Thoughts on putting 6 speed transmission in 200x.

[bandito90]

I'd like to get opinions on putting a 6 speed trans in a first gen 200x. I know the sixth is basically an overdrive and first through five are the same gear ratios in the 200x.
Besides really long wide open areas. will it be worth putting in. I'm currently building a 200x that will not be an all out race bike. Big bore cam and exhaust will pretty
much be the motor work done.

Thanks

[tri again]

Sounds interesting.
Would love to hear more.

[rg97]

Unless you create your own complete transmission your best bet is to get an XR200 transmission which was 6 speed and will fit in 200x cases with some modification. With some work you can fit an XR200 6 speed tranny in there.
You have to be careful too because with an engine making more power (big bore, cam and exhaust like you said) the thinner gears will break easier. A 6 speed is a definite no-no for a stroker crank because of the HP but with just those mods that you want you may be OK. Someone said that they thought shortline had done it before, maybe he will chime in.
Prepare for it to be expensive

[rg97]

A quick eBay search brought up a bunch of complete 6 sp. XR200 transmissions about $100+. So count that in plus sending it somewhere to do the custom work (maybe? some said you need to, some said you dont, so IDK ), or be brave enough to do it yourself. I do not know what all needs done though.
When I looked through the XR and X transmission and drum parts diagrams nothing really is the same but the parts may fit either cases
And it turns out that Only certain years cross over. The 84-85 had a different design than the 86+ which are the years that work.

You can use the XR gears, selectors and forks in your standard cases or use the XR cases as they are the same as the '83 - '85 200X cases.
I found the six speed useful for a high revving engine but with a stroker stick with the five speed.

[the great gazoo]

Methinks you might have the XR200 transmission already, Timmy?

[RoscoW]

I put a 6 spd in my wifes 85 200X, used a transmission gear set from an 83 XR. Other than the tooth count on the kicker gears it's a straight across swap. 1st thru 3rd are identical ratios, and the final ratio ends up at .815:1 on the 6 spd vs .923:1 on the 5spd. that difference is spread over 4th, 5th and 6th. With dropping to 20" tires, top speed probably didn't change but the spacing seems perfect.

Build thread, sorry for the lost pictures
http://www.3wheelerworld.com/showthr...her-full-build

[hillbilly 200x]

I love my 200x now that it was a six speed in it. It's so much nicer when you have to do any road running. I rode the crap put of it last year and i never had any issues with it. Mine was bored out to a 202 cc with xr cam ported head 30 mm carb open air box and supper trap exhausted trust me I didn't ride it easy. In one of my old threads short line did post and say that the 6 speed is weak and wouldn't hold up with a fully built engine.

[bandito90]

So it seems everybody who has done the swap seems to like it. I do have an xr200 motor already.I have to split the cases on my 200x to fix the slipping kicker gears.Thought it would be a good time to do the swap.As far as strength I know guys put stroker
cranks in the XR200.

[hillbilly 200x]

^^ Yes they have but they only had to turn one tire that is only a few inches wide not two tires that are 10 - 12 inches wide.

[barnett468]

The following is just an example [not exact numbers] of what you can expect.

If you leave your engine stock, and put in the 6 spd, your top speed will increase by around 6-7 mph.

If you add the performance upgrades like cam and pipe etc., you will likely have less bottom end hp/tq but your eng will turn more rpm which will make 1 thru 3 gears seem like they are farther apart when shifting at max rpm. It will also increase top speed by around an additional 4-5 mph due to the increased eng rpm.
To compensate for the wider gear feel, potential loss of bottom end perf [created by the upgrade] and to increase acceleration rate, you can change the gear ratio by increasing the rear sprocket size around 3 teeth or reducing the front sprocket by 1 tooth etc..
What this does is improve bottom end perf and bring the gears closer together, but still provide for more top speed than you currently have if geared properly.

The higher the sprocket ratio is, the lower the load/stress is on the gears.

Installing smaller diameter tires like RoscoW did will do the same thing as increasing the sprocket ratio.

[Toaster556]

Unless you create your own complete transmission your best bet is to get an XR200 transmission which was 6 speed and will fit in 200x cases with some modification. With some work you can fit an XR200 6 speed tranny in there.
You have to be careful too because with an engine making more power (big bore, cam and exhaust like you said) the thinner gears will break easier. A 6 speed is a definite no-no for a stroker crank because of the HP but with just those mods that you want you may be OK. Someone said that they thought shortline had done it before, maybe he will chime in.
Prepare for it to be expensive

Where are you getting that information? I know of more than one XR200, ridden hard with a sticky trials tire and a stroker crank. I also have seen a Powroll 240 kit (stroker crank, 70 mm piston) thats been ridden hard, put away wet and still the stock six speed. Yes, the Powroll stroker needs to be notched for a six speed, but Ive been around XR200s in many forms for a long long time and rarely have seen any transmission issues.

[rg97]

Like someone else said, an XR200 has to turn a thin piece of rubber that weighs next to nothing compared to a pair of 11" tires on a 200x. Xr200's weigh less overall too. More stress on all transmission parts hauling more wieght and rotation more mass

[fabiodriven]

Like someone else said, an XR200 has to turn a thin piece of rubber that weighs next to nothing compared to a pair of 11" tires on a 200x. Xr200's weigh less overall too. More stress on all transmission parts hauling more wieght and rotation more mass

What I want to know is if you're speaking from experience or speculating (again)? I've been watching this just to educate myself, but I'm sure the OP is looking for the most accurate information he can get.

[slashfan7964]

What I want to know is if you're speaking from experience or speculating (again)? .

Why does it matter?

[fabiodriven]

Because I'm looking for facts from people who know, not the opinion of a kid.