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Go Back   FZ1OA Message Board > FZ1 & Fazer Owners Association > Parts & Accessories > Gen 2 Parts & Accessories

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Old 05-11-2018, 03:30 PM   #1
Big_Dave
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Threading Renthal 758

Guys, I'm gonna tap the ends of this Renthal bar so I can use stock bar ends.

The tap, I know 16mm but what thread size? Is it 1.5?

Thanks.
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Old 05-11-2018, 03:59 PM   #2
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yes
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Old 05-11-2018, 04:02 PM   #3
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Thanks B. Ordered it up.
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Old 05-12-2018, 06:00 PM   #4
SoCalFZRider
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Thumbs up

758 bars with 1 inch chopped off from each end.

If inquiring minds want to know, a Dynojet data logger mounts to the velcro on the aluminum bracket at the riser clamp. The toggle switch controls grip heaters.
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Old 05-14-2018, 12:46 PM   #5
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You will need to drill into the bar with a 37/64 (I used a 9/16, a little smaller but it worked fine and is easier to get) drill before tapping.
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Old 05-14-2018, 12:52 PM   #6
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Quote:
Originally Posted by Nobars View Post
You will need to drill into the bar with a 37/64 (I used a 9/16, a little smaller but it worked fine and is easier to get) drill before tapping.
Why do I need to drill into it? I chopped the ends, it's hollow...is this where the unibit comes in or what am I missing here?
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Old 05-14-2018, 01:39 PM   #7
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You will break a tap if you try and tap that much material.
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Old 05-14-2018, 01:45 PM   #8
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Now I'm confused. I talked to socal who said it was a 10 min job, no mention of a drill bit and breaking a tap. It's a 16mm tap, fits in the bar....how is it gonna break it now?
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Old 05-14-2018, 02:02 PM   #9
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The hole has to be only slightly smaller than the tap you’re going to use.
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Old 05-14-2018, 02:18 PM   #10
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It took me 10 minutes and I hit the ends with a unibit to make it easier to get the tap in.
I used this tap to do it:
https://www.amazon.com/Vermont-Ameri...70_&dpSrc=srch
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Old 05-14-2018, 03:01 PM   #11
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Quote:
Originally Posted by bmidd View Post
It took me 10 minutes and I hit the ends with a unibit to make it easier to get the tap in.
I used this tap to do it:
https://www.amazon.com/Vermont-Ameri...70_&dpSrc=srch
Exact one that I ordered. Thanks
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Old 05-14-2018, 03:27 PM   #12
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Maybe you’ll get lucky, maybe not. Have fun trying to get the broken tap out of your bar.

Not trying to be a dick, trying to help. I’ve been a machinist for 25 years.

My pro tapers wouldn’t have been able to be tapped without drilling. Maybe the renthals have a smaller wall thickness.
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Old 05-14-2018, 04:39 PM   #13
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Quote:
Originally Posted by Nobars View Post
Maybe you’ll get lucky, maybe not. Have fun trying to get the broken tap out of your bar.

Not trying to be a dick, trying to help. I’ve been a machinist for 25 years.

My pro tapers wouldn’t have been able to be tapped without drilling. Maybe the renthals have a smaller wall thickness.
Rizoma bars have a thicker wall than the stock FZ bars, I can't speak on the Renthals. I went, what I consider, slow and easy with lots of lube and an open end wrench and had no issues both times.
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Old 05-14-2018, 04:48 PM   #14
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Quote:
Originally Posted by Nobars View Post
Maybe you’ll get lucky, maybe not. Have fun trying to get the broken tap out of your bar.

Not trying to be a dick, trying to help. I’ve been a machinist for 25 years.

My pro tapers wouldn’t have been able to be tapped without drilling. Maybe the renthals have a smaller wall thickness.
Rizoma bars have a thicker wall than the stock FZ bars, I can't speak on the Renthals. I went, what I consider, slow and easy with lots of lube and an open end wrench and had no issues both times.
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Old 05-14-2018, 05:08 PM   #15
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Quote:
Originally Posted by Nobars View Post
Maybe you’ll get lucky, maybe not. Have fun trying to get the broken tap out of your bar.

Not trying to be a dick, trying to help. I’ve been a machinist for 25 years.

My pro tapers wouldn’t have been able to be tapped without drilling. Maybe the renthals have a smaller wall thickness.
I appreciate your input, but pro tapers are not renthals. This thread was for tapping Renthal 758's.

I didn't think you were being a dick at all. As I said I appreciate the input.
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Old 05-16-2018, 06:22 AM   #16
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Big_Dave - you have a pm.
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Old 05-16-2018, 06:59 AM   #17
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I don't have a clue about the internal diameter of either bar, but for a 16MM x 1.5mm pitch internal thread, the inside bar diameter would ideally be 14.50mm before tapping. That would give a 77% threadform, which is considered a pretty standard amount.

Too small of a diameter before tapping, you get too much threadform on the internal thread, and you'll get binding on the tap (and possibly break it).

Even if you don't, your male threaded part is very hard to screw in without damage.

If the internal diameter is too large, then you'll get too little threadform generated by the tap, and whatever you screw in to the finished threaded hole will be hard to tighten without stripping. Plus it will be more likely to work itself out over time & vibration due to less mating surfaces on the threads.

O.D. of thread - (% of thread x pitch(mm) / 76.980) = Recommended hole size

Of course, not everyone cares that much.

Carry on.
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Old 05-16-2018, 07:22 PM   #18
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I've never heard anyone say anything other than "nominal thread diameter minus the pitch" when talking about the tap drill of a metric thread. Where'd that equation come from?
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