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General Category >> Rubber Side Down! >> Please Help with fuel petcuak/Vacuum
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Message started by wnplt on 05/22/05 at 00:12:13

Title: Please Help with fuel petcuak/Vacuum
Post by wnplt on 05/22/05 at 00:12:13

I'm getting the ocassional stalling running badly lately. I go to prime and it all clears up instantly. I check the petcaulk and it is functioning normally. However the vacuum developed from the carb is more of a pulsating vacuum which doesn't allow a good solid flow from the fuel line coming from the tank. If I switch to prime it is a solid flow. My question is what kind of vacuum should I expect from the carb? Should it be enough vacuum to hold the diaphram in the petcaulk fully to allow good fuel flow to the carb or is it more just like a sputtering of fuel into the carb? Sputtering is more like what I have sometimes it sputter an okay amount of fuel to the carb and somtimes it is more of a trickel.

Title: Re: Please Help with fuel petcuak/Vacuum
Post by WD on 05/22/05 at 01:19:34

Change the vacuum line from carb to petc0ck, it is being sucked closed. Running on PRI switches to a MANUAL (gravity feed) bypass circuit, no vacuum needed for proper operation. Silicone hose works better than standard butyl rubber vacuum hose. Costs a few cents more per foot, lasts 2-3 times as long. Replace the vacuum and fuel hoses yearly.
-WD

Title: Re: Please Help with fuel petcuak/Vacuum
Post by bobo383 on 05/22/05 at 20:26:57

I converted my petc0ck to manual. I can't read my own mind, so how can the petc0ck do it for me?

Title: Re: Please Help with fuel petcuak/Vacuum
Post by Max_Morley on 05/22/05 at 22:01:40

If you still find it pulsing after chaning the hoses. Maybe you need to adjust an intake valve. Max

Title: Re: Please Help with fuel petcuak/Vacuum
Post by wnplt on 05/22/05 at 22:11:11

Does removing the valve cover require you to adjust the valves after you reinstall it? I recently did the oil plug repair. If it was a valve adjustment would it act up all the time cause it seems fine 90 percent of the time.

Title: Re: Please Help with fuel petcuak/Vacuum
Post by WD on 05/22/05 at 23:24:44

You mean ythe head cover? The valve covers are actually the funny looking little oval widgets on the head cover. And no, repairing the oil leak shouldn't necessitate a valve adjustment, but would have been a good idea to do while you had plenty of space. Adjusting them otherwise can be a pain in the butt if you don't own the tools Honda used to sell for primitive (you adjust) valve systems.

Good old Suzuki. 1980s ignition system...1920s valve train. Although, I'd actually prefer a nice points fired magneto to the system the bike came with. My trucks have points... Yep, I'm old fashioned. My NEW truck is older than I am...
-WD