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    Re: Re-engine Buggy with a (modified) Predator 670
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    what Dunes are these?
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    Re: Re-engine Buggy with a (modified) Predator 670
    Senior Member darwinpayne2000's Avatar
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    American Fork, UT 90 minutes from the sand
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    This is Little Sahara Recreation Area in Utah. The whole area is 60,000 acres, with about half of that area covered with sand dunes. Plenty of dunes and trails to explore.
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    Re: Re-engine Buggy with a (modified) Predator 670
    Senior Member darwinpayne2000's Avatar
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    I was back at the sand dunes last week and, so far, the buggy and the engine have been holding up well and the performance has been outstanding!!

    At this point, I'm going to follow JimmyG's advice and spend some time riding the beast instead of constantly tinkering with it. However, I'll never really be done with it. This coming winter, during my downtime, I'm looking at:

    Upgraded lighting coils

    The stator coils put out an anemic 7 amps. This is a combination of having half as many magnets as a Honda GX engine and having half the windings on the coils. I can pick up some Honda coils for about $30 and that would give me an output closer to 14 amps. Plenty of power if you're just running some LED lights. The add-on alternator kit is expensive and offers more amps than I would ever use.

    Dual Carburetors

    This is one of those "why break it when it's running so good" projects, but I'm curious how the engine would respond to a dual-carb setup. According to Performance 670, the dual carbs offer better throttle response. "Who doesn't want better throttle response?", I ask. So, why not take a perfectly running engine and screw it up for the sake of a slightly better throttle response.

    Some of the other changes will be cosmetic. The paint job is showing its age. Rust is showing up in more places. Just surface rust, but I would still like to freshen up the look of the buggy. I've always wanted to paint it John Deere green and yellow. Just because.

    So, tune back in this winter, when I have more time and money and less common sense and let's see what happens.
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    Re: Re-engine Buggy with a (modified) Predator 670
    Duck in a Tux jimmyg's Avatar
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    Love it!
    All dressed up and waiting for the beer to arrive.
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    Re: Re-engine Buggy with a (modified) Predator 670
    Senior Member
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    Sounds great! I’m jealous of the dunes being close. They’re nearly 5 hours away here. We drove through a portion of Utah a few months ago on the way to Arizona, pretty country. I’d consider the syncing of multiple carbs to not be worth it vs going with a larger bore pumper carb or a CV carb; that is, if they are finicky at all. You could have the best of both worlds with say, a bigger bore pumper CV; more flow and faster response?

    My step father in law who recently passed away left his son a pristine John Deere row crop tractor. Fabulous green and yellow combo.
    Dune 500
    YXZ1000R
    Desert kart "Panther" build
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    Re: Re-engine Buggy with a (modified) Predator 670
    Senior Member darwinpayne2000's Avatar
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    What's that saying? "It's all fun and games until . . ."

    I had my buggy out last weekend. The weather was gorgeous,with temperatures hovering in the low 60's during the day and beautiful cloudless skies. Winds were also minimal, which is good when you're out riding on the dunes.

    My buggy has been working stellar on the last few outings, but I had my suspicions about trouble this time. Just an intuition. As a safeguard, I mostly rode my buggy closer to camp. No sense in temping fate to leave you stranded way out in the middle of nowhere. On the final ride on the final day at the dunes, I was riding the buggy fairly hard and having a real blast!! Zooming up, down and around the dunes.

    At one point, I heard a "tang" sound, which usually indicates that one of the chains isn't lining up with the sprockets perfectly. I knew that I didn't have a loose chain because I inspected the chains just before I went riding. I didn't make any more noise, but I decided that heading back to camp was probably the smart thing to do. I scooted off the dunes and drove back, fairly slow, on the road that fronts the dunes.

    About a third of the way back, the buggy suddenly stopped and slid in the dirt. I got out to inspect and the left chain had come loose and wrapped around the small sprocket, jamming the jackshaft and bringing the buggy to a halt. "What the heck?", I thought. There was no reason for the chain to break and jam up. However, a closer look at the left trailing arm told the story. The trailing arm broke where it attaches to the frame and sagged down, which put the rear sprocket way out of alignment. It popped the master link apart, but didn't damage the chain otherwise.

    I unwrapped the chain from the small sprocket and, fortunately, the broken trailing arm was resting on part of the frame. I was able to limp back to camp using the power on the right wheel to keep me moving.

    I built those trailing arms several years ago and the part that broke is a 3/4" bolt that secures the arm to the frame. Basically a custom heim joint. It's taken a beating over the years and it's probably time to replace all four joints.

    Which leads to . . .

    A rebuild and inspection of the suspension and drive train. I've wanted to make some modifications to the front end, so I'll add the rebuild of the back end to the list. That's what winter is for, right? Build, build, build. Then, when the weather warms up, it ride, ride ride.

    Some pictures of the damage. Not a huge task to fix, but the jackshaft runs through the middle of the "heim" joint, so I have to take the whole jackshaft and trailing arms out to work on them.

    IMG_2460.jpgIMG_2461.jpgIMG_2462.jpg
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