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Author Topic: 80 drifter no top end  (Read 4101 times)

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improse

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80 drifter no top end
« on: December 30, 2012, 02:33:56 PM »
Here we go again.Well this 80 drifter 340 has no top end.During summer I put in new crank seals like everybody told me to do.Finally ran it lastnight and it still does go past 40mph.Has new belt,carb is rebuilt ect.Any idea's ??  thx
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Lloyd (ljm)

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Re: 80 drifter no top end
« Reply #1 on: December 30, 2012, 02:40:11 PM »
 How deep of snow are you running in?

 Does the sled have a tach?

 Lloyd
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77 SST
78 Intruder
79 340 Invader
80 440 Invader
80 Drifter (bought new)
80 LTD 4/6    X2

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improse

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Re: 80 drifter no top end
« Reply #2 on: December 30, 2012, 03:29:15 PM »
Snow was like 6 to 8 inches deep.It does the same thing on 2 inches of snow(lol).Does have a tach,At 35-40 it is at 7 grand but the needle bounces between 6-7.From idea to 40 mph it pulls great,no misses or anything.Put it on a stand and free spin the track it hits 8 grand about 70 mph real quick ? Wondering if the cdi is to weak.I did notice the back side of cdi has a hole exposing a few wires.thx
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Lloyd (ljm)

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Re: 80 drifter no top end
« Reply #3 on: December 30, 2012, 04:09:28 PM »
I've never driven a 340 Drifter but have over 4000 miles on a 440 Drifter.

 I would niot be surprised if that is all its got.

 Lloyd
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77 SST
78 Intruder
79 340 Invader
80 440 Invader
80 Drifter (bought new)
80 LTD 4/6    X2

Several Deeres

Lloyd (ljm)

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Re: 80 drifter no top end
« Reply #4 on: December 30, 2012, 04:50:10 PM »
 Just checked my Drifter shop manual

 top engine RPM 6300-6500. Yes it will rev higher on a stand with no load.
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77 SST
78 Intruder
79 340 Invader
80 440 Invader
80 Drifter (bought new)
80 LTD 4/6    X2

Several Deeres

MaxThrottle

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Re: 80 drifter no top end
« Reply #5 on: December 30, 2012, 09:08:58 PM »
Top speed of the Drifter 340 should be 58 mph.
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jimvw57

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Re: 80 drifter no top end
« Reply #6 on: December 31, 2012, 12:25:26 AM »
big difference between running on a jack stand and riding through the snow. there is much more of a load with the weight of the sled and driver, plus the drag of going through the snow. The specs in the manual are "Theoretical Speeds" and not actual trail speeds.
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Lloyd (ljm)

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Re: 80 drifter no top end
« Reply #7 on: December 31, 2012, 02:32:48 AM »
  Is the ftive belt worn?
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77 SST
78 Intruder
79 340 Invader
80 440 Invader
80 Drifter (bought new)
80 LTD 4/6    X2

Several Deeres

improse

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Re: 80 drifter no top end
« Reply #8 on: January 23, 2013, 02:41:54 PM »
Quote from: Lloyd    (ljm) on December 31, 2012, 02:32:48 AM
  Is the ftive belt worn?


New belt made no difference.
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improse

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Re: 80 drifter no top end
« Reply #9 on: January 23, 2013, 02:54:37 PM »
But I do have another question.

 CDI has 18 wires coming from the box.9(mostly white)wires are capped off.Other 9 wires only a few are hooked up to the motor/coils.Vintage snow shows only 440's with a cdi/external coil setup like mine.

 

Wondering if the wiring is wrong and will not let it run to top speed ?
« Last Edit: January 23, 2013, 08:20:15 PM by improse »
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