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Post by mrpalmetto on Feb 6, 2015 16:13:11 GMT -5
I just replaced my 24 mm carb with a 28 mm carb with a manual choke and its a slider type carb. I can achieve 53 miles per hour and maintain that speed and still have 25% or more throttle left. What do I need to change to be able to use the remaining throttle I have left.
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Post by ricardoguitars on Feb 6, 2015 16:24:31 GMT -5
more CCs  |
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Post by mrpalmetto on Feb 6, 2015 17:06:44 GMT -5
I installed a 58.5 BBK and a new cam. Performance exhaust and air filter and all aluminum 30 mm intake. Please keep the ideas coming
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Post by rcq92130 on Feb 6, 2015 17:12:07 GMT -5
Ricardo was correct.
Any engine only has the ability to breathe in so much air/fuel. If you put in a four FOOT carb, and jet it so the mixture is OK, your engine still will not digest more than it can. Only a turbo would improve that.
If your carb is properly set up, and you have excess throttle remaining, it only means you are fully satisfying your engine's needs at 3/4 throttle. A more open intake (filter/tube) and exhaust might modestly increase what the engine can consume. More displacement will obviously do so. Otherwise, you simply are doing it all at 3/4 throttle.
ps: I learned here the exhaust header - pipe from head to muffler - is the most restrictive part of an exhaust. Does your 'performance exhaust' have a larger diameter pipe?
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Post by geh3333 on Feb 6, 2015 17:37:53 GMT -5
There could be a few reasons this is happening. What size jets at being used ? Is the carb tuned correctly and to its full potential? A high performance head will more then likely help . I have a 58.5 with the mods listed below and I have throttle response through out nearly the entire range except maybe the last 1/8 twist. I did mod my carb slightly by shortening the plunger spring " slightly" . I'm running a 32mm with a 125 main and I'm not 100% sure what the pilot is .
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Post by geh3333 on Feb 6, 2015 17:39:15 GMT -5
There could be a few reasons this is happening. What size jets at being used ? Is the carb tuned correctly and to its full potential? A high performance head will more then likely help . I have a 58.5 with the mods listed below and I have throttle response through out nearly the entire range except maybe the last 1/8 twist. I did mod my carb slightly by shortening the plunger spring " slightly" . I'm running a 32mm with a 125 main and I'm not 100% sure what the pilot is . Listen to the previous reponses also . they are all good |
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Post by mrpalmetto on Feb 7, 2015 21:48:59 GMT -5
Yes. The exhaust is now 1" , up from 3/4". I have a 115 main jet in it now. 28 mm carb, OKO with a top mount throttle cable and flat slide. Manual choke. I also have an all metal 30mm intake manifold and the larger, sexy yellow/gold color CDI that others have been recently singing high praises for on this forum lately. I also find it to be the best running CDI I've had installed. I have the black, the blue, the Orange, the stock, and now the new bigger gold one. Thanks for all the help.
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Post by alleyoop on Feb 7, 2015 22:07:30 GMT -5
I installed a 58.5 BBK and a new cam. Performance exhaust and air filter and all aluminum 30 mm intake. Please keep the ideas coming The new displacement with the 58.5 bbk is 155.36cc from the standard displacement of 149.57cc so don't expect very much from 5ccs more. Also now that is does 53mph what are the rpms at WOT? Knowing the rpms may help in determining what you need for more speed. |
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Post by alleyoop on Feb 7, 2015 22:17:09 GMT -5
Remember a BBK will give you more torque and low end power but not much top end speed. But now with more power you can do more things to get more speed. If you motor now has more power you can put in taller tranny gears which are cheap for the gains it gives, but only if the motor can pull them.
Also what are you trying to achieve? A lot more top end and how much of a top end or just a strong runner up to speed.
Those are some things that have to be known to help with what will be needed to reach those goals or at least close to what your looking for.
Alleyoop
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Post by mrpalmetto on Feb 8, 2015 17:30:46 GMT -5
Alley glad you're here. I actually have a 60 mm BB and a 61mm head. So my son says because he bought it for me and his Chuckus which he and his young friends play with. I put the 16/37 gears in like you. I have an A9 cam. Here's my big important question for the moment.
I have a 28 mm carb that came with a 120 main. I put in a 115. After setting my throttle speed, I can screw the air fuel mixture all the way closed with the RPM's increasing till it stops turning. That tells me I need to change the main jet right?
Do I go up or down in size?
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Post by alleyoop on Feb 8, 2015 17:49:48 GMT -5
Alley glad you're here. I actually have a 60 mm BB and a 61mm head. So my son says because he bought it for me and his Chuckus which he and his young friends play with. I put the 16/37 gears in like you. I have an A9 cam. Here's my big important question for the moment. I have a 28 mm carb that came with a 120 main. I put in a 115. After setting my throttle speed, I can screw the air fuel mixture all the way closed with the RPM's increasing till it stops turning. That tells me I need to change the main jet right? Do I go up or down in size? Screwing in the Air Fuel Mixture has NOTHING to do with th Main Jet. The Main Jet Takes effect around 40+ mph as the needle is being lifted out of the Main jet. So here is what you need to explain maybe I am not understanding, BUT IF you screw in the Fuel Mixture Screw all the way closed and it DOES NOT KILL your motor THEN what that tells you is the PILOT JET is to big and you need a smaller Pilot jet. Now on the other hand if you turn the Fuel mixture screw Counter Clockwise and to get a good idle and starts it is out 3 1/2 or more turns out from the closed position then you need a BIGGER PILOT JET. Now with the 115 MAIN JET at WOT or anywhere in the throttle range getting to your top speed does the motor make any sounds, like POPS, BRAT or BOG or any Backfiring? Or does it rev up nice and comes down to idle nice and quick not hanging and slow to drop the rpms. QUESTION: I forgot to ask, why did you take out the 120 main jet and put in the 115? If you did not run it with the 120 I suggest you try it and see if it's not to much fuel. You do not want to be running on the lean side little rich is always better. Also what are the RPMS at 53mph? |
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Post by jerseyboy on Feb 8, 2015 20:31:43 GMT -5
I just wanted to hop aboard this thread cause I had about 1/8 left of throttle that didn't do too much,,that was before my BBK and I really haven't ridden much yet with the BBK to see if it got better...
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Post by mrpalmetto on Feb 9, 2015 10:25:03 GMT -5
Bigger carb, up from 24mm promoted me to reduce the jet to a 115. Dumb hillbilly fishing. There are slight pops on deceleration but the whole bike is disassembled (all the plastics are off ) so I have no tach access right now. A reverse trike has LOTS of plastic body panels. Time to change the jet to allow the air fuel mixture screw to work correctly. As I closed it, the revs increased all the way till full screw in. My next move is to reinstalled the 120 main and change the pilot jet.
By the way, I bought one of the gold CDI boxes we have all been reading about, and mine died in two days. No spark. I put the blue one in and got spark.
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Post by JerryScript on Feb 9, 2015 11:20:47 GMT -5
FYI- There are several different "gold" CDIs on the market. The only one recommended around here is the advancing angle CDI sold by tvnacman. |
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Post by jerseyboy on Feb 9, 2015 12:29:16 GMT -5
FYI- There are several different "gold" CDIs on the market. The only one recommended around here is the advancing angle CDI sold by tvnacman. I have to get one of those soon....even though my Progress Racing CDI is not causing starting issues,,would just like to try one.. |
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..BAD TO THE BONE..
