Could (or should) an SR400 be modified for forest roads?
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Thread: Could (or should) an SR400 be modified for forest roads?

  1. #1
    Senior Member Cascade Rider's Avatar
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    Could (or should) an SR400 be modified for forest roads?

    While looking at a TW at my local cycle shop the other day I walked by a new SR400. Just like you never forget your first girlfriend, I immediately remembered how much my Honda CB550 delighted me in my 20's. My future riding will be split 50-50 between quiet exurban streets and mountain forest / logging roads. While my mind says look away, my emotions say otherwise. To use the girlfriend analogy again, there were women who I knew weren' t good for me but the attraction was mighty strong.

    Is it feasible (or wise) to take anSR400 with appropriate tires into the mountains?

    SR 400: seat height 31, wet weight 384, tank 3.2, rear wheel travel 4.1, front travel 5.9, front tire 90/100-18, rear 110/90-18, EFI. My hitch is rated 500 lbs.

    I never listened to my father when he warned me about some of my girlfriends, but hopefully I am a little smarter now.
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    Senior Member Xracer's Avatar
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    You can get that 60's vibe by trying to make it into a dirt bike. Other than that their are much better choices for what you want to use it for.
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  3. #3
    Senior Member Fast Eddie B's Avatar
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    I’d say go for it.

    With enduro tires and maybe a higher front tire, I’d think it would get the job done on mild off-road excursions. Think about what some manage with BMW GS’s!

    Do a Google image search for “Yamaha SR400 dirt”. One hit:


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    Super Moderator Purple's Avatar
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    Do a search for SR400 flat tracker and things get more interesting ....

    EllaspedeSR400-CafeRacer.jpg . yamaha-sr400-usa-625x416.jpg
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    Senior Member scotti158's Avatar
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    My advice is to do only bolt on mods, that way you can go back to stock with little hassle and "trade in" your girlfriend if needed.
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  7. #6
    Senior Member Cascade Rider's Avatar
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    Yamaha SR400 stock and forest road modified


  8. #7
    Senior Member Xracer's Avatar
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    OK I take back what I said. Go for it! Just make sure to get a good skidplate and take lots of pictures.

  9. #8
    Senior Member SportsterDoc's Avatar
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    I had similar thoughts, but Yamaha of Las Vegas parts manager, who rides a TW and has given a knowledgeable answer to every question, re TW and XT, commented that the SR400 did not have much power…his seat of the pants feel, after riding it.

    - The SR400 is 24 HP @ 6,400 with 7,000 redline (XT is ~ 17 HP). Using the displacement ratio of 249:399, the S400 should have about 27 HP to be proportionate.

    - 21 ft lbs at 5,500 (XT is 14.5 ft lbs). Using the displacement ratio of 249:399, the S400 should have about 23 HP to be proportionate.

    - Reviews mention vibration over 60 (XT250 is smooth to 70+)

    - The SR400 weighs 384 pounds (XT250 is 291, 93 pounds lighter)

    + The SR400 3.2 gallon tank at 66 MPG can go 211 miles (XT250 2.6 gallon tank at 76 MPG can go 197 miles)

    + The travel on the front forks of a SR400 is 3 inches less than a XT250.

    + The SR400 seat is an inch lower than the XT250.

    + Might be easier to find scrambler tires for the SR400

    https://www.yamahamotorsports.com/sp...0ab6452c51d523

    Just my 2 cents, but probably why I went with the XT250…for now.
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  10. #9
    Senior Member Maxpower's Avatar
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    Sure you could. They raced mx on bikes not that unlike it back in the day. But that's because there were no better choices back then. I do like that bike for the road though . If you have a bug up your butt for one to ride on dirt roads,go ahead and do it. Only you need to be happy with your decision . You can always sell it if it's not what you want. I wish that 400 motor came in the TW
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    Senior Member phelonius's Avatar
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    In 78 I bought one of the new SR 500s. I lived in Klamath Falls Oregon then so there was no shortage of off roading opportunities.
    I began going off road with it often, deserts, mountains. I didn't even change tires. There was a great hill climb about a mile from home where all the rugged dirt bikes tested themselves. One day on a whim I pointed the SR 500 up the hill and let her rip. Up on the pegs forward against the handlebars, A quarter mile up I cleaned the hill and stopped in front of a gawking group of dirt bike riders who just stared. They had not expected to see a pavement bike up there, much less with a windshield. I greeted them and went back down. Next time I was at the Yamaha shop I was hearing stories about how some dirt riders had seen a road bike like mine go up the hill climb and clean it.
    Sure, I crashed a few times so I traded it for an enduro.
    Phelonius

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