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elrontx

wr 400 for short highwaay trips

9 posts in this topic

whats up everybody, i have a plated 99 wr 400 with stock gearing. its mainly for offroad use but i was thinking of riding it on the highway to hit a small local spot where its not safe to park my truck. its about 7 miles each way, ill be cruising at apx 60. im worried about messing the engine up.  what do you WR experts on this fourm think? thanks.

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Post your gearing and you'll get an answer. Most too lazy to look!

Edited by JustG

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Hey eltrontx,


 


I have a '98 WR400 that I recently rebuilt with 426 bits.  I run it in the bush once or twice a month, but it does most of its hours in motard trim with 17 inch rims.  I originally had 15/50 final gearing gearing on it but the revs were WAY to high for crusing the highway (awesome for blasting around below 80kmph though).  Went down to 15/44 next.  That brought revs at 100kmph (60mph) down to about 6600, but was still a bit high for my liking (a little vibey through the bars and pegs).  The engine in my bike is most happy between 5000 and 6000rpm so a further gearing drop to 15/39 has solved that issue. 


I've put about 8000km on it on the pavement and about 1500km dirt, with a fair bit of that at pretty high revs with out issue (and oil changes every 500-1000km).


By the way, i did the rebuild because fourth gear lost a few teeth, the 400 cylinder/piston were in pretty reasonable condition when I replaced them.


If I were you I wouldn't hesitate to blast short trips at high revs.


 


Cheers, Jed


 


Also, check out gearingcommander.com to work out what revs your engine will be doing at your intended speed and make a decision from there.


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Post your gearing and you'll get an answer. Most too lazy to look!

14/50

Edited by elrontx

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Hey eltrontx,

 

I have a '98 WR400 that I recently rebuilt with 426 bits.  I run it in the bush once or twice a month, but it does most of its hours in motard trim with 17 inch rims.  I originally had 15/50 final gearing gearing on it but the revs were WAY to high for crusing the highway (awesome for blasting around below 80kmph though).  Went down to 15/44 next.  That brought revs at 100kmph (60mph) down to about 6600, but was still a bit high for my liking (a little vibey through the bars and pegs).  The engine in my bike is most happy between 5000 and 6000rpm so a further gearing drop to 15/39 has solved that issue. 

I've put about 8000km on it on the pavement and about 1500km dirt, with a fair bit of that at pretty high revs with out issue (and oil changes every 500-1000km).

By the way, i did the rebuild because fourth gear lost a few teeth, the 400 cylinder/piston were in pretty reasonable condition when I replaced them.

If I were you I wouldn't hesitate to blast short trips at high revs.

 

Cheers, Jed

 

Also, check out gearingcommander.com to work out what revs your engine will be doing at your intended speed and make a decision from there.

 

thanks. im not to worried about it just want to hear other more mechanically inclined riders opinions. i change the oil every 200 miles or so. i ride mainly offroad. 

Edited by elrontx

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Your good, just don't shift it to hard on the road or you could have premature trans issues. They are not designed with a damper system like a street spec bike. So the trans can take a beating on the asphalt. 

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