1 Vacuum modification Fri Jul 12, 2019 10:51 pm
Porto
Silver member
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I don't really like that high idle speed that is really above the idle speed range of 1050rpm. Right now, the only time it is a problem is when I'm not careful about rolling on the throttle. I'd rather have the problem go away and still have the engine idle ar 950rpm.MartinW wrote:Gryph some members have had success eliminating the off idle stumble by raising the idle speed to around 1100 RPM.
Regards Martin.
Porto wrote:But he told me even just spreading the vacuum across all cylinders makes a big improvement.
Well, that just sucks.duck wrote:The 4V Ks do that.
I know. I was commenting on the problems that will arise for anyone that does decide to link the four vacuum stubs. I could have been a bit clearer on that.Porto wrote:Hi Dai, there are no link tubes on two Valve biked when they roll out of the factory. But is common for bike mechanics to link them all up. Thats what happened with mine. As standard The factory has the first three capped and the end one connected to the FPR to increase the fuel pressure when you open the throttle. Balancing is easy. There are some good articles on here that explain it all. The best system I've seen and used is with four guages connected.
Point-Seven-five wrote:It's too cold to go look at my 16Valve RS, but I'm pretty sure that big manifolded rubber thingy is plumbed in above the butterfly, and thus doesn't really see the actual vacuum downstream of the butterfly. If those big hoses were really balancing the vacuum, it would be impossible to balance the throttle bodies.
I may be wrong, but I think it is plumbed to the crankcase and is an additional breather. I can't say why the the old Z tube is still there if indeed that is the function.
You mean like the ones in the photo of post #35 here? Anyway, to climb out of the vacuum hole and into the air, it seems the part that frankenduck implied was a vacuum manifold is likely to be a return-air manifold and it is connected to one of twin ports on the air box in a diagram and is labeled as an air return hose; the other port leads to an oil separator and is connected by a hose to to the crankcase, replacing the z-hose of the 2V models.Point-Seven-five wrote:There are photos of 16valve throttle bodies on eBay that show a 6mm port in the throat of the throttle body above the butterfly that connects to the hose barb that the rubber manifold connects to.
Porto wrote:Some years ago a BMW specialist and good friend made a few modifications to my K100. This vacuum tube with condensation and load valve made a huge improvement. But he told me even just spreading the vacuum across all cylinders makes a big improvement.
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