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Honda Keihin Sudco Unbranded Machine Type see all Machine Type. Off-road Motorcycle 6. Dual Sport Motorcycle 2. Street Motorcycle 1. Not Specified Warranty see all Warranty. Type see all Type. Carburetor Float 1. Float Valve 1.Remember Me? What's New? Forum The Goods Trikesylvania r jetting with a 38mm carb.
Results 1 to 8 of 8. Thread: r jetting with a 38mm carb.
Keihin 38mm PWK Airstriker Carb Carburetor TRX250R ATC250R TRX ATC 250R 250 R
I'd probably start out at about main, middle needle clip, and a 52 pilot. I'm at ft, mids temps. Not sure if I'm dead-on, but it runs clean throughout the rpm range. Jetting I have a 52 pilot and a main jet with a My bike has a stroker kit and is ported a bit. It has a FMF pipes upgraded reed cage, with filter. Join Date Nov Location Florida -- 1, Not trying to go off topic here, but I also have a 86 R, has an aftermarket pipe and FMF silencer, no motor work all stock compression with just a vented airbox with the foam filter.
What size carb would you honda guys recommend using, 38mm? If I di this I take it I would have to put some bosen reeds too? The Mikuni TMX is a nice carb in those sizes as well. Thanks guys, yea I was in debates on bigger, didn't know by how much because I didn't want overkill either lol I'm definetly looking into a 38mm or even a 36mm, which ever I can grab cheaper haha. Rides, Events, Locations. All times are GMT The time now is AM.
All rights reserved.Remember Me? What's New? Forum The Goods Trikesylvania 86 honda r 38mm air striker carb questions. Results 1 to 15 of Thread: 86 honda r 38mm air striker carb questions. Join Date Jan Location pa -- I have that carb. Pros are it's easier on the throttle thumb, bigger better carb for better overall performance especially when used in conjunction with a performance reed setup and exhaust. Plus that carb gives you room to grow with your engine when you start getting into heavier mods and even most big bores.
My old setup was a stock cylinder bored. Had awesome mid range grunt, but the power signed off rather quickly at high rpm. Just did the build recently and haven't ridden it much. But I have been told by some who know their stuff that my 38mm AS carb will work just fine for my setup It's a good carb. No real drawbacks to running that carb.
I do however recommend getting the carb boot to fit the larger carb. It is available from ESR. Here is the carb I have. Also note you will need the correct throttle cable which is also available The only con would be installing it for the 1st time but thats to be expected due to the size increase. The airbox to carb boot can be a pain at 1st to connect. You might want to change your throttle cable to a longer universal motion-pro cable with the curved end at the carb.
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Seems like a lot of the r XC pros ran 36mm or smaller carbs back in the day. Everyone seems to prefer the pwk38 now days. What about a pj36? Is it old technology You might be able to get away with the 38mm on the I'd stick with the 36mm for the I'm running a 38mm on my for example. This is great for top-end power but you'll lose bottom end power and throttle response.
The 36 is not a great choice for carburetor. The 36 will loose almost as much low end as a 38, but does not make up for it on the top like a 38 does.
The 38 is a clear winner. I gives acceptable low end and roll on power. It makes more mid range and top end power. It works well when you add other mods like porting or big bore kits.
It has been a long time since I have studied carburetor theory, but I seem to recall that flat-slide carburetors have better throttle response due to their decreased length, and also something about the airflow characteristics as it relates to turbulence over the main jet. I would appreciate anybody posting articles or links to support or deny this.
In theory, a 36mm carb would have better throttle response than a 38mm due to size.
However, because the 38mm PWK is a flat slide, it will have better throttle response than a round-slide. Also, the 38mm PWK is available in an Air Striker version, which has fins to direct airflow over the venturi to improve throttle response even more. It's entirely possible that the 38mm PWK will gain all the throttle response that was lost with the increased carb size, and also have the added benefit of improved top end performance.
Unfortunately, "throttle response" is something very difficult to measure and quantify, so I can't back up my theories with any hard data. It is popular to oval bore these carbs out to mm to keep the low end snap of the 36 but have the top end of a larger carb.Welcome, Guest. Please login or register. Did you miss your activation email?
For whatever reason it becomes necessary to re-jet a carburetor, it is without a doubt a nightmare if you do not have a procedure to follow. The following is nothing more than a technique, procedure, steps or whatever you want to call it to help identify and isolate the carburetor circuit involved.
Top end is in good condition. Bottom end is in good condition. Crank seals. Spark plugs, air filters, reeds and so on. If your bike's motor is not mechanically sound, then all the jetting in the world will not help. This is the most important step in jetting your carburetor--period! Remove the main jet. Place needle clip in mid-position. Start motor and run it on the stand.
Condition: Motor running and main jet out. Correction: None needed. Condition: Needle or needle jet is too rich. Correction: Mikuni replace needle jet with next leaner and test again.
Keihin replace needle with next leaner diameter and test again. Correction: Mikuni replace needle jet with next richer and test again. Keihin replace needle with next richer diameter and test again. Make sure the bike is warmed up if at all possible. Main jet out. Needle clip in mid position.We must be doing something right.
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