The Coleman 196cc Mini Bike has become a popular entry point for riders and DIY enthusiasts alike. Known for its affordability and ease of modification, the engine often sparks curiosity about upgrades and maintenance. A common question among owners revolves around the compatibility and durability of engine components, particularly the camshaft. This article delves into the discussion surrounding camshafts in the Coleman 196cc engine, drawing insights from experienced mini bike enthusiasts.
Many owners considering modifications for their Coleman mini bikes often look at readily available parts from similar engines. One such engine frequently mentioned in forums is the 212 Hemi Predator. A key question that arises is whether parts, specifically camshafts, are interchangeable between these engines. Enthusiasts often wonder if the 212 Hemi camshaft can be used in the Coleman 196cc engine, especially to address concerns about the stock plastic cam gear found in some Coleman models.
The good news for those looking at this swap is that the Hemi camshaft is indeed compatible with the Coleman 196cc engine. According to experienced builders, the journal sizes are the same, making it a direct fit. The non-Hemi 212 cam has a slightly larger journal, but the Hemi version aligns perfectly with the 196cc. This interchangeability opens up options for owners wanting to replace the plastic cam gear with a metal one for perceived long-term durability, even without aiming for performance enhancements. The stock camshafts in both the Coleman 196cc and the 212 Hemi engines are reported to have similar specifications, with a lift of around .224″ and a duration of 228. This means swapping to a stock Hemi cam is a straightforward process without requiring changes to tappets, assuming they are metal and in good condition.
While considering camshaft swaps, it’s also worth noting the performance potential of the Coleman 196cc engine. Despite being seen as a smaller alternative to the 212, the 196cc is considered just as responsive to modifications. Experienced builders have highlighted that the 196 engine can be built to be highly performant, even rivaling larger engines in certain aspects, particularly at higher RPMs. The choice between modifying a 196cc or swapping to a 212cc often comes down to personal preference and specific performance goals. For those starting out or wanting to retain the original engine, the 196cc offers ample opportunity for upgrades.
However, some Coleman 196cc mini bike owners have reported experiencing significant engine vibration. This can be a concern, affecting ride comfort and potentially indicating an imbalance within the engine. While some suggest that the plastic cam gear might be a point of weakness, others point towards potential balancing issues within the engine itself. One suggested solution to address vibration, and potentially increase displacement slightly, involves using a 212 crankshaft in the 196cc block. This modification, utilizing the longer stroke of the 212 crank, could create a “stroker” engine around 200-201cc. This approach requires careful measurement of piston-to-deck clearance and consideration of head gasket thickness to ensure proper compression and engine operation.
For riders experiencing excessive vibration or considering more significant engine work, another option mentioned is exploring a GX200 engine. Known for their reliability and smoother operation, GX200 engines are often seen as a robust alternative. Whether opting for a cam swap, exploring stroker modifications, or considering a different engine altogether, understanding the nuances of the Coleman 196cc engine allows mini bike enthusiasts to make informed decisions for maintenance, upgrades, and achieving their desired riding experience. Ultimately, for those seeking long-term durability without immediate performance boosts, running the Coleman 196cc engine in its stock configuration, even with the plastic cam gear, may be sufficient, especially for casual riding. Upgrades become relevant when targeting enhanced performance or addressing specific concerns like perceived component durability or vibration issues.
