Most Read Technical Articles
- Technical Article List
- OILS: 2 Stroke Vs. 4 Stroke Synthetic vs. Non-Synthetic
- Carb Sensitivity and Pipe Bang
- DUAL RING PISTONS VS. SINGLE
- Polaris CFI-2 Pistons and how long you should let it "Warm Up" (controversial)
- Cranking Compression Vs. Octane Requirements
- Polaris Piston Myths vs. facts and "Fix Kits"
- Is your clutch lying to you?
- DOES YOUR FUEL INJECTED SLED REALLY NEED A FUEL CONTROLLER? ARE THE PRE-PROGRAMMED CONTROLLERS OFFERED REALLY RIGHT FOR YOUR ENGINE?
- Torque-Line 600/700/800 Ski-Doo Head Instructions
827 (172HP)Big Bore Kit
827 (172HP)Big Bore Kit for Ski-Doo 800 Twins
PLEASE NOTE: You will need to CALL for this kit and you must send in your cylinders and valves in order for this kit to be completed.
RK Tek Has developed an 827 (REALLY an 830cc) kit for the 2001-2007 800 Twin Engine. While we were not planning on big performance improvements in this little over-bore... we were soon proved WRONG! In side by side (stock 800 pipe) bench-mark testing against our RKT Mod 800 Engine Kit .. the 827 would pull 5 lengths on the hills and flats over our modified 800. This came as a HUGE surprise to us but the results do not lie. We were very pleased to say the least!!
This kit, on a 2001 MXZ 800 was dyno'd in 2005 at Dyno Tech Research in New York and showed 166.8HP with the STOCK Pipe and can. That is over a 40HP gain from the 2001 engine's power (124-130HP) For more on this kit and that dyno session please visit www. dynotechresearch.com and read a bit more .
RK Tek further developed this kit to reach 172HP(ported version). The kit in its non ported state WILL deliver 163HP
Now this kit has been in existence for over 10 years and has certainly withstood the test of time!! There are 100's of them out there running and running very well. After 10 years, there are really no more variables or "surprises" the kit REALLY is that SOLID!!
HERE is an EXCELLENT REVIEW on the RK Tek 827 Kit from a NON-BIASED Professional Tester. Check it out see what they had to say about it: 827 REVIEW and https://www.youtube.com/user/lshobie/videos
This 827 kit is unlike all other big-bore kits. It uses your stock cylinders and does not require sleeving the cylinders. When you sleeve the stock cylinders.. transfer tunnel area is GREATLY diminished. This is not a good thing! One of the short-comings of the Series III engines is the transfer tunnel area... IT IS NOT LARGE ENOUGH! Proper porting can partially resolve this short-coming BUT once you sleeve the cylinder.. the tunnel area is greatly diminished and can NOT be restored. Aftermarket cylinders can address this issue but are quite expensive!
The cost of the kit is as follows:
|Strip/Bore/Re-Plate stock cylinders (2)||$525.00/pair|
|83.5mm CUSTOM MADE pistons with wrist pins and rings||$370.00/pair|
|Custom RK Tek Billet Head||$465.00 complete|
|Custom Base gasket||$25.00|
|Modification of RAVE valves||$75.00/pair|
|TOTAL||$1445.00 (163HP Version)|
Options-- Great addition but NOT required!
The engine's port timing is drastically altered due to the piston's unique geometry. So, even if you choose the non-ported 827 kit, the porting is drastically altered.
Full cylinder port: (CNC PORTED) $600/pair
Caged wrist pin bearings $40/set
MPEM Recurve (HIGHLY RECOMMENDED) $160.00