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  #21  
Old 15th July 2020
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Quote:
Originally Posted by mikaelson View Post
After 70 it just seems like there’s no more power, no matter how hard I try getting it to go faster.
It may be starving for fuel - Have you tried pulling the enrichener out a bit to see if the engine picks up?

Have you loosened the gas cap at 60mph and then tried running it up to see if the tank is pulling a vacuum?

Did you trace down the entire fuel supply...
Clean the tank filter
Make sure the petcock is working
Make sure the bowl fills quickly (open the overflow valve and see how quickly it flows)

Have you had the carb apart to thoroughly clean every opening and passage?

Have you checked the float level?

Here's the Sportsterpedia section on the CV40 carb:
http://sportsterpedia.com/doku.php/techtalk:evo:carb02

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  #22  
Old 15th July 2020
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Diaphragm issue??
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  #23  
Old 15th July 2020
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Sounds like a fuel starving problem. Plugged screen, vacuum petcock partially closed, leaky vacuum line, float level set too low, running an extra inline filter, carb needs an overhaul, fuel cap not venting.

Could also be a bad plug or wire, and the one cylinder isn't firing correctly.
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  #24  
Old 15th July 2020
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Quote:
Originally Posted by davesz1r View Post
Sorry, just assumed you had dynatek 2000p along with pickup and coil.
My bad! Should’ve mentioned the model too. The one I have is called Dynatek DS6-2.
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  #25  
Old 15th July 2020
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Originally Posted by mikaelson View Post
Thanks! I spent like an hour making sure the ignition was right with a testing lamp. I also think the timing both sounds right and work perfectly... up to 70 that is. After 70 it just seems like there’s no more power, no matter how hard I try getting it to go faster.
Well, in my area the max limit is 55 anyways

Where can I find the gearing chart you mentioned?

I will check that my clutch is adjusted correctly.
http://xlforum.net/forums/showthread.php?t=894314

Does it appear to rev high when in neutral?

Can you shoot and post some short videos?
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  #26  
Old 15th July 2020
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Quote:
Originally Posted by mikaelson View Post
Thanks! I spent like an hour making sure the ignition was right with a testing lamp. I also think the timing both sounds right and work perfectly... up to 70 that is. After 70 it just seems like there’s no more power, no matter how hard I try getting it to go faster.
Well, in my area the max limit is 55 anyways

Where can I find the gearing chart you mentioned?

I will check that my clutch is adjusted correctly.
It needs to be sorted out whether it’s a “lack of power” problem, or a RPM limit problem.

There is a rubbermount gearing chart in this thread.

US gearing is lower than HDI gearing (Export, etc...)

FOR EXAMPLE: If you had US gearing, 70 MPH in 5th gear is about 3750 RPM
If you can go 63 MPH or faster in 4th gear (4000 RPM) it’s not an RPM limit problem.

the other thing that would be good to know... can you exceed 70 MPH in 4th gear???

http://http://xlforum.net/forums/sho...d.php?t=894314


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  #27  
Old 15th July 2020
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Quote:
Originally Posted by mikaelson View Post
My bad! Should’ve mentioned the model too. The one I have is called Dynatek DS6-2.
For the clutch, just find a steep grade, accelerate hard, try that in different gears and listen/feel for the problem. You can tell the clutch is slipping when the RPM's climb fast and you don't. Pull the lever in slightly as you are hard on throttle in mid to higher gear, then let the lever back out still under power and listen/feel for it slipping bad as it tries to reengage. You will get some slip on that last test even on a good clutch, but you will easily know if it is bad.
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  #28  
Old 15th July 2020
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Definately not the clutch slipping then! Like I originally said, the bike is quite responsive and there’s no problem except when I need to go over 70. Either me, or my biker dad, whom has been riding and building for 40 years would’ve noticed... My father also thinks the problem is with it not getting enough fuel (something like a poorly jetted carb), but I thought I might ask here because I learn a lot anyways and it’s really fantastic to get all this pro advice.

As far as the plugs go, could it be that the bike is running rich in idle (causing fouled plugs), but on high revs it runs lean, as it seems the engine isn’t getting enough fuel. Would a bigger main jet solve this?
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  #29  
Old 15th July 2020
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Quote:
Originally Posted by mikaelson View Post
Definately not the clutch slipping then! Like I originally said, the bike is quite responsive and there’s no problem except when I need to go over 70. Either me, or my biker dad, whom has been riding and building for 40 years would’ve noticed... My father also thinks the problem is with it not getting enough fuel (something like a poorly jetted carb), but I thought I might ask here because I learn a lot anyways and it’s really fantastic to get all this pro advice.

As far as the plugs go, could it be that the bike is running rich in idle (causing fouled plugs), but on high revs it runs lean, as it seems the engine isn’t getting enough fuel. Would a bigger main jet solve this?
Just pull your choke at 70. If the speed increases you're too lean.
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  #30  
Old 16th July 2020
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Originally Posted by NLXL View Post
Just pull your choke at 70. If the speed increases you're too lean.
Will do as soon as I get the chance to ride!
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