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Discussion Starter #1
got a 750 dp which I cannot seem to get idle below 1200 rpm, checked for hrs for vacumn leak and nothing so took carb off, primary blades there is no gape around but secondarys have day light even with adjuster right off. is this bad casting any ideas
 

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can u push the secondarys shut? if so just put another wrap in the spring. if they wont shut easily then u have a bent shaft, warped casting, or mis adjusted blade.
 

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Discussion Starter #4
cant seem to get them to shut at all, will have base plate off, can you adjust blade wondering if there not centred so hitting one side early
 

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Probably backfired. I've seen this happen. Much easier to replace base. the removal and straightening of the shaft is not for the novice. .
 

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If the shaft is bent you can get replacement parts from BLP. Shaft, plates, screws, gaskets...
 

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there is a adjustment screw on the secondary plates to did you check that
X2^^^That's what I was thinking....You need to check that.

If that's not it, you can try loosening the 2 screws on the blades just alitte bit, then snap the throttle a couple times to re-center the blades up in the bore and re-tighten......
 
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