Thread: New R&D Engine Components
01-20-2010, 12:17 PM #1
New R&D Engine Components
Valve Spring Kit
Retainer cups needed for R&D valve spring install
Valve Stem Seal Kit
Valve Stem Concentricity Gauge
High compression pistons
01-20-2010, 05:25 PM #2
01-20-2010, 10:45 PM #3
Didn't I read somewhere that cams were also going to be available or was I smok'n crack?
01-20-2010, 10:53 PM #4
they are seriously hinting at a new cam in those descriptions. looks like a good year for this motor
01-20-2010, 11:19 PM #5
01-20-2010, 11:27 PM #6
01-20-2010, 11:33 PM #7
01-20-2010, 11:34 PM #8
- Join Date
- Jul 2007
valve ste tool
It checks if the valve stem is true and round. If not the valves
will not travel in the valve guide smoothly.Its more a workshop tool
for rebuilding engines.
01-20-2010, 11:35 PM #9
I would be seriously surprised if yamaha built this thing with bad valves. they have been making high rpm 4 strokes for a long long time. the motor that this replaced spun 10,000+ rpm in the watercraft version. the sport bike version was even highter.
01-20-2010, 11:41 PM #10
Quite simply, its a roundness/straightness tester. Small valves can be easily tweaked/bent from heat,especially on charged motors, or slightly bent even when new isnt unheard of, and to the naked eye its hard to see.
This makes sure the head of the valve is concentric (round), and paralell with the stem of the valve for a perfect seal on the seat.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By AndyW in forum Conversion PWC Performance SkisReplies: 7Last Post: 06-14-2010, 09:44 PM
By Fercho in forum Yamaha How To & FAQsReplies: 2Last Post: 07-13-2008, 12:09 PM
By 800AMSOIL4U in forum Polaris Open DiscussionReplies: 17Last Post: 01-21-2008, 10:15 PM
By holdnon72 in forum 4-Tec PerformanceReplies: 32Last Post: 04-20-2007, 09:37 PM
By camar0 in forum 4-Tec PerformanceReplies: 31Last Post: 04-10-2007, 11:05 PM