|
|
Post by blacklav on Mar 12, 2014 14:41:56 GMT -5
Anyone in the UK have a spare serviceable exhaust valve for sale. I have a bent one. Having a rebore and found this bent one while lapping them in. No wonder the compression was low. Its for a 1977 xs 650 D model. ## Thanks |
|
|
|
Post by grizld1 on Mar 12, 2014 18:40:26 GMT -5
You'd be well advised to install a new valve, but new or used, be sure to check clearance between valve stem and guide when you get the replacement; the guide could have been damaged.
|
|
|
|
Post by blacklav on Mar 13, 2014 13:26:57 GMT -5
I`m with you on that grizld. After measuring all the valves and stems they are outside the tolerances.
Don't know what caused the bent valve, no marks on piston. Could have been like it some time as ive only owned it 3 months.
Where do you get valves and guides from in the uk?
Thanks.
|
|
|
|
Post by madmax on Mar 13, 2014 17:03:41 GMT -5
OEM Yamaha are available but will cost you around £360 for 4 valves and 4 guides, try Jerry Heiden in Holland, he can do the full set with aftermarket stuff for around £200 (240-250 euros), take a look on ebay using the worldwide search, there's a fair amount of NOS stuff on there at "sensible" prices (like £20-25 each inc postage).
Good luck
Max
|
|
|
|
Post by grizld1 on Mar 13, 2014 20:32:09 GMT -5
Right, some of Heiden's stuff is OK, but stay away from the stainless steel valves; they're the same ones sold by Mike's XS, and they've caused a lot of trouble, from undersized stem diameter to breakage. Get the old guides out before you order new and have the holes measured so you'll know whether or not an oversized guide is needed to achieve a proper interference fit. Refer to the appendixes in the factory manual for specs; you can download it free from www.biker.net. There's far less risk of deforming the hole in removal if you clean the guide carefully first and get all the carbon off. Oven cleaner can help with that. |
|
