20 Most Recent 1998 Yamaha YZF-R1 Questions & Answers

Question edited for clarity to add maker and the rest of the model! Question moved from Cars and Trucks to correct category. 1998 and 1999 are the same bike. From 2000 the engine management system was changed. https://en.wikipedia.org/wiki/Yamaha_YZF-R1 ..

Should be easy enough as a 1998 Yamaha R1 already has a 6 speed gearbox as stock

Depending on the climate that you live in. Cold temps SAE10W30SE to hotter climates SAE10W40SE. Hotter climates still and if you can find it 20W40 and 20W50 Off hand, don't know the size of the crush washer. I assume this is for the oil pan drain plug. They are of a very common size and freely available at just about any motorcycle parts store. They are an aluminium washer, not a copper crush one. I've actually never replaced one ever and have never had a leak. If they are a little deformed you can sand them lightly to even them out.