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From: VFR1200F Valve Inspection



Plastics Removed

I began with a strip down of the basic plastic removal around 3am in the morning, I work nights anyway and well it is a quiet time for me with no interruptions from nosy family members! That took no time at all I am getting pretty good at removing the plastic.

Top cover and air filter removed

Fuel tank Quick Disconnect

vfr1200f ECM

Top cover and K and N filter

You can see the ecm connectors here

removed the rest of the air box

Removed the throttle body

Fuel rails and fuel injectors

Covered the intakes with tape to avoid anything getting into the engine

Removed the front cylinder head plastic heat shield

Yes you have to remove all that just to get to the front spark plugs, lucky they use high mileage iridium spark plugs with a 30k lifetime so you are going to have to inspect the valves before hand before you have to replace them - I did that and they all looked fine. I had all of my exhaust valves just out of spec those are the rocker roller set, and one of the bucket under shim intakes was loose but still in spec. Just as I figured the roller rocker design would be more apt to be out of spec then the bucket under shims would be, just like the CRX dirt bikes! Its a simple elegant design, less rolling mass with only one cam shaft and the cam chain does not need a huge bend in it for a powerful cam chain tensioner this design uses a spring loaded bow tensioner instead of a massive punch design like the vtecs use.

Gapping the iridium spark plugs

The front cylinder has very cramped working space

More fun days on the bike

There are two marks on the timing cover I suppose its easier then the 4 I had on the old girl, you watch the cam shaft on the rear set for direction ques as you turn it to make sure the engine is in top dead center for the cylinder your inspecting all marked out in the manual but the manual has very small pictures for the cam shaft positions so its hard to read. I managed it though. They have 3 measurements for the Valve Clearance

Exhaust Valves have a roller rocker design with a roller on one end and a screw driver and lock nut on the other with a square head for the driver. They were all out of spec all of them!

The manual has two sets of measurements for the exhaust side

Valve side with the lock nut 0.03 + or - 0,02 mm or (0.012 + or - 0.001 inches)
Roller side 0.21 + or - 0.02 mm or (0.008 + or - 0.001 inches) my gap strips were in listed in both but came stepped up in inch sizes so I use the inch listings

Intake side is the shim under bucket design

0.16 + or - 0.003 or (0.006 + or - 0.001 inches) on one was loose at .007 but still in tolerance and most likely to go tight as it wears.

Manual has a warning picture on how to gap the plugs

The cylinder fireing order adjustment sequence

Manual procedure to measure the exaust valves

The manuals procedure for a adjusting the vavles

Source: VFR1200F Valve Inspection


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