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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 1 Week Ago
firevf06 firevf06 is offline
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Quote:
Originally Posted by Ferrous Head View Post
So, in neutral, if you just slowly increase the revs it's OK ?

Is that correct ?



Does this happen at idle or only when you twist the throttle ?

Lack of power when your riding the bike MIGHT NOT BE the carb.
In neutral if you just barely barely turn the throttle it will act like no fuel but it is a very small window for that in neutral. it only causes fire when you turn the throttle. also, when i shut the bike off it kept trying to run and was sputtering and coughing for several seconds. It had this fall on its face problem when i first got the bike but i adjusted the 2 screws and it cleared up for a couple weeks. I'm wondering if the intermediate tube got plugged?
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  #22  
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Sanity check time.

Do a compression test.

If that's OK. Check the ignition timing.

Then go back to the carb.

Here's a quick carb sanity check.

Buy one of the cheap S&S "Fake" Chinese carbs off Ebay. If you order one for an XLX 61 it will come jetted for your bike. Don't play with anything on that carb, just install it.

If that fixed your problem, either throw the Bendix where ever you want to and keep the Fake S&S or replace it with the Kehien and trouble shoot it leaving the S&S for future tests.

The "Fake" S&S Shorty E is like $59. It's a very cheap tool that works extremely well. You could just buy that first and skip testing compression and ignition timing.
If your pretty sure it's that carb causing the problem.
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  #23  
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firevf06 firevf06 is offline
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Quote:
Originally Posted by Ferrous Head View Post
Sanity check time.

Do a compression test.

If that's OK. Check the ignition timing.

Then go back to the carb.

Here's a quick carb sanity check.

Buy one of the cheap S&S "Fake" Chinese carbs off Ebay. If you order one for an XLX 61 it will come jetted for your bike. Don't play with anything on that carb, just install it.

If that fixed your problem, either throw the Bendix where ever you want to and keep the Fake S&S or replace it with the Kehien and trouble shoot it leaving the S&S for future tests.

The "Fake" S&S Shorty E is like $59. It's a very cheap tool that works extremely well. You could just buy that first and skip testing compression and ignition timing.
If your pretty sure it's that carb causing the problem.
I was wondering about checking the timing but I'm not sure how to on a motorcycle. It probably tells me in the book I have so will have to check. There is a shop down the road that works on old bikes and they told me they've had similar issues like this where they just bought a cheap knock off from ebay and that fixed it lol.
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  #24  
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You'll need to remove the small round cover on the cam cover to see just what ignition you are working with then we can help you out. Setting the timing is not a difficult job, but if someone changed the carb it's conceivable that it may not have the stock ignition any more either. Something else I would be adding to my check list is push rod adjustment, if you haven't already tended to it.
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  #25  
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I have not looked at the push rods yet. I will also have to read how to do that or check them. Is there a way to see if they need adjusted? Thanks
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  #26  
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Iron Mike Iron Mike is offline
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Can’t tune carb with faulty ign and out of spec compression/valve adjustment. Verify those first.
Battery voltage and connections are just as critical and could cause faulty carb like symptoms.
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  #27  
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Give this a read...
http://xlforum.net/forums/showthread.php?t=44143
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  #28  
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Quote:
There is a shop down the road that works on old bikes
Wait a second !

I thought this was an XLX ? Can't be much more than 40 years old.

I mean, it's go like Electronic Ignition and everything !

A late model thingy.
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