200x speed

[fishy_inn]

How fast is the 83-85 200x? What are some hop ups for it that you are happy with? Not anything major, just some more power. What would be some good tires for mostly trail riding in loose dirt. A little bit of mud also.

[speed20]

i have an 84 200x and im guessin it will do around 53-57mph possibly....could be wrong.....Pipes will add some power, lowering gears will add some bottom end power.

[Yamaha_Rules69]

I think you can buy high performance air filters for it. They are supposed to give it better air flow, and increase HP. I thought I saw some in the Dennis Kirk catalog ranging from $20-$50. That would be a pretty good step up for a low dollar.

[speed20]

yeah i never thought about my air filter....i have a K&N, seems to let air flow better.... i heard advancing your timing a little bit gives you more power too....im not all sure about that one though.

[250Rstud]

me and 85200xer have 3 200x's and we clocked them next to his mom's toyota, they only did 50 mph ,TOPS. and that was rapped completely out.

I think that the lumber jacks are good all around tires for snow, mud, dirt, anything. I have them on all of my trikes.

[Levithan]

hmm, well i havent timed mine yet, but the dude who i bought it from sed it tops out at 65. It has a homemade pipe on it that is shorter than anything i've ever seen, and its hella loud. Sed to increase top end. Think its true?

[200xer]

Yes that will increase top end, possibly too high so it's out of the RPM range. Adding HP will not change the top speed. Adding HP while changing the gearing will change top speed. More HP will get you to top speed a lot quicker with stock gearing. My 200x must only move about 40-45, but that's because of the 18" tires. I like Turf Tamers and the simple flat knobbies (not balloon). They are cheap tires and do a good job. I wouldn't go any smaller than 20" in the back though. I bottom out on my frame over jumps with my 18's.

[3WheelsForever]

Hey guys, what about an 86 200x? I know they performed better than the 85s but I am just wondering how much faster. I am getting one perty cheap and will have some money left over so I am planning to spend that money on modifications. If I bored it out like .50 over whats your guesstimate on the top speed? Thanks guys.

[200xman]

I will let you know tomorrow. i have an 86 200x with a .50 ovew Wiesco 10.5 to1 piston, K&N in the stock air box and a DG RCM exhaust.. I finally got it jetted in and will check the top end tomorrow. It has stock gearing and 20" Fast Trekkers on the back.

[speed20]

if you bored it .50 over.....you wouldnt go any faster, you would just have more bottom end power i believe....to go faster you must change the gear ratio...... .50 over would make it get hot REALLY quick...believe me, my 84 200x is bored over 50 (only reason was because the scratches on the cylinder was that deep)

[ATCRYDER]

83-85: 50-58mph

86/87: 60-65mph

[DixiePlowboy]

200xer,
I have to disagree with you. Increasing horsepower alone can increase top speed, all other factors being equal. A magazine test back in '85 compared exhaust systems that were available at the time for the '83-'85 200X. The speeds were clocked with a radar gun, and ranged from the high 40's to the low '50's, depending on the system.
I owned an '85 YTM 200ERN back in the day that had a Kerker exhaust and an aftermarket cam in it. The Yammie was shaft driven with the stock balloon tires. A friend with an '85 200X(aftermarket exhaust otherwise stock) and I raced a distance of about 3/4 of a mile repeatedly. He was quicker up till we hit 5th gear, at which point I caught him, passed him, and pulled away putting about 10+ bike lengths on him at the finish.
The cam alone gave me the advantage of having more power left at high RPM's to pull higher top speed, and helped me pull right on by a machine that a stock Yamahauler shouldn't beat on top speed.

[DixiePlowboy]

200xer,
I have to disagree with you. Increasing horsepower alone can increase top speed, all other factors being equal. A magazine test back in '85 compared exhaust systems that were available at the time for the '83-'85 200X. The speeds were clocked with a radar gun, and ranged from the high 40's to the low '50's, depending on the system.
I owned an '85 YTM 200ERN back in the day that had a Kerker exhaust and an aftermarket cam in it. The Yammie was shaft driven with the stock balloon tires. A friend with an '85 200X(aftermarket exhaust otherwise stock) and I raced a distance of about 3/4 of a mile repeatedly. He was quicker up till we hit 5th gear, at which point I caught him, passed him, and pulled away putting about 10+ bike lengths on him at the finish.
The cam alone gave me the advantage of having more power left at high RPM's to pull higher top speed, and helped me pull right on by a machine that a stock Yamahauler shouldn't beat on top speed.

