Just done the wheel alignment (FHTCU) and had to adjust the front link. I took the top link off and released the preload on the front engne mount, then refitted the top link, all by the book. Regreased head bearing and changed all 3 oils plus filter but no other changes.

Bike is fine at speed BUT when slowing down (20-0KMH) I can feel knocking through the rear brake pedal. Bike has Stage 1 and idles a bit uneven; the knocks are definitely engine "spitting". BIke done 50K KMs, you could hear it idle lumpy before but not feel it like you can now.

I'm guessing front engine mount gone - any ideas anyone? (No I didn't drop oil form the filter on the mount - used a plastic bag to catch it all with the filter.

I've read a few posts about rear mount losing rivets etc. Will check that too in the morning.

Thanks in advance

A

 

 

if ya check all ya mounts an they ok have a look in the cam cover an check your tensioners if they ok have a quik look at the cam bearings have had em rattle an cause vibes an once they start they shit big time within few rides an then ya up for heaps
or it could be the flywheels are outta true an the bearings are gettin bad .all these things i said are only maybe if ya check all the logical stuff .ive built heaps of 88 an 96 ect an they dont take much to get bit noisey
if it was fucked mout would do it under accel too if ya get stuck numbers on the left
cheers ron

Ron,

Thanks for that - hope it's not $$$$!

The engine is same as before, it's only the brake pedal vibration that's new. Odd.

Weather bad here so couldn't check mounts today

All ideas welcome!
 

A

most 88 fuck up the cranks within 70k to be honest have done a few for ppl in here an in another 2 forums it could be something simple but normally when threw the pegs it most times motor .try puttin the adjusters back to wat they were mate just to kill some curiosity hey

Finally found the problem!

I had previously fitted a V-Twin Mfg VT-1600 centre stand - it bolts through the "bowtie" cross rail under the gearbox. One bolt was too long and had rested on the gearbox casing; in turn that passed vibrations from the whole rubber-mounted engine/gearbox/swingarm assembly straight into the frame. See photo taken through gap in front of right passenger footrest.

There was c.6-7mm preload so the engine/gearbox was pretty well locked to the frame, plus the top link was out after my first alignment session as it had lifted the right side of the engine up = top across to left. The re-alignment must have made a marginal situation into a noticeable one; the adjustment pushed the right side back, increasing the preload.

View looking up through the bowtie showing scratches to gearbox casing.

Shortened the bolt - re-aligned bike - no more unusual vibration via the brake pedal and much reduced running vibration too (now that the rubber mounts are free to move).

Moral of the story - don't trust anyone (inc MoCo) to make accessories that fit properly!

Thanks for all the comments.

A