1990 90etld Reeds/water passages

JDHNWFL

Cadet
Joined
Jul 26, 2009
Messages
10
After fighting WOT hot condition I finally broke down and pulled the head and exaust manifold to look for blocked water passages and found some. It looks like there may be some small holes under the exaust manifold into the cylinder waterjacket. I am wondering if anybody knows how many and what size drill bit to use ? Should they be opened up a little bit? Also wondering if anybody has used after-market reeds. I use Boysen reeds in my dirt bikes and think in that app. they are worth the $. Any thoughts would be helpful. Thanks.
 

GrayBlue

Cadet
Joined
May 14, 2011
Messages
27
Re: 1990 90etld Reeds/water passages

Not sure about the reeds, I would get the yamaha part # and put it in google and see what comes up.

As far as the drilling into the water passages, are you drilling through corrosion? If so, why not soak in a vinegar/water solution for an hour and scrape it away?
 
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