Useful Information
Supplier: NGK
Type: STANDARD SPARK PLUG
Part Number: B7ES
Gap: 0.6 mm (0.024 in)
The B7ES is in process of being superseded by the BR7ES
Supplier: NGK
Type: IRIDIUM IX SPARK PLUG
Part Number: BR7EIX
Gap: 0.6 mm (0.024 in)
Supplier: NGK
Type: STANDARD SPARK PLUG
Part Number: BR7ES
Gap: 0.6 mm (0.024 in)
Supplier: NGK
Type: STANDARD CARDED SPARK PLUG
Part Number: BR7ES BLYB
Gap: 0.6 mm (0.024 in)
Guides
Engine Oil Type: SAE 10W/30 “SE” Type
Engine Oil Capacity: 650cc (650 Milliliters)
Fork Oil Type: SAE 10W/30 “SE”
Fork Oil Capacity: (per leg) 126cc (126 Milliliters)
Premix
(for engines with the oil pump autolube removed)
Which premix oil should I Use?
The TY175 has an air cooled engine and a such runs hotter and colder than liquid cooled engines. Cold isn’t an issue as the oil can cope with it however at high temperatures the oil needs to provide a good film strength. Synthetic oils generally cope better at high temperatures than minerals oils.
If the bike is ridden regularly and stored somewhere dry then a fully synthetic 2 stroke oil will be fine otherwise use a semi-synthetic 2 stoke oil as it will better protect components from corrosion than that of a fully synthetic oil.
Which petrol to oil ratio should I use?
Use fresh Unleaded (95 RON) petrol rather than a higher octane fuel which performs better in fuel injection systems. The choice of petrol to oil ratio is a balance from having enough oil to lubricate the engine from friction wear and corrosion whilst not oiling up the spark plug, exhaust pipe and causing excessive coking. A correctly jetted TY175 engine being used for trials running semi-synthetic or full-synthetic oil two stroke oil, a ratio between 70:1 and 80:1 can be used. (This is quite a subjective subject so please do your own research and use what you feel best)
Front Tyre Size: 275 x 21
Rear Tyre Size: 400 x 18
Front Wheel Inner Tube Size: 275 x 21
Rear Wheel Inner Tube Size: 400 x 18
Front Wheel Spoke Set: 36 Spokes
Standard TY175 Front Wheel Rim Size: 1.40 which has a total overall width 49.50mm
The offset for the rim is:
Brake Side: 9.64mm
Right side: 25.86mm
(Approximate to within 0.1mm)
Rear Wheel Spoke Set: 36 Spokes
Standard TY175 Rear Wheel Rim Size: 1.85 which has a total overall width of 68.60 mm.
The offsets for this rim is:
Brake Side: 0.2mm
Sprocket side: 57.50mm
(Approximate to within 0.1mm)
Standard Gear Ratio:-
Front: 13T
Rear: 51T
Chain Pitch: 428
No. of Links: 114
From factory the TY175 was shipped with a sprocket ratio of 51/13T (51 rear & 13 teeth font). Changing the ratio is a modification a lot of people do and good start is 51/11T. To calculate the ratio divide the rear by the front (51 / 11 = 4.636). The chain is 428 (pitch) with 114 (links) as standard. If you changed to 520 pitch you would need to change both sprockets and chain.
In theory, increasing the number of teeth on the front sprocket and/or decreasing the number of teeth on the rear sprocket will result in achieving a higher top speed, less torque, lower acceleration and better fuel economy. And vice versa: decreasing the number of teeth on the front sprocket and/or increasing the number of teeth on the rear sprocket will result in lower top speed, more torque, higher acceleration and worse fuel economy.
However, whilst generally true, in practice, this is always the case – mostly due to the power output of the machine at certain revs being higher or lower than at others. Use the following table as a guide only.
Note that some motorcycles cannot accommodate larger front sprockets. Often, the fitting of larger sprockets may require a longer chain.
Lowering the ratio increases top-end speed. Increasing the ratio increases acceleration and bottom-end power.