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Big Block Talk! Everything about swapping a big block engine into your cart!



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Unread 09-25-2017, 09:49 AM   #11
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Default Re: G2 Predator 670 Build

Great job on the install. Keep us posted on any additional upgrades to the engine.
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Unread 09-25-2017, 10:44 AM   #12
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Default Re: G2 Predator 670 Build

This whole 670 thing brings up a theoretical idea. When I first joined BGW in late 2014 there was a lot of people asking about this engine.It never came to be for whatever reason. Performance 670 has now stepped up and did something about some of the issues.SO here is my "what if question". What if somebody the 670 built an all modified unit for use like the VC 460 is. Lets give it billet rods,cam and valve train good to say up to 5500 rpms, along with carb mods to make all of this work and produce 30 hp. Since it is 2 cylinders we will set a budget of $1200 delivered to your door. What is the feeling about this. AND guys this is just a fantasy question. I am not doing this and have no inside track if someone is planning this.
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Unread 09-25-2017, 11:05 AM   #13
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Default Re: G2 Predator 670 Build

I don't think $1200 is going to be enough $$ to get it done. I think it would be closer to $1500. My back of the napkin math says $700 just to get rods and valvetrain. However, a build 670 would still be a cheaper option in the v-twin market and yes, at $1500 I would still be in...
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Unread 09-25-2017, 11:12 AM   #14
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Default Re: G2 Predator 670 Build

My thought here was if the parts were more mass produced the cost would come down some. Such as you get a lot more speed equipment now on the VC 460 than on earlier versions.Probably right now at performance 670 each part is almost custom made.
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Unread 09-25-2017, 04:22 PM   #15
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Default Re: G2 Predator 670 Build

For a lesser budget get the valve springs,billet rods, copper head gaskets , and clean the casting flash out of the heads , clean up the valve pockets , and unshroud the valves. Free up the intake and exhaust systems and you should be able to make more power safely down the road. It looks like they are planning more hp parts yet to be released.Another idea is to get rid of the troublesome stock carb and add a spigot type intake adapter and use something like a mikuni VM 36 or for more money a mikuni pumper flat slide. P.S. I see Summit Racing sells the Mikuni VM 36 for $115 delivered.I see with what you have done so far whipping up a manifold adapter,some linkage and an air cleaner look to be well within your skill set. P.P.S. Just for fun I looked up the other 2 carbs: the 36 flat slide is $163 and the 36 mm flat slide pumper is is $280
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Unread 09-25-2017, 05:15 PM   #16
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Default Re: G2 Predator 670 Build

While I am playing around here are pics of a 38VM Mikuni round slide and a 40 mm flat slide Mikuni pumper. These are for my ironhead sportster chopper just a shade too big I think for the 670.
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Unread 09-25-2017, 05:47 PM   #17
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Default Re: G2 Predator 670 Build

I have a 30mm round slide for my clone when I get to that project, replace the 32mm CV on it. Vegas can make rods easy enough, not sure anything else is that difficult other than the cam, or rather a new cheater cam for it.

OP- if you have a tach and you can figure it out, most of the time you can adjust max rpm you can tweak it up to more like 4K rpm that might help you out without going crazy. At 3600 it should be set at, sure its not going to go real fast unless you put HS gears in there. Just make sure your clutch is shifting some of them shift over 3600 and then your governor will kick in while accelerating.....since it kicks in before 3600 actually. At 4 K you would only hit that at top speed as the clutch would control rpm below full shift just like on a stock cart they have no engine governor. You can test if you can put a wire on the carb throttle so you can get WOT and take a run see if it changes.
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Unread 11-10-2017, 04:02 PM   #18
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Default Re: G2 Predator 670 Build

Apologies if this doesn't belong in this forum but asking questions is how I learn.
New clutch or original? Starting to put a 420cc in an '87 G2. so far have only gotten old motor out and traded for the 420. Want to use original clutch and am not sure how that will work.
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Unread 11-10-2017, 04:23 PM   #19
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Default Re: G2 Predator 670 Build

Vegascarts sells an adapter.
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Unread 11-10-2017, 09:06 PM   #20
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Default Re: G2 Predator 670 Build

If it is not trashed, the original clutch will work great on a stock 420. You can even remove the governor and those tricks and it will work great. But you start modding the 420 and it wont work as well. You put a cam and stuff in the 420 and you will be wanting a clutch you can adjust. If it is worn out, its almost cheaper to get a new clutch than to rebuild that one, though I heard now you can buy the brand new yamaha one and put just the outer part on. I don't know what you can get one for.

You just need the adpater to use the stock clutch, its a taper to 1" shaft adapter and goes on the crank and then put the clutch on. You usually have to cut the crank shorter on a G2 or G9 or the engine hits the fuel tank.
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