my friend went out and bought a 1987 Tecate-4. Can a KX500
motor go right in those without to much modifications?? What
shops know their sh#@ about building those motors?? What is
the best pipe for those quads?? Is the motor the exact same
as a KX250 dirt bike of the same year?? If not will a KX250
dirt bike cylinder bolt on to a Tecate-4 bottom end??

 

I'm not sure about your other questions, but i do know that LRD has a full exhaust system for the Tecates, its just not one of thier adjustable pipes.
-Dave

'86 250r
LRD national motor/pipe/silencer, AC pro pegs/bumper/grab bar, maier dark blue plastic, Nac's Racing graphic kit/seat cover/bar clamp/bar pad/brake block off/case guard/mud caps(beadlocks), marshall radial fronts on douglas .190's, grooved turfs on douglas/champion beadlocks, Tag bars, leagers a-arms/swing arm, LSR axle, anti fade lock nut, PeP rear shock, Ekla front shocks, GS Racing wireharness/chassis bolt kit

'01 Yamy Raptor
white bro's slip-on, razrs on the rear, AC nerfs, kill switch, turf tamers for racing.

'98 Yamy Blaster
fmf pipe/silencer, k&n filter, AC nerfs/bumper/grab bar, bandit rears on douglas .190's, fast trekker fronts on douglas .190's, renthal bars, injector block-off.

 

don't put the 500 engine in. you'll snap yoru frame because the engines not counterbalanced. the counterbalancer in my LT broke off. it shook a TON! and it also snapped my frame in 2 places. i couldn't imagine the vibration from an engine thats twice as big but i know your frame wouldn't last long!

 

I have an '88 T-4. The top end from an '87-'89 kx 250 will bolt on. If you use a kx 250 head gasket, check the compression, you don't want to be higher than 185lbs without using race gas. I don't know about putting a kx 500 motor in the frame. I have an FMF pipe, they work ok, but not great. If I were to do it over again, I would get the LRD pipe.