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Post by katastroff on Mar 5, 2015 21:10:46 GMT -5
I started to look around for a flat side carb for my ride and i need a few advices.
1- I run a stock 24mm carb at the moment, so what size would be best suited to get a bit more out of the engine?
2-What's the difference between those 2t carbs and a flat side carb?
3-What would i need to do to one of those 2t carb to use it on a 4t engine?
Thx.
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Post by TurboTyler on Mar 6, 2015 3:49:12 GMT -5
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Post by katastroff on Mar 6, 2015 6:39:08 GMT -5
Yup, got a 150. What the main difference between a flat side and a PWK 2t carb?
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Post by stevec on Mar 6, 2015 18:46:43 GMT -5
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Post by stevec on Mar 6, 2015 18:50:18 GMT -5
this is one on scrappysogscooters but not taiwan like the HOCA.  Super good quality carburetor with the performance flat slide throttle, pumper, reliable electric choke, large float bowl, Keihin components, #38 pilot and #125 main jet. This carb is a must for anyone wanting to get more speed and acceleration out to their moto. The flat slide reduces veturi eddying, which results in not only better air flow, but more consistent fuel/air mixture ration. Ever seem like your bike ran weird on some days, and not others? It wasn't you, it was your cheap round slide carb. Step up to the plate and stop fooling around. Go fast, and going fast at only $99.95 |
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Post by katastroff on Mar 8, 2015 7:16:00 GMT -5
Both are really nice carbs, but what i want to know is: can a 2t flat carb be modified to fit a 4t engine.
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Post by 90GTVert on Mar 8, 2015 22:15:47 GMT -5
Should be able to use a flat slide. Not sure if they have different atomizers or atomizer bushings for 2T/4T. More info (for DellOrtos) here : www.mopedarmy.com/wiki/How_To_Tune_PHBG_CarburetorsYou could be able to mod the cable or find something that works. |
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Post by katastroff on Mar 9, 2015 13:37:23 GMT -5
I'll read it when i get back from work.
Thx!!!
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Post by niz76 on Mar 9, 2015 14:24:36 GMT -5
Hey Katastroff, My best friend gave me a Mikuni TM24 24mm flat slide carb since he wasn't using it anymore. He's into the "fast 50" pit bikes and was running this carb on one of those. It's a 4t... I don't know the particulars of installation on a 4t but the documentation I see wherever it's sold usually says it's intended for a 4 stroke?  |
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Post by katastroff on Mar 9, 2015 21:08:39 GMT -5
After much reading, it can be done by swaping the atomizer.
Next question is: Is it worth the trouble? Could be if you got the carb free like Niz did, otherwise i would say nope.
Found some nice cheap flat side carb on the intraweb, will be posting it in my build thread when i get it.
Thx guys =)
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Post by niz76 on Mar 10, 2015 1:34:47 GMT -5
Re: Mikuni 24, Gila, destroyer tuning - hint
AJ Manoulian (alextrebek) — Dec 15, 2011 11:28AM
Well this is the response from Sudco:
"It is a common misconception that primary are for 2 strokes and bleed style are for 4 strokes. You can use primary on a 4 stroke and a bleed style on a 2 stroke. A bleed style runs leaner than a primary and four strokes require leaner jetting than 2 stroke. Mikuni only offers a bleed style needle jet for the TM24 and they only offer us two sizes. On two stroke applications we run the Q-0 size and that comes standard, on 4 strokes we put the only other size that Mikuni offer us which happens to be leaner and that is the P-8."
This seems to go along with some other information I have read in Mikuni manuals, about the bleed style just running leaner than the primary. It is also true, from what I've read, that the best AFR for a 2 stroke is around 12.5:1, which, again, makes sense to want to run richer, hence the want for a primary style needle jet.
Either way, unless someone wanted to figure out how to manipulate a primary needle jet from a different carb to fit the TM24, there isn't really another option as far as plug'n'play for a primary needle jet. It should also be noted that with the bleed style needle jet, the carb is a smooth bore at WOT, which it would not be if it were fit with a primary needle jet.
So it looks like we just have to tune the leanness out through needles and the other jets and screws.
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Post by stepthrutuner on Mar 10, 2015 3:46:00 GMT -5
Does anybody know what this guy is talking about? Primary? Bleed style?
I thought I knew a little bit about carbs but this is Greek to me.
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Post by 90GTVert on Mar 10, 2015 10:49:54 GMT -5
Goto pg4 by the manual's numbers or pg8 according to a pdf viewer. www.mikuni.com/pdf/vmmanual.pdfBasically different types of needle jets or bushings as shown in the link to Moped Army about Dells. Primary is the 2T kind with the sorta shield and bleed is the 4T open type. |
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Post by katastroff on Mar 10, 2015 11:43:26 GMT -5
From reading the first link Brent posted, if you dont change the atomizer the carb will be a real PITA to tune properly.
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Post by niz76 on Mar 10, 2015 12:56:18 GMT -5
Oh boy this is getting complicated. I am starting to see how I blew a gigantic hole in my piston with what I thought should've been a relatively decent tune... I'm going to dig into my carb now and see if it's Primary or bleed. Well glad you brought this subject up Katastroff, it may have gotten me back onto the yellow brick road anyway.
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