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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #51  
Old 1 Week Ago
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mikaelson mikaelson is offline
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Quote:
Originally Posted by davesz1r View Post
Ok, please tell me how the dy natek s works on a 1994. I'm pretty sure the dynatek s ignition eliminates the factory module that has the advance curve programed in it. Did you . Install an earlier model mechanical advance unit? Lacking spark advance would sure make for one slow motorcycle.
It works great. I installed a mechanical advance unit instead of the OEM computer thingy. Runs really smooth and sounds great. I rarely get any misfire/backfire, it has only happened maybe once or twice.
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  #52  
Old 1 Week Ago
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So, did you find the issue?
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  #53  
Old 1 Week Ago
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mikaelson mikaelson is offline
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Quote:
Originally Posted by c1skout View Post
So, did you find the issue?
Sorry for not posting in a while. I’ve been riding and enjoying life...
I got a lot of great advice and I am very thankfull.

I am moving a few hours away to study in just about a month so I figured I may just ride while it’s still summer and look this over in the fall. As I mentioned earlier the speed limit where I live is max 55 (I live on an island), so I’ve got no real reason for the bike to go faster than that.

Promise to post the solution as soon as I get to wrenching.

I might aswell add that I bought my bike crashed last september and spent a lot of time restoring the bike and making it run again, as well as adding my own personal touch to it. So taking it apart almost immediately after getting it to working condition hurts a little. Especially when, where I live, we get about 2-3 months that are not freezing... I’m only 20 years old so I’ve still got lots to learn and hopefully a long life ahead of me, getting to know more about bikes and mechanical work.

This forum rules.
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  #54  
Old 1 Week Ago
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Quote:
Originally Posted by mikaelson View Post
Sorry for not posting in a while. I’ve been riding and enjoying life...
I got a lot of great advice and I am very thankfull.

I am moving a few hours away to study in just about a month so I figured I may just ride while it’s still summer and look this over in the fall. As I mentioned earlier the speed limit where I live is max 55 (I live on an island), so I’ve got no real reason for the bike to go faster than that.

Promise to post the solution as soon as I get to wrenching.

I might aswell add that I bought my bike crashed last september and spent a lot of time restoring the bike and making it run again, as well as adding my own personal touch to it. So taking it apart almost immediately after getting it to working condition hurts a little. Especially when, where I live, we get about 2-3 months that are not freezing... I’m only 20 years old so I’ve still got lots to learn and hopefully a long life ahead of me, getting to know more about bikes and mechanical work.

This forum rules.
Did you see how fast it will go in fourth gear? (No wrenching required...)
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  #55  
Old 1 Week Ago
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mikaelson mikaelson is offline
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Quote:
Originally Posted by Maxeffort View Post
Did you see how fast it will go in fourth gear? (No wrenching required...)
I did. It did go pretty fast, I think it stops accellerating at about 60 mph. I’ve been listening to the RPMs in all gears and it seems as the engine does not reach hogher than a certain RPM. First I’m thinking it’s the main jet that’s too small. What are the standard jet sizes on a sporty?

Could the plugs be fouled because I run a little rich on low RPM and lean om higher RPM?

Would the bike go faster if I pulled the choke when the ”RPM limit” hits?

I also did notice something a bit weird. If I’m cruising down the road, and pull hard on the throttle, it accelerates up normally for a few second, then slowd down as if it is having an asthma attack. Then, when you least expect it, it pulls forward again, with quite a bit of force. I’m thinking this has to be because of a too small main.
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  #56  
Old 1 Week Ago
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Quote:
Originally Posted by mikaelson View Post
I did. It did go pretty fast, I think it stops accellerating at about 60 mph. I’ve been listening to the RPMs in all gears and it seems as the engine does not reach hogher than a certain RPM. First I’m thinking it’s the main jet that’s too small. What are the standard jet sizes on a sporty?

Could the plugs be fouled because I run a little rich on low RPM and lean om higher RPM?

Would the bike go faster if I pulled the choke when the ”RPM limit” hits?

I also did notice something a bit weird. If I’m cruising down the road, and pull hard on the throttle, it accelerates up normally for a few second, then slowd down as if it is having an asthma attack. Then, when you least expect it, it pulls forward again, with quite a bit of force. I’m thinking this has to be because of a too small main.
Could be lean main. You should read "Plug Reading 101" that I posted a few years back. I will find a link for you later, I have to get to a job now. Reading the plugs properly is the only way other than a dyno to be sure about the tune.

I tune the idle through mid range while a huge main jet is in the carb. That way you do not take any chance of starving the needle while you tune the main operating range of the carb. Then I test the main by getting up to high RPM using a lower gear so not speeding , hold that steady then roll off the throttle slightly. If the bike picks up speed momentarily then you need a larger main jet (since I start huge, that in never my problem). If when you roll off the bike bogs, falls flat momentarily, you are rich and need a smaller main jet.

A good size main jet will feel like nothing happened as you roll off the throttle, you will just seem to coast there.

It's all about what happens when you cut the air supply some as inertia continues to feed the A/F mix to the jugs and the AF ratio gets suddenly richer than whatever it actually is.

Now if it's extremely lean, you will get surge as you ride wide open throttle and that may be something like you described.
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  #57  
Old 4 Days Ago
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One could change sprocket ratio if the engine is sound mechanically.
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