Observed Valve Clearance

[Cormanus]

Max has kindly created a spreadsheet recording observed valve clearances to summarise data collected in [url=http://cb1100forum.com/forum/showthread.php?tid=8882]this thread.

It can be found [url=https://docs.google.com/spreadsheets/d/1oqQaAxkDBnJMwaupL8ctle85ThCTLYdyiFWDyKVbJ3I]here.

[max]

Max has kindly created a spreadsheet recording observed valve clearances to summarise data collected in this thread.

It can be found [url=https://docs.google.com/spreadsheets/d/1oqQaAxkDBnJMwaupL8ctle85ThCTLYdyiFWDyKVbJ3I]here.

Cormanus google now needs a "share link"for access, here it is, could you replace the old one with this one?
[url=https://docs.google.com/spreadsheets/d/1oqQaAxkDBnJMwaupL8ctle85ThCTLYdyiFWDyKVbJ3I/edit?usp=sharing]https://docs.google.com/spreadsheets/d/1oqQaAxkDBnJMwaupL8ctle85ThCTLYdyiFWDyKVbJ3I/edit?usp=sharing

God knows.......

[bvictory_imp]

Max has kindly created a spreadsheet recording observed valve clearances to summarise data collected in [url=http://cb1100forum.com/forum/showthread.php?tid=8882]this thread.

It can be found [url=https://docs.google.com/spreadsheets/d/1oqQaAxkDBnJMwaupL8ctle85ThCTLYdyiFWDyKVbJ3I]here.

It looks like the older models have valves going out of spec at higher mileage. I think I will wait until 30k miles to check mine on my 2014 model. Performance has been great and the valve train sounds great. When they start going quiet then you know that the are getting tight. That’s when you need to re-shim them so you don’t burn a valve.

[PowerDubs_imp]

These bikes chatter quite a bit from the injectors anyway..

[shahyaan_imp]

Just done mine on a 2017 RS at 17000 miles thankfully all still in spec


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[GoldOxide_imp]

Just done mine on a 2017 RS at 17000 miles thankfully all still in spec


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Excellent. Seems to be consistent with most of the Honda masses.

[barry hess_imp]

Does anyone here have a source for valve shims other than a dealer? Also, are the shims on the newer 1100s compatible with the 1983 model? I just found out my spare engine has a set of Andrews racing cams in it. They call for .004 inch on both sides and I will need to reset all of them when I reassemble it.

[Tev62]

The shim sizes are unlikely to be compatible. There are multiple shim sizes but the most popular today is the 7.5mm (7.48mm). 25mm were very popular on bikes in the 80's and 90's.

As an example, my 1995 Triumph are 25mm shim over bucket and the 2017 CB1100EX is a smaller shim under bucket. Smaller shims are used on more modern engines to reduce the mass which has to move very fast.

There are no end of online sellers. You just need to get the right diameter for your bike and then the right thickness depending on your requirements. You might find a shim kit better value for money if you have a lot to do but possibly not, it just depends on what you need and how much time you have to spare.

[Lord Popgun]

Here is a thread on the shim size. http://cb1100forum.com/forum/showthread....#pid304777

[barry hess_imp]

The shim sizes are unlikely to be compatible. There are multiple shim sizes but the most popular today is the 7.5mm (7.48mm). 25mm were very popular on bikes in the 80's and 90's.

As an example, my 1995 Triumph are 25mm shim over bucket and the 2017 CB1100EX is a smaller shim under bucket. Smaller shims are used on more modern engines to reduce the mass which has to move very fast.

There are no end of online sellers. You just need to get the right diameter for your bike and then the right thickness depending on your requirements. You might find a shim kit better value for money if you have a lot to do but possibly not, it just depends on what you need and how much time you have to spare.

Thanks for your input. I have 25mm shims on top. I will check with my local shop, but I don't think they will be of much help. Thay won't do a state inspection on a bike from the eighties.