[200xer]

speed is determined by your gear ratio (tranny and sprocket size), RPMs, and tire size. It doesn't matter if you have 10 HP or 100 HP, if those 3 factors are the same you will not go any faster.

[DixiePlowboy]

If you think you can't gain any top speed through improvements in horsepower with stock gearing, you're very mistaken.
Improvements in top speed don't come as easily as improvements in acceleration admittedly.
The factors that limit top speed are horsepower, gear ratio, and aerodynamics(to a much lesser extent on slower machines though).
You'll have a hard time finding someone with a 13/39 geared, 20" tired 250R running a 300cc+ stroker on alky that can't pull away HARD from a topped-out stocker.
The Yamaha in my previous post had power at higher RPM than a stocker due to the cam and exhaust. It did run several MPH faster with the same gearing, just as the 200X in the magazine exhaust-shootout did with nothing more than an exhaust system change.

Just the facts man....just the facts.

[HemiChallenger71]

Plowboy's right...

[lushatc200x]

i hope my 10:1 compression piston helps my bike

[JasonNO2/200x]

I have an 84 200x. I also have a radar gun. I only had enough room to run to the top of fourth gear. Speed with Supertrapp was 48 mph in top of fourth. Speed with DG was 54mph in top of fourth. Everything else was stock.

Jason

[xman23]

yea changing sprokets gives you most of your top speed increase, personally I think 200x's came geared to low, they have them geared for 22 inch tires, but theres not a whole lot of people running 22's, In mine i have a webb cam, supertrapp pipe, high comp piston and its got preety good power for what it is. I cahnged my gearing alot becuase I do alot of higher speed riding, so i put a 35 tooth in back and that made a huge difference

[saturnshadow]

So i wonder what a 84 with full race megacycle cam, 12:1, C12, 28mm flatslide, ported head and xr 6 speed would do.

[cowmilker]

Putting a bigger cam in/better exhaust will increase maximum RPM, giving you more power at higher rpm. So RPM x gear ratio x tire size = max MPH is correct!
Also HORSEPOWER (ie. same engine with the ability to run at a higher RPM) x gear ratio x tire size = max MPH is also correct!:rolleyes:

[LukeDukem]

hp question too
dennis kirk offers 4 types of exhaust, 2 that are DG and 2 cobra, does anyone know which is the quietest out of the four, its for a 84 200x

[crazyratt]

Just out of curosity you all said going .50 over will make it run hot. my 84 200x is bored 1.50 over. should i look for certain things if it gets to hot. also it has amazing low end but the top end is not to big of a differance if any. then again the piston and rings were so bad i was blowin a qt of oil every 200 yds.

[JasonNO2/200x]

I would say that you need to resleeve your bore. The stock sleeve is only 3mm thick, if you bored it out 1.50mm you just took away half of the material. I am building a 84 200x motor right now and I am putting a new sleeve in to retain the stock thickness. If you are losing that much oil I would check your compression it could be that you cracked your sleeve with it being that thin.

My motor is:
Weisco 67mm 10.25:1 Piston
Forged Rod
2mm overbore sleeve
Webcams Custom NO2 grind
Intake/exhaust valves are 2mm oversized
Hardened bronze seats
Heavy duty timing gear and chain
Head Ported and polished
Performance race valve springs
Custom made billett aluminum intake
28mm DG Carb
DG Xcelerator Exhaust
Wet NO2 Kit 8hp/16hp shot
And a variety of gears
Adjustable timing module
Progressive NO2 Controller
Custom clutch to handle the power.

I also have a stock motor that I swap out with for different riding that I do. I have also thought about putting in a 6 speed but I have heard and read about some strenght issues with the 6 speed gears. So that is up in the air right now.

Jason

[crazyratt]

that was before i bored it out. runs like a champ now. i am thinking of just runnin it now and getting a motor of eay or something and rebuilding it. then over the winter rebuild the hole damn bike. it was outside for 4 years before i got it, its bad it started as 65mm and you said you have 70mm, mines only 66.50 now or did you do some other things.

[DixiePlowboy]

Dang Jason!

Talking about a wicked X there.