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Put a webber 32/36 on the 1.3L its making 51HP-not sure if that's good or not?

Few problems; its got high revs sitting at around 1300-1500rpm when hot...when cold (just started) will sit at 800rmp i have adjusted the idle on the carb but does not seam to stay set.
After shutting off the engine after a drive it will sputter for a few seconds and then shut off could this be caused due to the high revs or?
I've also noticed when driving the fuel gage will lets just say half full then after shutting off the engine then getting back in it after a few hours the gage will then show a different reading usually a 1/4 less that what it showed before. I get around 9L to 100kms now, could there be a fuel leak or something of the sort?
 

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Can't tell you if your HP numbers are good, or, bad. If it gets you down the road at hwy speed, its probably about right. These things were stock with only 65 ~ 70 HP when new - at the flywheel. Miles and drivetrain friction loss will cut that number considerably. With the aerodynamics of a cardboard box, the Samurai needs a big HP increase to get into the higher speed ranges. Something to do with that formula of drag increasing with the square of the velocity, or something like that (I used to know these things). Check with your local aeronautical engineer, for more details on that.
I've never had any of my Samurai on a dyno, to see what's what.
Check the carb mounting bolts and adaptor for tightness. With the Weber, they have a habit of coming loose. I ended up putting blue Loctite on my adapter mounting bolts. Loose mounting will give you all kinds of running problems. You can check for vacuum leaks around the mounting plate and carb, with a spray can of carb cleaner. Spray it around the joints (carb/mounting plate) while the engine is running. If it changes the rpm, you have a leak. Check all your other vacuum lines for connections and condition.
As for your fuel gauge, I don't know if your Sierra uses the same in tank sender as the Samurai. If it does, don't worry about it . They are notorious for inaccurate readings and eventual failure. Sooner or later, it will get really wonky in it's readings. You'll either get tired of it and fix it, or, learn to live with it. I keep track of actual mileage with my trip meter. The gauge is usually not the problem, just the sender. Both of my road legal Sammys have new senders and I still don't trust them.
 
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