Personal Watercraft - ONLINE -
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Published on: 7/23/2001
Last Visited: 7/23/2001
Besides , Buckshot Racing owner Andrew Buck offered to bolt on the system ( and the ADA Racing cylinder head ) and join us out on the water for the test.This meant that not only would we not have to get our hands dirty , but we wouldn't have to drag the boats to the beach either.We need to do it this way more often.
The Buckshot Racing BRM carburetor kit for the Ultra 150 comes complete with three Buckshot Racing billet-aluminum intake manifolds , three 50mm Buckshot Racing billet-aluminum Magnum carburetors with a single accelerator pump and a remote Mikuni fuel pump , all necessary throttle linkage , three Buckshot Racing Pro Lite Power Filters ( flame arrestors ) , a Buckshot Racing fuel manifold and all necessary hardware , gaskets , fuel line and a throttle-cable bracket.
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Upon the arrival of the cylinder head , Buck arranged to have our Ultra 150 and the ADA Racing cylinder head picked up and taken to his shop in nearby Brea.Buck and his technician , Brian Carr , removed the Ultra's OE induction system prior to our showing up at the shop a few days later.Upon our arrival , Buck installed the ADA Racing cylinder-head setup while Carr installed the Buckshot Racing carb system.
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The ADA Racing cylinder head is a no-brainer to install , however , Buck did manage to put the head shell on the wrong way the first time.
While he didn't read the instructions that came with the head , it wouldn't really have mattered.While the instructions do tell you that the water routing is the same as stock and that you must use the fittings from the stock cylinder heads , they do not warn you to be sure to install the head shell with the fittings on the exhaust-system side of the spark plugs.Even though this is how the stock heads are set up , it is an easy item to overlook when installing a new head.Because the ADA Racing cylinder head eliminates the two OE brackets that tie the stock cylinder heads together , you also need to make sure that you install the thicker 8mm flat washers ( supplied in the kit ) on the 12 long OE cylinder-head studs.The studs are the inner studs that the two OE brackets use.The ADA Racing cylinder head does not allow you to retain the OE spark-plug cap grounding lugs.
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While Buck was hoping for at least 150 psi of cranking compression , we were content - at least for now.After all , in addition to making our Ultra faster , still being able to run pump gas was one of our primary concerns.
As far as the carb setup goes , installation was straightforward.The Buckshot Ultra 150 BRM 50mm carb kit comes with everything needed for a completely bolt-on installation.Well , except for the fact that instructions weren't quite ready when we did our test.Luckily for us , Carr and Buck did all the wrenching while we looked on.
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Buck did say that the instructions for the Ultra 150 carb kit will be complete and included in the kits by the time you read this.In addition to the instructions , the carb kit will also come with Buckshot's own accelerator pump.Because of our lurking deadline , our kit came with a combination Mikuni/Buckshot Racing accelerator pump since Buck didn't have time to complete his production-model pump.The accelerator pump not only aids in off-idle acceleration , it also eliminates the need for a fuel primer to start the craft when cold.
Although the Buckshot Racing Ultra 150 carburetor system is all bolt-on , there is a modification that you have to make to the boat that is not.Actually , there are a couple of mods that you have to make.First of all , Buck recommends enlarging the air intakes on the Ultra's hood by cutting away a section of the inner hood liner on each side.For this you can use tin snips or basically anything that will cut thick plastic.
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Due to the really high winds and the fact that Buck was going to the desert with his sandrail for a few days around New Year's , we wouldn't get back out to the water until the following week.
Finally , we made it.Our test locale of choice was a secret test site off the coast of Long Beach.As usual , we started with the acceleration and top-speed runs while water conditions were flat and the air was cool.On this day , the air temperature was hovering around 70 degrees.
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According to Buck , this problem wouldn't have occurred with slightly more compression , which he wanted in the first place.Buck likes to run at least 150 psi of cranking compression with his carb setup.We've experienced a similar sort of idle-to-WOT stumble out of the hole in the past when running big carbs without high compression.Fortunately , if your Ultra is a little low on compression like ours , ADA offers a variety of domes , including custom domes on request.
Overall , the ADA Racing/Buckshot Racing modifications gave our Ultra about what we expected.While we'd heard rumors of a 70-mph top speed with these two mods , we didn't believe them.And that's really why we did the test in the first place.