head work estimate and pistons for G1
afm199 at earthlink.net
Thu Jun 17 19:53:27 PDT 2010
Stock pistons are the best bet. The Spears pistons will destroy a 35k
motor. (Or a 4k motor). Stick with stock pistons.
Hayabusa if you need to go oversize, but you can still get .5mm
oversize stock pistons.
It costs a small fortune to do both heads. 8 valves are $250, guides
and installation are close to $300, labor to pull and replace the heads
is is $300-$450 depending on how the bike comes to me. Then a three
angle valve job will run $300 or so. Pistons and rings are $160-$200
plus honing the cylinders. At 35k you probably need seats reground. In
other words, $1k won't do what you want. Plus I did not cost springs.
Plus you are throwing good money after bad with a 35k SV motor. Find a
used one if you can.
I have a set of low mileage heads I will install for around $500.
On Jun 17, 2010, at 6:03 PM, matthew patton wrote:
> I looked down the intake throat and was greeted with the sight of some
> seriously caked up valves. I'm not interested in spending a ton of
> money ($1000 or rather less) but I would like to get the valves and
> springs replaced, seats checked and finished if needed and possibly
> pistons replaced.
> How much (hours) should it take to remove the heads, replace valve
> train parts (valves, guides, springs) and put back together?
> This is a street machine with 34,000 miles on it. It does see track
> day duty about 5 times a year and did a 4hr endurance race though I
> expect it's track duty to decrease significantly going forward.
> If I elect to replace pistons, what is the BOM associated with the
> Busa option? I see Spears has a high comp kit. Any other reasonably
> priced options?
> I realize any decent mechanic should be able to do the work but the
> short list is Speedwerks in DE and Rick Beggs' RnR cycles in
> Chantilly, VA. Anybody else reasonably local to DC that I should
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