Feedback Score: 4 reviews
Join Date: Aug 2003
Location: Conroe, TX
Common Mechanical Problems of Prairie 650/700 & BF650sra
Thought it might be helpful to make a list of the most COMMON mechanical problems/weaknesses that occur on the Prairie 650/700, BF650sra or Twin Peaks 700. This list could be helpful for new owners and/or someone interested in buying one.
I'll start the list (in no particular order)...please post below with any suggestions you have to add to this list.
PRAIRIE COMMON MECHANICAL PROBLEMS:
1) Stock oil seals on engine and front/rear diff tend to leak; Fix: Keep an eye on them and replace as needed (no aftermarket seals available at this time).
2) Stock front strut springs are too soft for fast-paced riding; Fix: replace with aftermarket strut springs.
3) Stock airbox snorkel is too restrictive; Fix: replace with Napa Hose Mod and/or 12 hole mod in airbox lid and increase main carb jets as needed.
4) Stock CDI is very restricted; Fix: replace with aftermarket CDI to eliminate low speed and top speed retarded ignition timing and to increase maximum ignition timing.
5) Stock swingarm bearings tend to wear out prematurely, especially if mud riding often; Fix: Periodically disassemble and apply grease and/or keep an eye on them and replace as necessary.
6) Stock radiator tends to plug up with dirt/mud and cause engine overheating; Fix: Thoroughly clean the radiator fins with a water hose on a frequent basis (don't use a pressure washer), especially needed after a muddy or dusty ride.
7) Stock '02 Prairie 650 carbs had weak choke springs that sometimes caused gasoline to fill the engine while not in use/Newer model Prairies sometimes have sticky choke plungers that cause poor idling/running; Fix: Replace the '02 Prairie choke springs with '03 or later Prairie choke springs and/or turn off petcock valve while not in use, especially before hauling the quad. For newer models, clean and lubricate the choke plungers or replace as necessary.
8) Stock '02 Prairie 650 rear secondary clutch tends to wear out pre-maturely/causes significant decrease in top-speed; Fix: Replace with '03 Prairie 650 or later secondary clutch.
9) Stock actuators for the KEBC and 2wd/4wd tend to fail within a few years; Fix: Some folks remove the KEBC actuator and fork and live without the KEBC function. A few folks have also removed the 2wd/4wd actuator and modified it to function manually via a choke cable set-up. If you don't want to make those changes, you can occasionally disassemble the stock actuators to clean, lubricate and reseal with silicone/gasket maker.
10) Pre-2005 Prairie 650/700 stock rocker arm shafts had mounting bolts on the shaft that could possibly loosen and fall into the top-end of the motor causing catastrophic damage; Fix: Replace with '05 or later model Prairie rocker arm shafts.
11) Fuse box connections may corrode easily; Fix: clean and apply dielectric grease.
12) Stock front diff may break/lock-up, especially if jumping while in 4wd or if one of the oil seals leaks; Fix: Avoid jumping while in 4wd, change the front diff oil as recommended, and keep an eye on the oil seals.
13) Pre-2005 Prairies had a recall on the steering knuckles b/c the original knuckles were prone to breaking; Fix: Contact the local Kaw. dealership to make sure your Prairie 650/700 had the recall work done. You can also look at the knuckle and tell if its been updated or not.
14) 2005 and later Prairies & BF650sra had problems with the stock radiator fan breaker (aka buss connector) which tends to malfunction; Fix: Replace with inline fuse.
15) ANYTHING ELSE ???
2007 KFX 730 (sold)
2004 Twin Peaks 800 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)
Last edited by Mikeyboy_esq; 07-18-2012 at 03:18 PM.