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Showing results for tags 'top end'.
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What’s the Best Top End Kit for a Bear Tracker?
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Hey there all, First off thanks for the board. My Bayou 220 has survived 3 teenagers and is on its 4th now. Up until recently it has been a virtual tank....until I decided to fix it;) Noticed some smoking from the engine block (not exhaust) so figured it was time for a quick top end rebuild. Now that I have it all back together, it fails to start. I've pulled the starter rope until my arm is tired. So I will be as detailed as possible and hopefully get some help. Completed: -New Head gasket -New Valve seals -New piston (standard) -New rings (standard) -All new seals -Cleaned up head and valves (didn't do any resurfacing, as it all cleaned up pretty easy) -All torqued to spec -Piston ring gaps all checked out -Valve clearances (Intake: .18mm, Exhaust .20mm). Not too tight, not too loose. Pros: -Engine IS making decent compression -DO have spark -Will fire for a split second if I drop some gas in the spark plug hole and pull start. Will NOT from carb and or intake valve. Timing: So I followed the guide of: TDC -Flywheel aligns on the “T” mark on the engine site hole -Cam gear mark aligned with the cover mark Seeing as this is my first time doing a top end rebuild on an ATV. Here are my questions and concerns: -I didn't realize (dummy me) that there are 2 TDC's. 1- Compression, 1-Exhaust. How do I know if I'm on the right one? -Does the cam need to be aligned a certain way when put back in? I just aligned the cam gear dimple with the cam and put it in. No alignment. Thanks ahead of time. I feel like I'm 90% there, but I'm missing an important step for completion.
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In this video, Jonathan describes how he cleaned a Nikasil plated cylinder. Aluminum cylinders are often coated with a harder material such as Nikasil (Nickel Silicon Carbide). Over time, the softer aluminum of the pistons can rub off onto the cylinder. When rebuilding the top-end, this should be cleaned off. This can be done using hydrochloric acid which reacts with aluminum to produce hydrogen gas and aluminum chloride, which washed off with water. Since Nikasil is resistant to corrosion, it is undamaged and protects the cylinder during this process. Here is the chemical reaction: 2 Al (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2 (g) Resurgence Small Engine Inc. ATV, Snowmachine, Motorcycle, & Outdoor Power Equipment