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Post by scooterdog on Sept 25, 2006 20:18:56 GMT -5
With a few more miles on the Tank, I am opening it up all the way for a bit on straightaways to feel that g-force rush of power from the 250 cc mill. When I do, it almost feels like that last bit of throttle is actually slowing the scoot down a bit. I get the feeling it wants to do more but is not able. Is this common on these scoots, or is there a likely culprit to look for that is the source of this seeming hesitation? It doesn't buck or kick, just kinda like driving into a bowl of oatmeal. But...at 7/8 throttle, about 55 I'm guessing, the Tank just moves along smmoooothly. Any suggestions as to what to look for would be appreciated.
scooterdog
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Post by ooopseyesharted on Oct 11, 2006 10:14:58 GMT -5
sounds like the same thing my 50cc scoot was doin after I installed an overbore on it. I was told it needs larger jets. You may want to give that a try.
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Post by mgreenfield on Oct 11, 2006 11:33:47 GMT -5
Larger main jet in the carb is very likely. But also run without the filter and air intake ductwork to see if WOT throttle is causing it to collapse. I had this problem on my 150cc
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Post by Jacine on Oct 11, 2006 12:02:20 GMT -5
It's the main jet. Sounds like not enough fuel for the throttle setting.
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Post by T W I S T E R on Oct 13, 2006 12:33:43 GMT -5
Jacine is right again. Dam it. Can't get one over on her.  |
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Post by scooterdog on Oct 13, 2006 21:27:33 GMT -5
Thanks for replies,Dawgs,
Thought for a while that no one else had experienced this since I had no input . The fix on this sounds brutal. Can hardly SEE the carb, much less figure out how to remove it from all the plumbing and hardware to change the jet. Unless it is easier than I am thinking it is, may have to live with the problem. Any one do this already? Tank still putting along fine other than this.
scooterdog
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Post by scooterollie on Oct 13, 2006 22:18:16 GMT -5
scooterdog;
I had to pull the carb on my Bali 250 because of a flooding problem. Dreaded it but found that once I got into it, it was fairly easy. Initially thought I had to remove air filter box but discovered this was not necessary on my scoot. Remember/sketch/photograph how everything came apart so you can get it back together. Biggest problem I had was getting to some of the clamp screws. Seems the screws were positioned so as to not be accessible later for service! Method I used:
-Remove large access cover under seat.
-Disconnect throttle cable & move out of way.
-Remove screw/bolt holding radiator cap/fill neck in place. Push back out of the way.
-Loosen clamps on carb & air box ends of the "J-shaped" air induction plenum.
-Remove screw/bolt holding plenum in place. Pull/wiggle plenum to separate it from the carb and air box. Lift plenum out through access hole.
-From top, disconnect any hoses you see connected to carb.
-From top, snap off plastic cover over enricher (can't remember if this is necessary to disconnect electrical supply).
-From bottom right side, look up at carb & remove any hoses you see connected to the carb.
Gas & coolant may run out from a couple of the hoses when disconnected.
-From bottom, unplug wire harness to enricher.
-Loosen clamp holding carb to rubbery intake manifold.
-Slowly wiggle/twist carb free from rubbery intake manifold. (when replacing, be sure carb seats all the way into manifold & notch on carb aligns w/hole in manifold)
-You should be able to lift carb out through access hole.
Think I have all the steps in the correct order. When you reassemble, locate the clamp screws so they are easily accessible. Let me know how it goes.
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Post by 90GTVert on Oct 13, 2006 23:47:42 GMT -5
You may find that the larger main jet still produces the same problem. If so, you may need to do what I did and dump the vacuum fuel pump and replace it with an electric one and the starvation problem was gone. Good luck. Stan Thanks for replies,Dawgs, Thought for a while that no one else had experienced this since I had no input . The fix on this sounds brutal. Can hardly SEE the carb, much less figure out how to remove it from all the plumbing and hardware to change the jet. Unless it is easier than I am thinking it is, may have to live with the problem. Any one do this already? Tank still putting along fine other than this. scooterdog |
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Post by scooterdog on Oct 15, 2006 21:54:32 GMT -5
Thanks Again,Dawgs,
scooterollie: I appreciate the write-up on carb extraction. I will print that and have it ready if I take the plunge into the dark recesses of the Tank Innards.
Stan: I had reviewed your comments (and others) on the electric fuel pump and had concluded that it would be wise to try that upgrade first, then if it still bogged down, extract the carb. If it fixes it enough to add a bit of top-end without much bogging down, then I certainly can live with a small amount of high-speed (LOL) hesitation. Is there any easy to access 12 volt source for powering the pump (like maybe off the fuse block ?). Will see if the local Advance or AutoZone stocks them. Will post results.
scooterdog
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