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Post by wayne on Nov 5, 2020 18:04:08 GMT -5
The RE5 is sensitive to float levels. If you use an AM gasket, it's very likely that your float level is too low. As an example, a typical AM gasket measures around 0.5 mm vs the factory gasket which is 0.71 mm. This means the top of the carby which carries the float will sit lower by 0.21 mm. The factory float height measurement (done without the gasket in place) is 43.3 mm. With a correctly set float but thinner AM gasket your fuel level will be 0.21 low. It's not much, but it all adds up, especially with the RE5 carby. To compensate you'll need to amend the factory float height adjustment. As you're doing it upside down, that 0.21 difference will need to be subtracted from the 43.3 factory figure and the float will need to be set at 43.1 mm (IE when everything is assembled, the float will be higher in the bowl before cutting off fuel and therefore compensate for the thinner gasket which has inadvertently lowered the fuel level). From member Steve Phelps, here's a really simple way to see the actual fuel level in the bowl:  |
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Post by janski on Nov 6, 2020 7:53:52 GMT -5
This is a very useful tip. Are the markings upper, and lower limits? Thanks for the gasket info, one to check on the next rebuild.
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Post by HGH 770N on Nov 6, 2020 12:35:08 GMT -5
Steve. Wayne .
Thanks for that brilliant idea for a simple check .
I could make a union to screw in and hight gauge for a easy service check .
Steve should have added this to a Suzuki tool 45 years ago.
Great.
Rog
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Post by wayne on Nov 6, 2020 17:06:37 GMT -5
I'm not sure what Steve used the marks for. I could make a union to screw in and hight gauge for a easy service check . Rog I did this for my GS750 around 15 yrs ago. Drilled the drain bolt and soldered a piece of K+S brass tubing in. For the RE I'd take Steve's idea and solder something into the PMJ access bolt to do similar.  |
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Post by h2e Al In Aus on Nov 6, 2020 19:23:59 GMT -5
that is a great idea , you learn something new everyday , I will do as Wyne and make a little plug with hose fitting to check , thanks for the photos ,
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Post by wayne on Nov 6, 2020 20:37:19 GMT -5
Bye the bye, I discussed the gasket issue with Stuart Knox (member T140V) several years ago. He had measured AM gaskets as thin as 0.45 and we both had NOS originals to compare with.
He went to some trouble to source gaskets of the correct thickness which was not easy. He ended up with 0.8 mm (vs average 0.71 original) and that's the thickness of the gaskets he sells on ebay. That's much closer to original and will actually make your fuel level a little higher if you don't adjust the float. Personally, when using Stuart's gasket, I don't adjust the float, better a little rich than a little lean IMO.
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Post by timpa136 on Nov 6, 2020 23:00:04 GMT -5
I know it is not practicable, but I am curious as to the float level drop such as on the Dyno.
One neat thing of our Carburetors is most jets are available for specific throttle openings or speed and RPM ranges.
I don't know if it is important or not but when I measure and set the float, I turn the unit sideways just enough to close rather
than completely upside down maybe compressing the needle spring.
Wayne, That is the cleanest GS I have seen in some time!
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Post by wayne on Nov 7, 2020 4:41:27 GMT -5
I don't know if it is important or not but when I measure and set the float, I turn the unit sideways just enough to close rather than completely upside down maybe compressing the needle spring. Actually Tim, so do I. You can see the float slightly compressing the spring if you do it upside down. Glad I'm not the only OC on the board. As for your Dyno comment, that would be interesting....... |
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Post by hudson on Nov 10, 2020 12:00:30 GMT -5
 This is the gauge I've been using this summer to test fuel level effects on drive ability. It is a Suzuki tool for the GS series, I made the adapter from a stock brake banjo bolt because of the 1.0 x 10 mm thread was the same as the bottom carb. plug. The Suzuki factory Rep.at the time explained that they went to this method to better control emissions. The procedure was to check fuel levels then remove carbs. and make adjustment up or down to float levels as needed regardless of float level measurements to correct fuel levels to the correct factory spec.
The first thing I noticed when checking my RE was that different used floats all set to stock float level were producing different fuel levels. After weighing four different stock floats, discovering that the difference in weight was reflected in the fuel level. There is a Volkswagen/Solex float that is the same shape and a drop in replacement with a better adjustment tab and is also made from the same Nitrophyl material as the original.
After much testing, I believe the best ( correct ) fuel level is 30mm below the gasket surface of the float chamber cover using Stuart's gasket. This was within 1mm of the stock float level spec. with the new float. This test must be done with the engine running and no air bubbles in the hose.
Brian
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Post by h2e Al In Aus on Nov 10, 2020 16:09:27 GMT -5
As you said the floats are a weak point !, I found mic /solex float for mitsubishi L300 vans of the early 80s identical aswell
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Post by rotoryguy on Nov 11, 2020 4:49:03 GMT -5
Interestingly enough I just read a whole testing article on float levels using the method described here. It is in the current issue of VJMC (VJMC.Org) magazine.
Some of the article was about the measurement of fuel level based on ethanol v non-ethanol fuel as the meniscus will vary. Now THAT is OC eh?
I also measure fuel float height without compressing the valve spring. I guess we who do resto and bring life back to old bikes are all a bit on the OC!
Good stuff!
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