Vintage Dirt Racing on a 350 Honda Twin

Discussion in 'Racing' started by LC Garage, Jun 16, 2011.

  1. oregoncoast

    oregoncoast Racing Like a Noob

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    Duh!
    Rick my friend, you have a serious SL350 addiction issue. The first step is admitting you have a problem. The second step is for me to figure out what parts I need and hit you up for them... :evil


    :freaky
  2. Loud Al

    Loud Al .

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    It isn't a problem, he can quit anytime :rofl
  3. LC Garage

    LC Garage On Any Sunday

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    The next time I'm tempted to buy another SL350, perhaps I can give you a call, and you can talk me down from the ledge? :lol3
  4. MortimerSickle

    MortimerSickle Semi-Adventurer

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    It's that damn garage: too big, too clean, too empty.

    Something like that is just bound to cause trouble.
  5. oregoncoast

    oregoncoast Racing Like a Noob

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    Duh!
    Yeah that'll work....
  6. Ladybug0048

    Ladybug0048 Bug Sister

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    Just give me a call next time you get those urges and I'll go pick it up for you. (That worked for OC and he bought two :lol3)
  7. TwinDuro

    TwinDuro Befuddled Adventurer

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    OK, I'll admit it, I'm a member of "Honda SL350s Nonymous" as well, where our moto is:

    "I'm addicted to SL350s, and I can change, if I have to, I guess."


    :D
  8. LC Garage

    LC Garage On Any Sunday

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    Camera decided to quit working, so just a quick update;

    After a couple months of home improvement and honey do's, another race is on the horizon, the AHRMA VMX at Elkton, Oregon. Prepping the SL350 includes a tune up, valve adjustment and jetting as well as changing the forks and front wheel back to stock so the bike will qualify for AHRMA's NW Region ESS class. This is a new or experimental class designed to separate the early 70's bikes that are heavier and less refined from the faster and lighter 73 - 74 Maico's, CZ', etcetera. Hopefully it will make us a wee bit more competitive?? :D
  9. oregoncoast

    oregoncoast Racing Like a Noob

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    I wish I could make this one with you Rick. But, I get to pick up the kid from Tennis camp and then drive her to another one of her camps that weekend. Since you have lightened the bike so much, make sure you tie it down on the trailer extra tight...don't want it to float away!

    Have fun.....I know you will. Let me know if you need anything SL related. :freaky
  10. LC Garage

    LC Garage On Any Sunday

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    Getting the bike legal for the lower class means putting on a heavier stock pair of fork legs and the bigger double leading shoe drum brake.

    Pulled the wheels and forks off the racer and set those aside (disclaimer on picture quality, taken with my flip phone);

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    Pulled stock legs apart, thoroughly cleaned, replaced seals, reassembled and then mounted up on the SL;

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    Cleaned and serviced bearings and brakes and mounted wheel, on opposite side rim is pretty dinged up, maybe next year we'll put on some nice alloy rims?? :D

    Closer look at trick heavyweight wheel and arguably better brake then the little CR250 rim that was removed (we shall see);

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    Next it was on to the fuel system, the oe petcock never did flow very well and there was a little nicer valve on one of the parts bikes, it is a single outlet so I installed with a brass t, worked out pretty nice. Here is the valve still on parts bike;

    [​IMG]

    Then it was on to putting in the new smaller jets, recentering the slide needles and trying it out. I'm now down to 150 mikuni hex jets in the VM30s and it still seems rich, plugs are not quite as sooty as before, so we are getting close. Luke is going to pick up some 140 and 145's tomorrow and we will try those out. If we can ever get the plugs even close to brown, we will start the finer adjustments. :huh
  11. LC Garage

    LC Garage On Any Sunday

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    Typical jetting process, have tried jets from 200 to 130, multiple needle positions, air screw adjustments, etc. Feel like we finally hit close to the right combo tonight with the following setup;

