5 replies to this topic

[slowmatt]

Hi Guys

I am hoping someone can give me some advice as to what could be causing what I would describe as excessive vibration from the engine on my 2007 Rev 3 250. The bike always starts and runs fine but I have noticed for some time that there is excessive vibration felt through the frame/pegs which gets increasingly worse at higher revs (both in gear and neutral) which is particularly noticeable when riding between sections.

When I bought the bike the waterpump seal had been changed by the dealer but I found that the coolant was mixing with the gearbox oil. When I investigated I found that the replacement seal fitted by the dealer was not seated properly in the housing so I replaced the seal and since this time this issue has been cured.

My fear is that when coolant was being lost the bike could have overheated and I am wondering if this caused the vibration problem as I do not remember it being an issue when I got the bike.

Any suggestions as to potential causes and anything I should check would be much appreciated.

[Outlaw Dave]

Check the engine mounts, especially the rear, and also the bash-plate bolts, before you do anything else.

[NZRalphy]

+1 all the engine mounts and ...... + exhaust mounts and...... +frame bolts

[betabonkers]

My mate had vibration through the footpegs and it was his main bearings.

[slowmatt]

I have checked all the engine mounts and they were all tight so looks like I am going to need to strip the engine down and check the main bearings. Many thanks for your comments I will report back my findings

[pindie]

I had the same issue with a YZ250 crosser. It was a very old tired dog when I got it (1995). It was a cheap scare myself bike until I had the same as you. An obvious thumping through the frame and footrests. I called it a day and stripped the motor. Very glad I did as the big was seriously slack.

Re built with new bearings etc the bike gave me many years of good service and abuse.