HifloFiltro - Air Filter: Honda FES250 FES 250 (1997) Triumph Thruxton 900 If you're having spark issues

If you're having spark issues (weak or no spark) with your Yamaha YZF R1 then the ignition coil / coils could be the culprit and it may be worthwhile changing your ignition coils for brand new high quality replacements

and why not upgrade for the small price difference

It is 90mm from centre to centre with 2 spade connectors and 2 HT leads leading to all 4 cylinders

You can use your old one

Kawasaki KLR 600 (KL600 B) (1985-1994)

HifloFiltro - Air Filter: Honda FES250 FES 250 (1997) Triumph Thruxton 900 If you're having spark issuesBrand New air filter to fit: Honda FES250 Foresight (1997). This is a high quality air filter manufactured by Hilflofiltro. This air filter has been manufactured to meet or exceed the manufacturers genuine part on a Honda FES250 for the years and models shown above. To replace OEM: 17210 KFG 010. HifloFiltro part number: HFA1211. HifloFiltro Providing unbeatable performance and exceptional value, Hiflofiltro is the best selling brand of aftermarket