1980 Yamaha IT250G
Ah, free bikes! This
was a gift in non-running condition. I had a spare Saturday on my hands so, I
took it apart, cleaned it up, put it back together and the S.O.B fired right
up on the first kick! Naturally I raced it the following weekend.
It's slow, heavy, the brakes barely work, the suspension is way too soft and
it's my first 2-stroke so, I got smoked. But, I had a blast racing it and it
was pretty popular in the pits!
1980 Specifications
Engine
| Type | 2-stroke, air cooled, reed valve single |
| Displacement | 246cc |
| Bore & Stroke | 70 x 64mm |
| Compression Ratio | 7.9:1 |
| Carburation | Mikuni VM36SS |
| Ignition | CDI |
| Starting | Primary Kick |
| Lubrication | Pre-Mix 32:1 (I use 20:1) |
| Transmission | 6-speed Constant mesh |
| Final Drive | Chain, 520 x 102 |
| Front Sprocket Teeth | 13T |
| Rear Sprocket Teeth | 48T |
| Spark Plug | NGK B9ES |
Dimensions / Weights
| Rake / Trail | 28 ° / 4.65" |
| Overall Length | 86.8" / 2,205mm |
| Overall Width | 36.8" / 935mm |
| Overall Height | 47.7" / 1,205mm |
| Wheelbase | 56.3" / 1,430mm |
| Ground Clearance | 11.8" / 300mm |
| Dry Weight | 240 Lbs / 109 kg |
Capacities
| Fuel Tank | 3.2 gals / 12 l |
| Engine Oil | .82 L, 10W30 |
| Fork Oil | 326cc, 10wt, 6.5" from top |
Suspension/Tires
| Front Tire | 3.00 x 21 |
| Rear Tire | 5.10 x 18 |
| Brakes | Front and Rear Drum |
| Forks | 43 mm Telescopic Fork w/ 11.8" of travel |
| Shock | Swing arm w/ monoshock & 11.8" of travel |
Performance
| Torque | 26.0 ft-lbs. @ 7,500 rpm |
| Horsepower | 37.12 @ 7,500 rpm (calculated)
Brochure claims 27-44 HP |
Etcetera
Items in ITALICS need to be confirmed
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Resources:
♦ Parts Catalog (local mirror)
I also include aftermarket alternatives as I discover / need them.
♦ Modifications
...Assuming I ever make any. Suspension is high on the list though.
External Links:
♦ Ebay Listings
Vital source of parts for ancient bikes.
♦ Magazine Articles
♦ Yahoo IT Discussion Group
Questions, answers and discussion from other IT riders.
♦ starmtorcycles.com
Factory part numbers for Yamaha's
♦ yamaha-motor.com
Straight form the source.
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RCRAMER.COM
