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Old 08-31-2007, 03:46 PM
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IHusky IHusky is offline
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Kawasaki engine question - horsepower

My Scag dealer told me that the Kaw 19 hp and 21 hp are basically the same block and its the carburetor that gives them more power. Is this true? He says he can put a different carb on my 19 and it will give it more hp.
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Old 08-31-2007, 03:59 PM
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All_Toro_4ME All_Toro_4ME is offline
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Seems like I have read or heard this somewhere before. I'm interested in the responses as well. If it turns out to be a carb change, then I'm all for that. I have a 19hp kaw and would def go for the extra power.
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Old 08-31-2007, 04:08 PM
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This is off topic, but All Toro 4ME, what is the going rate for 1 acre residental with about normal trimming in Ok City.
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Old 08-31-2007, 04:10 PM
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hmm, I know the pre-kai 15-17 and maybe 19's were all the same block, and had same stroke, bore and compression. Best part is that on some of them, the carb was the same too! they had the same mikuni(?) part number for the carb casting, but diffrent kawi part numbers, which led us to think they were simply jetted diffrently. Kinda the smae with the 23s and 25s.
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Old 08-31-2007, 04:59 PM
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traman traman is offline
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the way i understand it ,its just a backing plate behind the carb.all you need to do is just move it ,and it will make the venturi size larger ,letting more air flow == more power. someone in the mechanics forum should know
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Old 08-31-2007, 05:12 PM
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Quote:
Originally Posted by IHusky View Post
This is off topic, but All Toro 4ME, what is the going rate for 1 acre residental with about normal trimming in Ok City.
Assuming its flat, no obstacles/junk in yard, smooth mowing, then nothing less then $75. takes about 35-40 mins. 1 acre properties go anywhere from $75-$120 acre. Depending on if its mowed bi-weekly as opposed to tri-weekly, the tri-weekly mowing would cost greater due to more growth. Also, if there are ditches out in front of the house, where Im unable to use the Z on, then the price is higher as well. What about your area?
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Old 08-31-2007, 05:54 PM
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This is true, the engine specs on the 19 and 21 are identical, the only difference is the carb. They just dump more fuel into the 21.
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Old 08-31-2007, 08:15 PM
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Just checked...the 17HP and 19HP have same Bore, stroke and displacement. The 21HP is actually different. Going to pull carb on mine sometime to see if it has some kind of restrictor plate. The maximum torque between the 2 engines is almost identical at 36.2 and 36.6...so it appears to me save your money and get 17 instead.
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Old 08-31-2007, 08:27 PM
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Just looked at parts diagram and all parts appear to be the same...valves and cam are the same, both engines have the same part number for the insulator (The only logical part I saw to restrict performace) Carb jets are also same part number. Where is Kawasaki getting this 2 extra horsepower?

You cannot simply just "dump" more fuel into and engine to get more power...the air fuel mixture has to be proportionate, besides, dumping more fuel would require larger jets and a larger carb and the parts are the same.
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Last edited by cgaengineer; 08-31-2007 at 08:35 PM.
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Old 08-31-2007, 08:40 PM
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Restrorob Restrorob is offline
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For all the inquiring minds there are no restrict-or plates on these engines.

All the info. you need on this subject is in the below thread;


http://www.lawnsite.com/showthread.p...+Kawasaki+carb

More power too ya.....
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