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post #1 of 16 (permalink) Old 06-09-2019, 11:39 PM Thread Starter
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Belt slipping?

99. Used the pughco swingarm bushing upgrade kit to spherical metal bushing kit with the new rubber isolator hockey pucks. New belt and new trans sprocket. Also new front motor mount. Under hard acceleration still feels like the belt is skipping across the sprocket. Inspected the belt after 15 Miles and belt still looks new. But still no idea what's going on.. anyone have similar problems and how did you fix it? Or anyone maybe have a clue?

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post #2 of 16 (permalink) Old 06-10-2019, 08:37 AM
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99. Used the pughco swingarm bushing upgrade kit to spherical metal bushing kit with the new rubber isolator hockey pucks. New belt and new trans sprocket. Also new front motor mount. Under hard acceleration still feels like the belt is skipping across the sprocket. Inspected the belt after 15 Miles and belt still looks new. But still no idea what's going on.. anyone have similar problems and how did you fix it? Or anyone maybe have a clue?

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Welcome to the forum. I am not familiar with all the changes that you made, but I will say that if you have the belt tension correct there is no way the belt could be skipping across the sprocket.

Hopefully someone with experience will chime in.

If all the parts were installed correctly, I am going to guess that your clutch is slipping.
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post #3 of 16 (permalink) Old 06-10-2019, 08:40 AM
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I agree w/TwoWheelAddict. Furthermore, if the belt WAS slipping, the evidence would be VERY obvious in your examination of the belt.
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post #4 of 16 (permalink) Old 06-10-2019, 11:20 AM
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Originally Posted by twowheeladdict View Post
Welcome to the forum. I am not familiar with all the changes that you made, but I will say that if you have the belt tension correct there is no way the belt could be skipping across the sprocket.

Hopefully someone with experience will chime in.

If all the parts were installed correctly, I am going to guess that your clutch is slipping.

I've done the spherical bearing conversion a couple of times, they're straightforward and really hard to screw up. So I'm going with your clutch diagnosis, since toothed belts typically only "slip" once as the teeth are shaved off right before they snap...

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post #5 of 16 (permalink) Old 06-10-2019, 12:27 PM Thread Starter
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I don't lose speed bike keeps accelerating. And I run a energy one clutch with the extra plate kit. The feeling I get is like the belt is slipping across the trans sprocket. Pic is of old sprocket that belt slipped across. New sprocket is all steel

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post #6 of 16 (permalink) Old 06-10-2019, 12:55 PM
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Originally Posted by 1fast2liter View Post
I don't lose speed bike keeps accelerating. And I run a energy one clutch with the extra plate kit. The feeling I get is like the belt is slipping across the trans sprocket. Pic is of old sprocket that belt slipped across. New sprocket is all steel

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What belt tension are you setting it at. It is far better for the belt to be adjusted to the tight side of spec. I'm with everyone else here in saying that there is no way for the belt to slip across the sprocket unless your tension is way too loose or the belt is worn completely.

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post #7 of 16 (permalink) Old 06-10-2019, 01:06 PM Thread Starter
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It's set to about 3/8 deflection. Belt is new and both pulleys are new. Clutch is energy one. This dosnt feel like clutch slipping. And bike keeps gaining speed. But the whole time feels like the belt is skipping. And iam just trying to track that down

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post #8 of 16 (permalink) Old 06-10-2019, 02:05 PM
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It's set to about 3/8 deflection. Belt is new and both pulleys are new. Clutch is energy one. This dosnt feel like clutch slipping. And bike keeps gaining speed. But the whole time feels like the belt is skipping. And iam just trying to track that down

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3/8th free deflection? Or 3/8th with the tool set to 10lbs?


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post #9 of 16 (permalink) Old 06-10-2019, 02:08 PM Thread Starter
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Free I dont have the tool

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post #10 of 16 (permalink) Old 06-10-2019, 02:49 PM
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Free I dont have the tool

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Get one, 3/8 free vs. 3/8 10lbs isn't even close. You will either strip or snap the belt running it that loose for to long.


Tool is only about $35 from Harley, or $20 on eBay if your lucky. Belt is about $200 not counting labor.


Get the tool...
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