Losing compresson on new SBT 951 - RED thermo DOT

erpa · 09-07-2009, 11:19 PM

Seadoo GTX 2000 ski - 951. Ski is running good so far but no full throttle yet.
Breakin per SBT on 1st tank (oil added to gas - this is an injected ski running seadoo synth). Cold compression was 130 MAG/PTO.
After running on another 3/4 tank, never reaching full throttle. The thermo DOT turned RED (located on PTO top cyc head) and compresson is now at MAG=125 PTO=120. At what temp does the thermo do change color (from tan to red)?

Carbs rebuilt using SBT kits. PO=23psi both carbs and using orig arm and spring and needle and seats.

Plugs look dark in middle electrode and near clean on rim. LeftPlug is MAG, Right plug is PTO.

Second tank did hold sustained 4500rpm for about 20 min on choppy lake tarpon today. Max rpm ~6300 brief.
I work in Clearwater please call my cell anytime 727.560.0855

superjet112x · 09-07-2009, 11:33 PM

I would get ahold of SBT right away.

erpa · 09-08-2009, 09:30 PM

Adding pics of RAVES and pistons. Notice how there is slight scuffing on PTO top pistion (above first ring).
Pics are labled.

Flmike1221 · 09-10-2009, 10:03 AM

Don't disassemble your motor it will void the warranty

SflSwampRat · 09-13-2009, 10:03 PM

taking the valve off is no different than taking the exhaust manifold off.

just dont mess with the SHORT BLOCK.