Zongshen

[Britster]

The XR200 has an MSRP in the Philippines of 137,900.00 Peso ($3,225.00 USD)
http://www.hondaph.com/showcase/xr-200

The Honda website has the XR200 engine as a 4 - Stroke OHV Air Cooled, however the image is of a OHC engine?

MJH,

Can I ask you please, why you seem so sure that the engine featured on the Honda Philippines website is OHC rather than OHV?

If you could see the other side of the engine, the presence of a 'Cam Chain' and a 'Cam Chain Adjuster', would confirm it is 'OHC' not 'OHV'.

Certainly the presence of Tappet Covers is no proof as these are present on OHV engines using 'Push Rods' to operate the Tappets. On OHC engines where the Cam actuates the Tappet movement, there will be Tappet Covers to allow Tappet Adjustment


So what is this Honda XR200 engine - 'OHV' or 'OHC'?

Honda.ph XR200 engine.jpg

Well it is a Photo from an owner of a Honda XR200, bought in the Philippines!

To me, they look the same (from the right hand side view at least)?

This suggests that Honda are showing a photo of the XR200 engine, which is the same as the XR200 engine being SOLD, in the Philippines, which they say is 'OHV', not 'OHC'.

Are the Specifications correct for an OHV XR200?



They both have Over Head Valves (OHV) actually! It is how these 'Overhead Valves' are actuated, that is the difference!

There are 4 x Different Engine Designs:-

1. OHV engine design (Push-Rods actuate Rocker Arms and Tappets the Valves)
2. OHC or SOHC engine (Over Head Cam actuates the Rocker Arms and Tappets the Valves)
3. OHC or SOHC engine (Over Head Cam actuates Valve directly)
4. DOHC or Twin Cam engine (OHC actuates Inlet Valves, another OHC actuates Outlet Valves)

(1) and (2) both use pivoting Rocker Arms to actuate the Valve via Tappet Adjustment Screw (Easy Maintenance, but lower max RPM).
Better optimized port configurations made possible with overhead camshaft designs. With no intrusive push-rods the overhead camshaft cylinder head design can use straighter ports of more advantageous cross section and length. The Power Gain may be worth the added complexity of driving the OHC.

(3) and (4) have the advantage of Higher RPM and better porting to produce more Power than OHV engines, especially DOHC, since wider angle between Inlet and Exhaust can be accommodated. Multiple Valves designs are also possible


See http://www.samarins.com/glossary/dohc.html for animated illustration of (1), (3) and (4)