Pro race engine rebuild frequency

R-acer
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R-acer
Edited Date/Time 1/26/2012 3:31am
For you guys in the know, how often do they rebuild the race engines in the pro class bikes? Is it a new engine for every race?

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jndmx
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jndmx 2/2/2009 6:54am
2/2/2009 6:54am Edited Date/Time 2/2/2009 6:54am
I am not in the know but I would have to think that would be an every race deal.
williamsmotowerx 2/2/2009 7:40am
2/2/2009 7:40am
For SX, if the engines don't have any "weak" parts like a certain gear in the trans or something like that... they don't touch them the whole season in the lites class.
Wandell
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Wandell 2/2/2009 7:45am
2/2/2009 7:45am
I believe they go through the entire engine every race.
flarider
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flarider 2/2/2009 7:48am
2/2/2009 7:48am
williamsmotowerx wrote:
For SX, if the engines don't have any "weak" parts like a certain gear in the trans or something like that... they don't touch them the...
For SX, if the engines don't have any "weak" parts like a certain gear in the trans or something like that... they don't touch them the whole season in the lites class.
Depending on team

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motofab36
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motofab36 2/2/2009 7:50am
2/2/2009 7:50am
williamsmotowerx wrote:
For SX, if the engines don't have any "weak" parts like a certain gear in the trans or something like that... they don't touch them the...
For SX, if the engines don't have any "weak" parts like a certain gear in the trans or something like that... they don't touch them the whole season in the lites class.
Really?

And weak as in the Suzuki 2nd and 3rd gear dogs?
lumpy790
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lumpy790 2/2/2009 9:02am
2/2/2009 9:02am Edited Date/Time 4/16/2016 10:17pm
While not SX I was in with the several top 250F supermoto riders and as a minimum they went threw the top ends. Piston/rings/ Valves & clutch every race and crank every other. Trans as needed.

Top HP built to the hilt 250f's have short fuses.

AMA714
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AMA714 2/2/2009 9:06am
2/2/2009 9:06am
Buddy of mine was involved with the OTSFF Suzuki Canada team and for outdoors the 450's got a new topend every 2 races and complete engine every 4.
I am guessing it depends on budget.
indymxr
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indymxr 2/2/2009 9:06am
2/2/2009 9:06am
R-acer wrote:
For you guys in the know, how often do they rebuild the race engines in the pro class bikes? Is it a new engine for every...
For you guys in the know, how often do they rebuild the race engines in the pro class bikes? Is it a new engine for every race?

For the factory teams and most of the satalite teams the engines are on a rotation. Each race bike has the motor in the chasis and a spare in the rig. After the race the motor used that night is pulled and sent back to the race shop. The motor in the rig, if not used is next in line and another motor for the race shop is sent out for the next weekend as the back up. So most factory bikes have a 3 motor rotation.
Adam43
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Adam43 2/2/2009 9:08am
2/2/2009 9:08am
lumpy790 wrote:
While not SX I was in with the several top 250F supermoto riders and as a minimum they went threw the top ends. Piston/rings/ Valves &...
While not SX I was in with the several top 250F supermoto riders and as a minimum they went threw the top ends. Piston/rings/ Valves & clutch every race and crank every other. Trans as needed.

Top HP built to the hilt 250f's have short fuses.

This is fairly typical for most of the major teams.
ktmdan
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ktmdan 2/2/2009 10:02am
2/2/2009 10:02am
Are the motors pre-broke in???
R-acer
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R-acer 2/2/2009 10:06am
2/2/2009 10:06am
ktmdan wrote:
Are the motors pre-broke in???
I was just going to ask this. If I had to guess, they must Dyno the engines after rebuilds and run them in? so they are ready to go?
ctaylor209 2/2/2009 10:28am
2/2/2009 10:28am
Every race. Engine completely disassembled, cleaned, some parts replaced, and reassembled.

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