How to compete with the 450's?
#3
How to compete with the 450's?
Originally posted by: RaptorOwner
Head work(Including Valves and springs, Cam), Big Bore Kit (690 or 730) and a Rod. Thats all and you be surprised !!
Head work(Including Valves and springs, Cam), Big Bore Kit (690 or 730) and a Rod. Thats all and you be surprised !!
A higher compression stock bore piston, a new camshaft and springs, and good tires go a long way and should put you awfully close to most bolt on yfz's.
But if you're getting a yfz, why upgrade the rap? If the engine is still unopened you dont want to take it apart then sell it, better resale when its mostly stock.
#4
#5
How to compete with the 450's?
Has anyone ever explained the reason the already huge raptor engine has such low power output for its size? From its specs they should easily have DS power . Is the exhaust that restrictive or just a wierd bore /stroke combo. Ive always wondered why they have to be modded to beat much smaller engines.
#6
How to compete with the 450's?
Originally posted by: WISTECH
Has anyone ever explained the reason the already huge raptor engine has such low power output for its size? From its specs they should easily have DS power . Is the exhaust that restrictive or just a wierd bore /stroke combo. Ive always wondered why they have to be modded to beat much smaller engines.
Has anyone ever explained the reason the already huge raptor engine has such low power output for its size? From its specs they should easily have DS power . Is the exhaust that restrictive or just a wierd bore /stroke combo. Ive always wondered why they have to be modded to beat much smaller engines.
It's a mild engine in stock form. Low compression, restrictive exhaust, and poor flowing intake ports are the major contributors. But in modded form, they're almost untouchable. YFZ's, DS's, and TRX's don't have near as much potential.
#7
How to compete with the 450's?
Originally posted by: pitdawg
I can beat any stock 450 in a drag up Sand mountain (Utah dunes). With piped yfz's its hit and miss, but any other mods they smoke me. Whats my next upgrade???
I can beat any stock 450 in a drag up Sand mountain (Utah dunes). With piped yfz's its hit and miss, but any other mods they smoke me. Whats my next upgrade???
It generally takes a higher compression piston, a hotter cam, and some porting to beat a bolt-on YFZ consistently. We have several YFZ's and Rappy's in our camp. And that's been the general consensus. The YFZ's light weight, quick revving engine, and close gear spacing make it tough to beat in a hill shoot or drag.
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#8
How to compete with the 450's?
Originally posted by: WISTECH
Has anyone ever explained the reason the already huge raptor engine has such low power output for its size? From its specs they should easily have DS power . Is the exhaust that restrictive or just a wierd bore /stroke combo. Ive always wondered why they have to be modded to beat much smaller engines.
Has anyone ever explained the reason the already huge raptor engine has such low power output for its size? From its specs they should easily have DS power . Is the exhaust that restrictive or just a wierd bore /stroke combo. Ive always wondered why they have to be modded to beat much smaller engines.