Is this too big***

scratchbuilder

scratchbuilder

Member
The carb on the left is 18.2, on the right stock 79 pred. I know you guys use this size on race bikes... I'm stock. Also looking at agk's intake it looks to be 6" bend..? Be nice if they were in stock, I'd prefer to buy, how about short vs. Long intake differences..thx..
 

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That carb should work just fine on a 79cc Pred... The actual throttle slide and venturi is definitely bigger, but not by so much that it would be a nightmare to tune, just match port the intake so there's not a ridge or overhang at the intake/carb mating and it'll work.
 
i agree. Remember, the engine doesn't know or care what feeds it as long as it gets fuel.
And a four stroke is more forgiving of over carburation than the two strokes.
Not that this is anywhere close to too much.
 
Yeah guys thx. The intake port on the engine is 18. So air flow should be greatly improved. I'm hoping agk has a weld up in stock
 
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Help..ok I made a manifold(first one)...welded it,grinded it,bondo'd it. I made it to match the 15mm carb,but the intake engine port is18,but that's how the factory manifold was also.my manifold is 2"long. New sealed gaskets. Engine likes to run low end 1 click closed on the chock. Up to speed and she wants no chock..wasss..up?? I'm making a curved manifold for the carb pictured above.
 

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Racie..doh...didnt know that..if your a plug reader,what's this plug sayin..its all carbon,sooty..
 

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If it needs choke to run, your jetting is WAY wrong. Usually this means lean, but your plug makes me think is clogged or dirty since it's CLEARLY not lean.
For whatever reason, your carb is not allowing fuel to be drawn up properly. Choke adds "suction" and more fuel and sometimes acts as a band-aid for a clogged or dirty carb problem.
 
Hey M,yeah I tried my hand at drill'n the jet, I think I shouldn't have. So then I order a jet from Agk, and out of 2 choice sizes I guess wrong..lol..so I'm making a manifold for the carb pictured.
 
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not to start a new thread. My ? is where can you purchase just the cylinder side manifold flange for the 79cc HF Predator ? CNC or metal (weldable).
Thanx.
 
scratchbuilder said:
agk......affordablegokarts.com..........IF,they are in stock! If you haven't been there go...day got the shizzzz
Click to expand...
Thanx for the response Scratch, they been out for quite some time, I e-mailed them earlier and quite of few other things have been unavailable for almost 2 months.
I am gearing up for some items and not in a great rush but I have been I think a lot of different sites and they have manifolds and such but not for me.
if I only knew I should of went with the 212cc, now they have parts all over for it. HF always has a sell on these engines also. you know when I come to think about it the engine has been the easiest part to acquire since I started this build. I think I felt a tear roll down my fuzzy face, it's part joy from learning. i did make a flange but it's not pretty but will work I would like a billet one but not important.
Thanx again.
 
Here ya loud n clear. Under 'rear suspension' I did a intake, thought hey, just do it. The most expensive thing, I had, that's the drill bit. Also had 1 1/2 x 3/16 plate, a 4 1/2 grinder, file and, the mighty HF 90 amp welder. All good investments. Smooth your weld with Jb, might have pinhole. Sand and paint.
 
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yes a welder is on my list.
also need a good drill press, I have a lot of tools but there is always that specialty priced one that holds me back for awhile. :-)
 
Yeah, if I can make it work for dollars, instead of 100's, I'm good with that, I have a mental block against spending 1000$ on a bicycle.
 
I have no problem buying tools because I do a lot of different trades. but sometimes,
I have bought pretty pricey specialty tools for automotive and used them once.
But Hey! I've got em!
AGK got back to me, they said they have been remodeling their shop and office.
about another week, I just hope someone would come up the Aluminum Fly Wheel for the HF 79cc Predator. now that is something I can not do LOL....
 
i'm fittn' the rear end everything now. but now i'm thinking the Blackwell is in the Red. LOL!
slowwwwly but shirley ha.................
thanx for askn', i'll be hopefully puttn' new pics up tonight.
 
If you have some welding skills?, it's really easy to make any kind of manifold.
It's even easier to braze one up with a torch!

Just find some nice steel tubing & some flat stock & jump in there & start cutting! (^)

I'm not the greatest weldor, but here's a exhaust manifold that I welded up... (this was done with a flux core wire feed).

image-1203270427.jpg
 
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