[Jakobi]

All of my engines have been swam

Only every done one bottom end at 260hrs preventative. Sealed mains had dried out a little but weren't noisy. Crank still well in spec.

I've run lean at times.. and I don't mind letting the revs hit their limit on occasion either (just not all day long).