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Jet Boats
General Jet Boat Discussions
Yamaha 784cc into welded mod-v hull
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<blockquote data-quote="86tuning" data-source="post: 452911" data-attributes="member: 23006"><p>I found the mikuni service manuals here:</p><p>https://www.mikuni.com/c-manuals.html</p><p></p><p>So according to what I could glean on the web, popoff pressure is supposed to be set at 45-55psi. </p><p>edit: stock needle seat is 1.2mm, and stock popoff is 75psi.</p><p></p><p></p><p>Well I don't have a pop off gauge. But I have a few bicycle shock pumps. As far as I can tell, a popoff gauge is a bicycle shock pump with a hose on the end of it. And the typical $60 popoff gauge is about 2x the price of a typical bicycle shock pump. Pics on the web show a similar type of pump. So my ghetto rig should work exactly the same as the special factory tools.</p><p></p><p>My bike pump threads onto a schraeder valve (tire stem). So I took a tire stem, shaved the rubber a bit to fit a piece of hose. Took the valve core out, and then threaded the adapter onto the hose of my shock pump to make a pop off gauge. Yes, a 0-60psi gauge would have been ideal. But my gauge should be repeatable enough to get both carburetors to the same setting.</p><p></p><p>[ATTACH=full]97951[/ATTACH]</p><p></p><p>[ATTACH=full]97950[/ATTACH]</p><p></p><p>[ATTACH=full]97949[/ATTACH]</p></blockquote><p></p>
[QUOTE="86tuning, post: 452911, member: 23006"] I found the mikuni service manuals here: https://www.mikuni.com/c-manuals.html So according to what I could glean on the web, popoff pressure is supposed to be set at 45-55psi. edit: stock needle seat is 1.2mm, and stock popoff is 75psi. Well I don't have a pop off gauge. But I have a few bicycle shock pumps. As far as I can tell, a popoff gauge is a bicycle shock pump with a hose on the end of it. And the typical $60 popoff gauge is about 2x the price of a typical bicycle shock pump. Pics on the web show a similar type of pump. So my ghetto rig should work exactly the same as the special factory tools. My bike pump threads onto a schraeder valve (tire stem). So I took a tire stem, shaved the rubber a bit to fit a piece of hose. Took the valve core out, and then threaded the adapter onto the hose of my shock pump to make a pop off gauge. Yes, a 0-60psi gauge would have been ideal. But my gauge should be repeatable enough to get both carburetors to the same setting. [ATTACH type="full" alt="34444433_10155336837731470_7467678917663391744_n.jpg"]97951._xfImport[/ATTACH] [ATTACH type="full" alt="34412924_10155336837781470_7448111978670718976_n.jpg"]97950._xfImport[/ATTACH] [ATTACH type="full" alt="34415036_10155336837876470_2178421010397659136_n.jpg"]97949._xfImport[/ATTACH] [/QUOTE]
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Yamaha 784cc into welded mod-v hull
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