I'm new to the forum. Just bought a 2005 919 with 11k miles on it. Brought it to the dealer to have the fork seals done, brake pads replaced and a new front wheel put on. I had only done a low speed test drive prior to buying the bike (mistake I know) and am now noticing that once the bike gets above 40 mph it shudders every few seconds. It does this whether I am accelerating or have the clutch all of the way in and it does not go away if I try to shift out of it. It feels like going over small road imperfections every few seconds but I know that isn't it because I have tried it on various qualities of pavement. My initial thought is that it might be a tire balance issue. Any ideas?
Could be a tight spot on the chain too, binding and giving an intermittent vibration; could be the chain is too tight overall.
Easy enough to check these things - get the back wheel off the ground and spin it by hand to see how smoothly everything rotates; sit on the bike with all your gear on and get someone to check the chain tension for freeplay - the toe of a boot should be able to flip the chain up a bit.
I think the first question is why it needed a new front wheel? Assuming that that was damaged, something else could have been damaged too
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-2009 Suzuki GSX-R 750 Race Bike
-2007 Honda 919
-1995 Nighthawk 750 (Tboned)
-1983 KZ 440 (Sold)
Thanks everyone. I'll check the chain out. Front tire needed to be replaced due to dry rot so luckily nothing more sinister than that!
Let us know what you find with the chain inspection per recommendations above. If you don't discover the problem with the chain look at the rear tire and inspect for balance and check the tire for age cracks and look at the build date on the side of the tire. We see the front is new - the rear may have issues that are not so obvious. Make sure the tire pressures are proper and check that the wheels are aligned.
Also look at the brakes and check for wear and pad dragging. Look at the brake fluid and make sure it's clear. If you don't know the service history then change the brake fluid and properly bleed the system. (It's real simple on the 919.) Old brake fluid will have absorbed water and that can cause problems when the brakes heat up.