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Post by proam350 on Sept 15, 2014 20:16:46 GMT 1
Hi all I have a 1980 lc350 she cracks the header pipes all time even later type 2 pipes had a set of swarbricks on as well but they wore out on flange fittings bad vibes as well fitted new engine damper mounts still no better tryed to find a later frame with tie bars or scrap frame with tie bar brackets fitted any one any ideas pls
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Post by Delbert on Sept 15, 2014 20:33:33 GMT 1
There is a mod you can do to the rear mounting ,, I done mine ... iirc you remove the steel dowl from the rubber bush & cut it down ,, I got 5mm in me head but stand to be corrected
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Post by Tone on Sept 15, 2014 21:18:08 GMT 1
Found an old Yamaha Service Bulletin that was sent out to dealers ref RD250/350LC Exhaust Gasket Leakage and it suggests to cut the metal collar in the rear rubber mount from 22mm down to 20mm.
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Post by Delbert on Sept 15, 2014 21:53:14 GMT 1
Found an old Yamaha Service Bulletin that was sent out to dealers ref RD250/350LC Exhaust Gasket Leakage and it suggests to cut the metal collar in the rear rubber mount from 22mm down to 20mm. There you go proam350 2mm not 5 .. cheers Tone |
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Post by 4l04ever on Sept 15, 2014 23:13:31 GMT 1
If the vibration is excessive, it could be the crank or flywheel are out of balance, or the crank could be out of true.
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Post by proam350 on Sept 16, 2014 0:44:24 GMT 1
No motor had a full rebuild
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Post by steven on Sept 16, 2014 0:52:24 GMT 1
Hi, As has already been said above, there was a Yamaha Service Information buletin about cutting the collar in the exhaust hanger, I called them "top hats" but im not sure of their correct name off hand. I cut my top hats too, by the reccomended amount. I was sure I had it on my PC amoungst some of the other ones, but cant find it just now, it is on the net somewhere im sure. Here are the other ones I have regarding the exhausts. steven.   |
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Post by proam350 on Sept 16, 2014 14:23:22 GMT 1
Thanks lads will try mod on rear mounts see how that goes if not check crack for trueness
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Post by shane250 on Sept 16, 2014 19:59:31 GMT 1
how do you check for trueness?
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Post by shane250 on Sept 16, 2014 20:19:00 GMT 1
over my head i think.thanks
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Post by slinger on Sept 17, 2014 21:02:26 GMT 1
Like pointed out could be the crank, or how was the clutch assembled? where the steel plates fitted correctly.
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Post by midlifecrisisrd on Sept 17, 2014 21:12:20 GMT 1
You say you changed the rubber mounts, do you mean the ones pressed into the cases.
Did you replace the disc ones that fit on rear right and front left. I take it they are on lo as well as ypvs. Some fit 4 of them.
Steve
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