Finally got to the Blueridge parkway

Discussion in 'Rides, Swap Meets & Other Events' started by Deoodles, Jul 20, 2019.

  1. Deoodles

    Deoodles Well-Known Member

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    I just had to. Too hot in SC. Loaded it up and drove 2 hours to the BRP. Unloaded at the visitor center in Asheville NC and did about 50 miles. I thought I wasn’t going to make it but once I realized elevation I just went with it. I’m tuned at 300 feet. It was a lot of fun. I should do it more
     

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    fuelboy, detdrbuzzard, racerx and 3 others like this.
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  3. Deoodles

    Deoodles Well-Known Member

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    I’m going to make a habit out of doing this. What should I do to prevent poorly running. Basically I lost the ability to use 4th gear and 3rd was only good to 40 mph. The motor was missing under load at higher elevation and some strange pinging if I pushed it. but pulled 25 in 2nd up some very steep driveways just fine. The way back was mostly down and it flew at 50 mph with the throttle less than half. OR. Was my air filter wet from the rain I got caught in?
     
  4. cjpayne

    cjpayne Well-Known Member

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    Isnt this the bike that you modded the stock aircleaner to accept a cone filter? If so, you could have breathed in some water. Also, on your way up, you could have been climbing a steeper grade than you thought. Some roads are a little deceptive because of their surroundings. Only way to be sure about the water getting in is to go for another ride, but on a clear day. Gives you the excuse to go again too.lol

    .....or you could hit the bike with your garden hose while its idling.
     
  5. Deoodles

    Deoodles Well-Known Member

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    Yes. That’s the one. Guess I’ll have to go again and see. The grades are quite Steep sometimes.
     
  6. racerx

    racerx Administrator
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    When you're dealing with grades, power requirements are affected substantially. Once the incline exceeds about 10%, the effects increase dramatically. There aren't many places where I ride that I encounter 10% grades and the stretches of road exceeding that are even shorter. It's a double-whammy, at least. You end up running the engine at full, peak, power and at reduced speed...which reduces cooling. Engine temps can skyrocket under such conditions. Adding serious elevation changes and rain to the equation and you're into experimental territory. If that weren't enough, locales at high elevation usually sell lower octane fuel.

    With small displacement and minimal torque, the most practical solution (usually) is to just use a lower gear, that doesn't require WOT. Heat dissipation (cooling capacity) is the Achilles heel of a tune based on a 49cc lower end. You'll spike operating temps of any engine while ascending long grades.

    Descending grades is the other extreme. On a 10% grade, I find it almost difficult keeping my red bike below 60mph.

    FYI...for contrast...with modest grades (5% or less) and with even stiff headwinds, engine temps do remain within "normal" limits. Even at, or near, WOT all that extra air velocity increase cooling, as it is needed.
     
  7. Deoodles

    Deoodles Well-Known Member

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    Sounds like I have to go back on a better day and see how it does. I zoomed in on the first picture in front of elevation sign and see my temp at the top of that incline is still good. The motor was off for a minute when I snapped that. I’m beginning to think rain in my air Filter was the primary cause of the low power I experienced. When I get home this week I’m going out to see how it runs. Hope it’s back to normal
     
  8. racerx

    racerx Administrator
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    IDK, Ray...I've encountered what I think is a similar phenomenon with my red bike. It didn't really dawn on me until it happened a second time, in the same place, that there was more of an incline than I had perceived, at the time. Second time out, I turned around and rode in the opposite direction. The bike felt like it wanted to fly, oil temp dropped rapidly, from ~105C back down to 95C. Reviewing the GoPro footage confirmed the observations. The engine didn't give much indication of distress, mainly the drop in rpm could be heard. FYI, I am still a fair weather rider...hardcore. If it looks like rain, I'm driving, not riding. It is possible to hydrolock one of these engines, but unlikely. I simply don't care for riding in wet conditions...or the massive cleanup chores afterward.
     
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