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Old 08-13-2013, 02:53 PM   #1
meijer's trails OP
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what size are suzuki dr400 almunimum gascap threads

I have 3 thread peaks. Across 5mm exactly. Like first peak at 0, second 2.5,3rd at 5 mm.

Is that a 2.5mm pitch?

I think its a 50mm dia
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Old 08-13-2013, 03:53 PM   #2
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correct. metric pitch is measured distance between peaks in mm. also, if you have a thread that is metric, but too fine to measure easily peak to peak, measure how many peaks in 10mm, and divide by that amount. i.e. your threads 10mm = 4 peaks, 10/4=2.5
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Old 08-13-2013, 06:43 PM   #3
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Thanks stainless!!

Any ideas about thread diameter its either 49 50 or 51 on the 1980 Suzuki dr400

I don't have appropriate wires for thread measurement
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Old 08-14-2013, 03:13 AM   #4
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http://mdmetric.com/tech/tic1e.htm#measproc

Good stuff
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Old 08-15-2013, 02:20 AM   #5
stainlesscycle
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Quote:
Originally Posted by meijer's trails View Post
Thanks stainless!!

Any ideas about thread diameter its either 49 50 or 51 on the 1980 Suzuki dr400

I don't have appropriate wires for thread measurement
i have no idea as to the diameter. i could only guess 50, as 49 and 51 would be strange numbers for metric stuff - usually goes by even numbers in thread diameter (except the dreaded 7mm)
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Old 08-18-2013, 07:25 AM   #6
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Stainless, did you see that puch mx175 on eBay in Lansing mi? Its right b me.if you need me pick that up for you.

Anyway, Is there any chance that the dr400 could have an s.a.e. gascap thread?
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Old 08-18-2013, 08:39 AM   #7
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Threads in tanks are often buttress type. This is pretty much always the case if a plastic fuel cap is used on alloy tank.
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Old 08-18-2013, 11:08 AM   #8
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Quote:
Originally Posted by meijer's trails View Post
Stainless, did you see that puch mx175 on eBay in Lansing mi? Its right b me.if you need me pick that up for you.

Anyway, Is there any chance that the dr400 could have an s.a.e. gascap thread?
i saw it - i have enough of them at the moment


could be sae, could be national pipe thread. who knows.
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Old 08-18-2013, 07:58 PM   #9
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Hmmmm. Butress-type threads... googling now.
Never heard of those.
The Chinese ano.alum. cap I ordered has thick threads similar to acme threads from a vise. Is that a buttress?
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Old 08-19-2013, 12:24 AM   #10
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Buttress thread is similar appearance to acme. I wonder whats the problem here? Do you want to have a cap made to fit your tank?
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Old 08-19-2013, 06:42 AM   #11
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The original plastic cap is so cross threaded its basically destroyed. So crossthreaded i cant even get it to start onto the aluminum threads. So I was trying to switch to an aluminum cap for aluminum threads.

Just now Im Considering heating the threads and melting a new start into the plastic cap.

I'm also conidering a castable polyurethane into a new plastic cap.

Aluminum would be best though
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Old 08-20-2013, 12:46 AM   #12
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Aluminium into aluminium threads never tends to work that well, but I guess you could almost certainly find a cap intended for an MX bike, to fit your tank.
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Old 08-21-2013, 02:06 PM   #13
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optical comparisons are worth a thousand words 2.096"/53.25mm dia



I fnlly got an accurate measurement. 2.096"/53.25mm dia.
The threads seem to be normal 60deg type straight, not tapered.

I can't quite make out the pitch though. It seems so close to 2.5mm or 10tpi
I can't find a standard thread of that size listed in any tables
Any ideas?
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Old 08-21-2013, 03:39 PM   #14
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is there a mc junk yard near ya? i'd be bringing my tank over there and checking caps. i'm assuming there are no dr400 caps anywhere to be found?
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Old 08-21-2013, 04:59 PM   #15
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Guys, the 10tpi pitch guage really matches well(with just a tiny sliver of light equidistant at each thread)
The pitch gauge seems to have ever so slightly deeper threads than the aluminum filler neck

Ideas?.
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