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I picked up an '01 TTR225 today to use the top end and crank for a stroker.
Kind of a cheesy motorsickle, actually, even by TW standards. Or at least cheesy in different areas, better in some others. The TTR has a better airbox and general component layout than a TW, IMO. etc. But a dedicated offroand bike without a kickstarter? Not on my watch.
It does have some cool features and parts that can be used either to improve a TW or are identical items if you're in need of parts. Some are fairly common knowlege by now, others less so. As I part it out I'll make note of these as best I can. Some things like the carb and fuel tank probably have clearance issues on a TW, so I'll slap them on one of my frames to check.
XT225 models will share more parts with ours. If I ever get my hands on one I'll try to do another post.
I'll update by editing in this window, so if you're interested check back, as that method doesn't return the topic to the top.
What's hot:
Most folks know by now that the crank, barrel and piston and head can be swapped into a TW to produce a 225. Cylinder can be used alone on a TW to allow overbores with the TW crank up to 72mm, or the entire engine can be swapped into a TW but you'll still have to split the cases and install the TW transmission.
Stainless steel headpipe- direct swap. Here's one all cleaned up. I'll have to dull this one up a bit, cuz I'm The Antichrome:
Kickstand- 1 inch longer than TW. Direct swap
Master cylinder-identical to TW. Rubber plug in brake switch hole, but it's there.
Brake line- 3 inches longer
Clutch lever perch-identical to '01-up TW. Has rubber plugs in the mirror hole, uses same safety switch. Cable not the same as the TTR clutch arm operates from the left.
Remote cable-operated choke- operates by a knob at the bars. Standard Mikuni plunger, need to verify if it TK thread is the same.
Skidplate-pretty cheesy, but aluminum. Better coverage than a TW plate, but no tougher. Fits with the TW rear hook bolted onto it. Has a nice ventilated rubber cushion between it and the crankcase, not a bad plan for a TW.
Handlebars- Same as ours.
Fuel petcock- Fits our tanks. Has a big, chrome easy-grab knob that looks like it came off yer grandma's stove. Ronnydog has one on his XT txnk. I gotta measure the fuel reserve.
Shift lever- folding-tip style. Fits.
Rear sprocket guard-same
Rear brake arm- Fits. More leverage.
Snail adjusters- Same. In fact all Yamaha snails appear to be identical.
Foot pegs- Fit. Aprox. 1" longer, but same width.
Fuel tank- 2.8 gallons, if the factory is correct. Some people have done the oversized Clarke versions of this tank on a TW.
What ain't ( or in some cases could be, but with major alterations):
Rear shock: The TTR uses a linkage and therfore the spring is way too wimpy to run direct. The shock is 14.5" long, putting it in nosebleed territory in terms of ride height. HOWEVER it is fully adjustable and is the first shock I've encountered which will readily accept a stock-length TW spring without a spacer.
Left footpeg mounting bracket- With careful layout and redrilling it COULD be used to correct the rearward offset of the left peg, which drives me nuts on long rides. I end up with my heel parked on that peg and the middle of my foot on the other.
6 speed tranny- The TW ouput shaft can be machined to accept the gear stack. two of the gears are thinner requiring a custom spacer and a snap ring groove to be cut into the shaft. Fairly involved and not cheap, but doable.
Kind of a cheesy motorsickle, actually, even by TW standards. Or at least cheesy in different areas, better in some others. The TTR has a better airbox and general component layout than a TW, IMO. etc. But a dedicated offroand bike without a kickstarter? Not on my watch.
It does have some cool features and parts that can be used either to improve a TW or are identical items if you're in need of parts. Some are fairly common knowlege by now, others less so. As I part it out I'll make note of these as best I can. Some things like the carb and fuel tank probably have clearance issues on a TW, so I'll slap them on one of my frames to check.
XT225 models will share more parts with ours. If I ever get my hands on one I'll try to do another post.
I'll update by editing in this window, so if you're interested check back, as that method doesn't return the topic to the top.
What's hot:
Most folks know by now that the crank, barrel and piston and head can be swapped into a TW to produce a 225. Cylinder can be used alone on a TW to allow overbores with the TW crank up to 72mm, or the entire engine can be swapped into a TW but you'll still have to split the cases and install the TW transmission.
Stainless steel headpipe- direct swap. Here's one all cleaned up. I'll have to dull this one up a bit, cuz I'm The Antichrome:

Kickstand- 1 inch longer than TW. Direct swap
Master cylinder-identical to TW. Rubber plug in brake switch hole, but it's there.
Brake line- 3 inches longer
Clutch lever perch-identical to '01-up TW. Has rubber plugs in the mirror hole, uses same safety switch. Cable not the same as the TTR clutch arm operates from the left.
Remote cable-operated choke- operates by a knob at the bars. Standard Mikuni plunger, need to verify if it TK thread is the same.
Skidplate-pretty cheesy, but aluminum. Better coverage than a TW plate, but no tougher. Fits with the TW rear hook bolted onto it. Has a nice ventilated rubber cushion between it and the crankcase, not a bad plan for a TW.
Handlebars- Same as ours.
Fuel petcock- Fits our tanks. Has a big, chrome easy-grab knob that looks like it came off yer grandma's stove. Ronnydog has one on his XT txnk. I gotta measure the fuel reserve.
Shift lever- folding-tip style. Fits.
Rear sprocket guard-same
Rear brake arm- Fits. More leverage.
Snail adjusters- Same. In fact all Yamaha snails appear to be identical.
Foot pegs- Fit. Aprox. 1" longer, but same width.
Fuel tank- 2.8 gallons, if the factory is correct. Some people have done the oversized Clarke versions of this tank on a TW.
What ain't ( or in some cases could be, but with major alterations):
Rear shock: The TTR uses a linkage and therfore the spring is way too wimpy to run direct. The shock is 14.5" long, putting it in nosebleed territory in terms of ride height. HOWEVER it is fully adjustable and is the first shock I've encountered which will readily accept a stock-length TW spring without a spacer.
Left footpeg mounting bracket- With careful layout and redrilling it COULD be used to correct the rearward offset of the left peg, which drives me nuts on long rides. I end up with my heel parked on that peg and the middle of my foot on the other.
6 speed tranny- The TW ouput shaft can be machined to accept the gear stack. two of the gears are thinner requiring a custom spacer and a snap ring groove to be cut into the shaft. Fairly involved and not cheap, but doable.