84-85 tecate cylinder difference kxt / kx questions answered

[tecat-z]

These cylinders were designed to produce high horsepower at high rpm. In motocross the engine is kept on the pipe virtually 100% of the time. Low to mid power is not nearly as important as high engine speed and overev. I wouldn't consider this state of tune if you mainly ride casually in trails and rugged terrain. Engine vibrates more at idle with the loss of flywheel effect, though it still pulls away from stop smoothly and not much different than heavy tecate flywheel. I am not using any tecate ignition components. T3lopes is using ricky stator flywheel and stator, with oem coil an cdi and it's running real hard as well. Just got it dialed on Sunday. Just got my 20-10-10, 9 paddle skat-trak haulers. Hope this bike will pull em????? Will find out real soon.

[ccdhowell]

Would love you to elaborate on the KX cylinder when you've had a chance to run it a bit. I have one waiting in the wings. How does the KX cylinder affect jetting? Seems as though you'd jet maybe one main richer for the added flow at the top end. Is that what you found or no? chris

[tecat-z]

I've already run it quite a bit gettin it dialed and its very impressive. Has an enormous hit when it comes on the pipe which is what slingshots bikes out of turns. Again, this is mainly a sand type engine for me, where high HP and RPM is key to keeping speed up. Carburetion is handled via an esr 38mm Keihin Airstryker. A very common carb. These carbs have got to be the easiest mixers to work on and dial. I am impressed with it so far and have a 48 pilot, stock needle on second groove from top, and a 195 main.

[hayesmo33]

hey all im new here i just bought a 85 tecate 3 off ebay 780$ i think it has a kx motor and not the tecae motor whats the differnt in the motors?what all kx years will fit it looks as if they made front motor mounts.i just wont to get the right parts ive already order a carb factory air box before i was told it was the wrong motor hope it all fits? the more imfo i get the better

[scooterroo]

the 83/84 kx motors swap right in to the 84/85 t3. the trannies i believe are geared a bit different, and the ditinquishing character of the mtoor is the bridge on the exhaust port. if there is a bridge it is a kx cylinder, if there isnt a bridge just an open port it is a t3 motor.

[nd4speed]

hey all im new here i just bought a 85 tecate 3 off ebay 780$ i think it has a kx motor and not the tecae motor whats the differnt in the motors?what all kx years will fit it looks as if they made front motor mounts.i just wont to get the right parts ive already order a carb factory air box before i was told it was the wrong motor hope it all fits? the more imfo i get the better

Look at my motor swap threaD:

http://www.3wheelerworldforums.com/s...ad.php?t=60994

[hayesmo33]

Hey all i have another question for you all will delta v force reeds fit right in the 85 tecate? if so do i order them for kx250 cant seem to find meny parts for this bike hope to find a pipe and or silencer!!!

[scooterroo]

try dg if you want a new pipe and silencer, they are about the only ones left that make them still. or post a want ad in classifieds, im sure someone would have one for you. t3s are alot harder to find parts for then other bikes...but the parts are there. and oh yeah, vforce 3 reeds slip right in nice, and yes you can order them for the kx or the kxt model...check dennis kirk.

[hayesmo33]

hey im trying to get my carb dialed in its stock carb the one that came on the bike in 85. but the guy i got it from had a pipe reed big bore and so on.im just trying to learn how to jet it or where to start he said start with main jet 165??everything else wouled be fine he said the jet in it was way to big other then air filter my bike is the way it came in 85.please help reason i got differnt carb was becuse it cut out at top end.like it was runing out of gas. thank you Hayes murray 2 more wks she be at saint joe park in mo.hoping it will be runing good

[heyy]

But if your going to go through this why not just replace the piston also, if I'm corrct didn't the 84/85 pistons have a low compression like 8.5-1... Could u use a stock 86/87 piston they have a little higher comp. Or do u have to go aftermarket?

[tecat-z]

All pistons are the same, and have been so for years. In other words 84-87 kxt and 83-86 kx 250. Same bore X stroke. "stock" oem pistons only come in 70mm, and are discontinued. Wiseco is your best alternative.

[heyy]

But then what gives the later tecates the bump in compresion? Is it the head itself?

[cr480r]

But then what gives the later tecates the bump in compresion? Is it the head itself?

It could be.. but if you are comparing the manufacturers claimed corrected compresion ratios then the difference could likely be due to porting changes..

[cr480r]

i bet if a person added aux. exhaust ports to a tecate cylinder it would be superior to the kx cylinder... There is a reason KX250's havent used a bridged exhaust port since 1985... anyone ever tried this? or seen or heard of it being done?

[tecat-z]

Much of the reason for them not using that layout on newer designed 2 strokes is that the oems have adopted the small bore long stroke design,and the use of the p/v. Old 2strokes all favored a much larger bore to stroke ratio. But, big bore pro-x cylinders still use triple port exhaust layout..