    2.5 cut slide, 6F4 needle on middle clip, 25 pilot, 140 hex jet, 1.25 air screw, float at 24 mm and the most important thing, REMOVED the main air jets. Removing these itty bitty little air jets somehow changes the signal at the jet and for the first time since getting the bike back together was able to make a full throttle second gear start without bogging the engine. Will try riding and testing again tomorrow when fresh and thinking more clearly, but we are getting close. :D

    Big thanks to Luke for the gift of a nice new front tire (and even mounted it for me), picking up jets and plugs and spending hours talking through the setups and lending moral support. Thanks brother! :clap
  12. Ladybug0048

    Ladybug0048 Bug Sister

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    Nice to see an update. :clap
  13. Ladybug0048

    Ladybug0048 Bug Sister

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    Good luck at the race this weekend. Have a great time. :ricky
  14. Loud Al

    Loud Al .

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    Some pics from this weekend

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  15. Mr Fast

    Mr Fast Slowly striving

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    Looking good out there! :clap
  16. Ladybug0048

    Ladybug0048 Bug Sister

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    Nice shots Allan.

    Rick, you and your bike are looking mighty good. I'm miss watching you guys race. I'm going to have to make time to get to some races next year.
  17. oregoncoast

    oregoncoast Racing Like a Noob

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  18. Rockcat

    Rockcat LDA

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    I rode the trials on Saturday and walked the MX course. It looked like a good track for a twin. I'm sure you had a great time.
  19. Loud Al

    Loud Al .

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  20. LC Garage

    LC Garage On Any Sunday

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    We had a great time with friends and family at the VMX in Elkton, Oregon at the Big K Ranch. We spent Friday and Saturday in Sutherlin with my aunt and uncle and Loud Al joined us on Saturday and camped in the side yard. We all treked up the mountain near Elkton and the Big K Ranch, it is a very beautiful area with the Umpqua river curling around the 2500 acre property and the track located on top of a noll at about 800 foot elevation. We were also joined at the track by the barn fresh pit chicks Karen and Cindy, who drove 200 miles to be there. Awesome. :clap

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    Practice started out rough, as I rolled to the line the plugs started to foul, I just rode and hoped it would clear out, but not so much. The track was super greasy and there were lots of crashes, but managed to stay on my wheels.


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    After practice I pulled the 145 jets and put in 140's, opened up the idle air screws, put in my last set of fresh plugs and crossed my fingers for luck. At the start of the first moto (and it was the very first moto!) it was still wet and greasy, but did manage to pull a decent start and went into the first set of turns in 5th place. On an off camber right hander, a rider in front went down and it was all I could do to keep from ramming him and in the process crashed too. Nobody hurt, popped up, straightened handlebars and fender (kinda) and got going. Rode ok, but was so far back it didn't matter.

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    For the second moto pulled to the line and it started to slightly cut out and miss, nothing to do but hope for the best, green flag dropped and when I popped the clutch she all but quit, feathered the clutch and throttle, got moving but was nearly last. Came over the hill into the first set of corners and they were lined up mostly single file, so I went wherever they weren't and passed several riders and by halfway thru the first lap was 8th, passed 2 more before the end and finished (on track position) 6th. This race featured several classes mixed together so how I may have finished within my class is unknown. Found that if I just stayed mostly in 3rd gear and let it pull and only downshifted into 2nd on the tight turns it would run pretty good. :lol3

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    Anyway, came thru in one piece, but am determined that before next season we will either have these carbs ironed out or will go back to the stockers, i'm DONE fighting these carbs on race day. :deal

    Despite any challenges, a good time was had by all, and because we were in motos 1/1, we were off the ranch and on the highway home by 2:00 and were pretty happy about that! We were also happy that we were indeed allowed to run the Early Stock Sportsmen class and although populated by Maico's and CZ's, they are the older 4 speed models and when we get dialed in should be able to give them a run for their money. We've just begun to fight! :D