Personal Water Craft Forum banner

1 - 3 of 3 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter #1
I've searched the site and have a question many others may have. If you want to use Oetiker clamps to secure your oil lines to the carbs, oil pump, or anything else for that matter, how do you determine the proper size of the clamp. For example, my nephew bought a 1999 GP800, which I happened to own over 15 years ago, that unbeknownst to him, and with out asking Uncle Bronco to go along for the buy, needed to be rebuilt, power valve pin migration problem you all know about took cylinder #1 down. I bought some tygon line, 1/8" ID 1/4" OD, to replace the oil lines and want to know everyone's opinion on the proper size of the Oetiker clamp to buy. My caliper tells me that the line when pressed on to the carb nipple is about 6.3-6.5mm. So, what size Oetiker clamps do all you enthusiasts recommend so as to eliminate inadvertent disconnection without over tightening the connection, especially hose to plastic connections like the check valves or the oil tank connection. I apologize in advance if this information already exists on the site as I gave up my search at 1 hour. If someone has a mathematical formula for the calculation applicable to any situation that would be a keeper for sure. I understand that high quality plastic zip ties secured with a "gun" are an attractive alternative to the metal Oetiker clamps, but the WDF (whole dang family) is contributing to the repair so nephew Alex doesn't trip over his already extended, very fat lip that he missed his sophomore season of baseball after making the varsity team because of this CV-19 nightmare, and then discovering that he bought a ski with a motor that needed to be rebuilt, so Uncle Bronco is under a little pressure here to deliver a reliable fix. Additional info: SBT 2 cylinder top end kit w/ cylinder exchange ordered, decided to do the crank seals as well do the aforementioned familial pressure, power valves, the whole 9 yards. Thank you very much for your time and consideration.
 

·
Registered
Joined
·
3 Posts
Discussion Starter #2
Here's what I found out about determining the appropriate size Oetiker clamp, hope it helps.

Clamp diameter
The following applies as a guideline: To determine the correct clamp diameter, push the hose onto the attaching material, (e.g. the nipple), and then measure the outer diameter of the hose. The value of the outer diameter must be slightly above the average value of the diameter range of the clamp to be selected. The listed size of the clamp denotes the inner diameter (id) of the clamp.
 

·
Registered
Joined
·
3 Posts
Discussion Starter #3
Here's a size chart I forgot to include.
Please note - the size of the clamp denotes the Inner Dimension (ID) of the clamp.

Id #
Closed - Open (MM)
Closed - Open (IN.)
6.5​
5.3 - 6.5​
0.209 - 0.256​
7.0​
5.8 – 7.0​
0.228 - 0.276​
8.0​
6.8 - 8.0​
0.268 - 0.315​
8.7​
7.0 - 8.7​
0.276 - 0.343​
9.5​
7.8 - 9.5​
0.307 - 0.374​
10.0​
8.3 - 10.0​
0.327 - 0.394​
10.5​
8.8 - 10.5​
0.347 - 0.413​
10.9​
9.2 - 10.9​
0.362 - 0.429​
11.3​
9.6 - 11.3​
0.378 - 0.445​
11.8​
10.1 - 11.8​
0.398 - 0.465​
12.3​
9.8 - 12.3​
0.386 - 0.484​
12.8​
10.3 - 12.8​
0.406 - 0.504​
13.3​
10.8 - 13.3​
0.425 - 0.524​
13.8​
11.3 - 13.8​
0.445 - 0.543​
14.0​
11.5 - 14.0​
0.453 - 0.551​
14.5​
12.0 - 14.5​
0.472 - 0.571​
14.8​
12.3 - 14.8​
0.484 - 0.583​
15.3​
12.8 - 15.3​
0.504 - 0.602​
15.7​
13.2 - 15.7​
0.520 - 0.618​
16.2​
13.7 - 16.2​
0.539 - 0.638​
17.0​
14.5 - 17.0​
0.571 - 0.669​
18.5​
15.3 - 18.5​
0.602 - 0.728​
19.8​
16.6 - 19.8​
0.654 - 0.780​
21.0​
17.8 - 21.0​
0.701 - 0.827​
22.6​
19.4 - 22.6​
0.764 - 0.890​
23.5​
20.3 - 23.5​
0.799 - 0.925​
24.1​
20.9 - 24.1​
0.823 - 0.949​
25.6​
22.4 - 25.6​
0.882 - 1.008​
27.1​
23.9 - 27.1​
0.941 - 1.067​
28.6​
25.4 - 28.6​
1.000 - 1.126​
30.1​
26.9 - 30.1​
1.059 - 1.185​
31.6​
28.4 - 31.6​
1.118 - 1.244​
34.6​
31.4 - 34.6​
1.236 - 1.362​
36.1​
32.9 - 36.1​
1.295 - 1.421​
37.6​
34.4 - 37.6​
1.354 - 1.480​
38.1​
34.9 - 38.1​
1.374 - 1.500​
38.5​
35.3 - 38.5​
1.390 - 1.516​
39.6​
36.4 - 39.6​
1.433 - 1.559​
41.0​
37.8 - 41.0​
1.488 - 1.614​
42.5​
39.3 - 42.5​
1.547 - 1.673​
44.0​
40.8 - 44.0​
1.606 - 1.732​
45.5​
42.3 - 45.5​
1.665 - 1.791​
50.0​
46.8 - 50.0​
1.843 - 1.969​
102.5​
99.3 - 102.5​
3.909 - 4.035​

So, add the open & closed numbers, divide by 2 to get the average and make sure the OD of your hose over the nipple is slightly above the average number calculated.
 
1 - 3 of 3 Posts
Top