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Re: Callin Allan
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Posted by K.B.-826 on May 17, 2007 at 16:59:59 from (24.180.143.209):
In Reply to: Re: Callin Allan posted by Allan In NE on May 17, 2007 at 02:47:37:
Allan, if you tie that lower arm back with some baling wire, it will not start. That pump does not have excess fuel, like the earlier Bosch rotary. You can verify this by slowly pulling back on that arm while the engine is running at an idle. Your engine with that pump will simply shut down, but if you try this on an engine with the early pump, it will rev up to 1900 RPM when you get to the excess fuel position, pull it back a little further and it will shut down. Read my responce to your original post on the subject, read Owen's post about the pistons, he gave some exellent info. The experience you are having is the nature of this beast. It's the reason we got rid of our 310-powered 686. A 706, 756, or 826 with the low-compression pistons and the old style pump will definetly start better than a 686 with low-compression pistons and the new style pump. The only explaination I can come up with is that the old style pump was discontinued and IH didn't figure out that those 310's wouldn't start without excess fuel or high compression pistons until after the 310 powered 686 went into production. The only solution to your problem is going to be a set of high compression pistons, and to make sure the valves and seats have not been ground too much.
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