Pablo's DR350

Discussion in 'Thumpers' started by Pablo83, Sep 14, 2010.

  1. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    I'd love to hear more about this too. Do you have any pictures of the shock mounts? Do you know what year/model your swingarm is from?
  2. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    Someone on one of the DR350 threads was recently commenting on their Jesse-modified exhaust. Shearboy, was that you? Anyway, I'd like to keep this bike real quiet and wanted to know if there was a noticeable difference in sound after Jesse's mod. Anyone?
  3. PK

    PK Been here awhile

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    Yes.

    It sounds better, deeper with a bit more volume but is still well muffled.

    But, if you really want it quiet, don't deviate from stock.
  4. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    The DR250S's footpeg brackets are rubber-mounted and heavier than the hard-mounted DR350's brackets.

    I know some of these posts seem real random, but I'm just trying to document the differences in the two bikes as I come across them.
  5. jessepitt

    jessepitt Ride More

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    I will try to take some pics of the mounting locations today. I have to apologize in advance for the quality of the pics as my real camera just died of sand inhalation, so I will have to use my cell phone.
  6. jessepitt

    jessepitt Ride More

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    So this bike belonged to inmate Creswellelkhunter. You might try to PM him for details. The swingarm itself is very stout but I think the stack-o-washers spacer could use some fine tuneing.

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  7. shearboy2004

    shearboy2004 KIWIINUSA

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    Mate with the bigger bore you will need to get a little better than stock and i have tried about everything and settled on the Jesse mod because like you I want stealth not the "hey look at me " thing.

    At our altitude I get a bit of popping on decel but nothing like you would get on the aftermarkets, play with the jetting and you will get it close .
  8. shearboy2004

    shearboy2004 KIWIINUSA

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    Another thing to consider when going big bore is the rise in compression ratio .This conversation took place late one night and was fairly revealing to me. http://www.advrider.com/forums/showthread.php?t=646691

    This is how my 450 work out .


    Somewhere around 11.8:1.

    Assumptions. 9.5:1 is accurate. I have used 350cc and 450cc as the actual displacements - fine tune it yourself :) . 1mm squish height. Flat top pistons with valve reliefs that have not changed volume. If the pistons have a dome or dish that differs from the original the new volume must be taken into account.

    1. Calculate chamber and squish volume of the 350 using C=Vs/Vc ie. Vc=Vs/C = 350/9.5 = 36.8cc

    2. Calculate the difference in volume of the squish area using V=pi.r^2.h. ie V2-V1 = (pi. (8.95/2)^2. 0.1) - (pi. (7.9/2)^2. 0.1) = 1.38cc

    3. Add volume to the chamber/squish volume calculated in 1. to the volume in 2. then calculate the new compression ratio.
    C = 450 / (36.8+1.38) = 11.77
    __________________

    Armed with this information i will be skimming the piston top next time I pull it apart . Near 12 / 1 is a little high in my opinion and yours will be even higher if you go to 460cc.
  9. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    This little thing is a real bitch to put back together:

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    If you want to save a fraction of an ounce, get the clutch pull lever from the '91 DR250S with the pimp lightening holes (or drill your own)

    [​IMG]
  10. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    Well, it's time to put the engine back in. The bike in the background will get assembled with all the leftover components and sold for cheap.

    [​IMG]
  11. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    thanks for the pics. If my swingarm doesn't work out I'll be going to one of these.
  12. Pablo83

    Pablo83 Sleep, Wrench, Ride

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  13. a1fa

    a1fa Throttle Jockey™

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    Did you say it is going to have an electric start?
  14. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    Nope, in fact, this morning I'm adding a large capacitor to the wiring harness so I can get rid of the battery.

    BTW, I now have an extra 350cc jug that has theaded holes for mounting a starter. If someone wants it, I'll trade you your old bore, or make me an offer.
  15. HeadTrauma

    HeadTrauma ¯\_(ツ)_/¯

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    Unless all the pertinent dimensions and volumes have been verified with actual measurement, the 11.8:1 number calculated backward from the OEM advertised ratio of 9.5:1 is really just a SWAG(scientific wild-ass guess). When a few of us were gathering Honda RFVC piston dims on TT, we found that not only were aftermarket pistons overstated, but that Honda overstated the stock static ratio as well. Maybe that's not the case with Suzuki; I don't know. Only taking actual measurements will say.
  16. Pablo83

    Pablo83 Sleep, Wrench, Ride

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  17. a1fa

    a1fa Throttle Jockey™

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    Almost there...
  18. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    The clutch doesn't completely engage, or disengage. I'll pull it apart to try and see what's going on. Any ideas?
  19. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    [​IMG]

    Notice the headlight is on. Without a battery, that's got to mean the engine's running... nice! It started on about the fourth kick. But now I have to tear it all apart again to see what's wrong with the clutch.
  20. Pablo83

    Pablo83 Sleep, Wrench, Ride

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    I should have done a little more research in the oversized-tank department. I ordered the Clarke tank. After I ordered it I read some reviews and everyone recommends the Acerbis tank, and no one recommends the Clarke. Here's one of the reasons: the last half gallon-or-so of gas is unusable. You can see the remaining gas in the tank is below the petcock, so unless you can wheelie your way to the gas station, you're just carrying around extra weight. I did some weighing; the tank holds 2 lb, 1 oz of useless fuel. I hate extra weight.

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