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Post by dirtrider1219 on Nov 6, 2015 20:04:02 GMT -6
Update: I ended up buying a 63mm, +6mm stroker from Walt at Unique Scooter Parts. i'm loving it so far but I can't get the damn thing tuned  -63mm -6mm stroker -big port head, stock size stainless valves -A12 cam -new stock carb -stock exhaust -aftermarket ruckus clone intake My #125 intitial jet size seemed a little too lean since it would cut at anything past say 3/4 throttle, and the plug seemed to back it up. Lean. So i went to bigger jets, and the problem got worse! So I went down to a #115, and it ran almost perfect but the plug shows very lean. Went to a 120 and it has some cut, but the plug still shows ashy white on the electrode and the porcelain is bright white as well. A 115 jet is surely too small for this engine no? One thing I notice is when I first ran it with the 125 jet, the valve cover got blistering hot. After that, I changed the oil, made the homemade air scoop mod, and put in the 115 jet. EVEN THOUGH IT'S MUCH LEANER IT RUNS MUCH COOLER. The engine was and still is breaking in since that 125 jet was the very first time the engine was ran. Or could the air scoop really work that well? |
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Post by czmdiver on Nov 6, 2015 22:46:40 GMT -6
Bro, C'mon, Loose the Stock Exh. You've Gone Way up in Displacement, You're dumping into a Straw.   Thats A tube inside a tube thats Smaller than your Exhaust Port. Flange Welded Off Center. Bunches of Free Flow for under a Benjamin. Theres Two Stainless Head Pipes Larger than the Exh. Port. And a Free Flow Fart Can   What Ya have for a Cylinder Head? Thes BB Stroker packages need to have the Correct Combination of Components to Work Properly/Ideal. Stock Head, Stock Exhaust, Stock Cam, Stock Carb, aint gunna cut it. |
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Post by dirtrider1219 on Nov 7, 2015 7:25:16 GMT -6
Lol I know Diver the stock exhaust is holding me back! Good thing an aftermarket one is showing up Tuesday  I also forgot to mention I have a big port head with stock size stainless valves and an A12 cam. Also the stock size carb is new. All I've done is played with the main jet size. |
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Post by Alleyoop on Nov 7, 2015 12:18:18 GMT -6
With that displacement something is not right if even a 120 seems to much. What size carb? 24mm 30mm or 32mm?
How many turns is the Fuel Ratio Mixture screw out from the closed position? And what size is the PILOT JET?
Just an F.Y.I Mine is a 62mm with a 2+2 stroker and Free Flow muffler and Air Filter and a 24mm carb with a #38 Pilot and a 122.5 Main. With a 125 main it would POP at wot it would run good with a 120 but it was on the Lean Edge so went with a 122.5 and perfect.
So that points to a problem with the carbs mixture flow.
Alleyoop
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Post by dirtrider1219 on Nov 8, 2015 10:29:00 GMT -6
I think it's 24mm, it's a new carb I got from Walt just for this engine. It was supposed to be a replacement 150 carb. Stock size pilot jet, don't know the size. What I don't get is why would it run at all, and pretty good at that, with a 115 in there? That has to be wayyy to lean for this engine, but it seems to like it. If I try to give it more fuel it cuts at 1/2 throttle and up depending on the jet. With a #130 it ran like crap and would barely get above 15mph.
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Post by dirtrider1219 on Nov 8, 2015 10:41:30 GMT -6
I've also blocked off the auto choke with the gasket method I saw in the library. Also Alley isn't the fuel ratio mixture screw just for idle/low speed, but it still has some small effect throughout the range?
It has always run good idling and part throttle no matter what jet size.
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Post by Alleyoop on Nov 8, 2015 19:34:03 GMT -6
Have to ask WHO BORED THE CASE OUT FOR YOU?
Alleyoop
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Post by dirtrider1219 on Nov 8, 2015 20:32:40 GMT -6
Alleyoop I'm not sure. Walt said it was an expert builder from North Carolina if I remember correctly. He's the one who also confirmed the kits will work on P engines.
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Post by dirtrider1219 on Nov 8, 2015 20:36:38 GMT -6
Just to be clear, the engine was built by this person in NC. I bought the engine from Walt since he wasn't using it. Walt had used the guy for years so I would assume he knows what he's doing.
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Post by Alleyoop on Nov 9, 2015 19:53:17 GMT -6
I've also blocked off the auto choke with the gasket method I saw in the library. Also Alley isn't the fuel ratio mixture screw just for idle/low speed, but it still has some small effect throughout the range? It has always run good idling and part throttle no matter what jet size. Yes the Pilot Jet controls about 3/4 of the throttle range then the MAIN JET comes in to allow even more fuel to be sucked out. You can plug up the main jet and see how far the Pilot Jet alone will take you( in mph and rpms). Many believe that the PILOT JET is only for idling and low speed but that is not true, they read it someplace and or was told by someone that does not know how the scoot carbs work. Yes the Fuel Ratio Mixture works throughout the throttle range not as much but it does. Now what most do not know about the carbs is that there are about 4 tiny fuel outlets by the butterfly and not all the tiny fuel outlets are controlled by the Fuel Ratio Mixture Screw. The ones further back when exposed by opening the butterfly more are free flowing nothing to control the amount of fuel that comes out of them. If you ever had a motor make BRAT sounds at high rpms, meaning it is a little on the LEAN side a 1/2-1 turn Richer on the fuel ratio screw will fix the problem. Same holds true if coming down from high to low and the motor makes a POPPING sound it just needs a little more fuel and again 1/2 turn richer on the fuel ratio mixture will solve that problem as well OR you can set the IDLE a little higher AGAIN opening the butterfly a little more and GUESS WHAT by doing that what your doing is exposing more PILOT JET TINY OUTLETS for more fuel. Alleyoop   |
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Post by dirtrider1219 on Nov 10, 2015 14:40:33 GMT -6
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Post by czmdiver on Nov 10, 2015 18:07:07 GMT -6
Is that a Stock Intake Manifold on there?
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Post by dirtrider1219 on Nov 10, 2015 19:36:13 GMT -6
Yes I ported the hell out of it to try to match the big port head. i didn't wanna go too much though and break through the metal layer on the inside...maybe I did and it's sucking in air through a hairline crack?
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Post by czmdiver on Nov 10, 2015 21:46:58 GMT -6
Well ya still should be able to get her down the road and back that Hogged out Stock Manifold aint gunna cut it. The Stock on the Right. I'm Not in Favor of it Supporting 200cc with a Cam.  That Stocker Cant be Hogged Out Enough.  Stock on Right. You can see there is a sizable difference. 
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Post by dirtrider1219 on Nov 11, 2015 13:52:00 GMT -6
Update: PROBLEM SOLVED!  Wanna guess what it was? The "water guard" that was on the mad dog(ruckus clone) intake was wayy TOO RESTRICTIVE, so it would run super rich when trying to suck in too much air. Took the can off and just have the filter open now and it runs great with a 125, might still be a bit on the lean side so I gonna try a 130. Come on guys, that should have been an easy one |
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I also forgot to mention I have a big port head with stock size stainless valves and an A12 cam. Also the stock size carb is new. All I've done is played with the main jet size.
..BAD TO THE BONE..
Wanna guess what it was?