Honda-SOHC

Could I suggest something I do,

Take the bike for a run   about 15 to 20 miles  get it nice and warm
When home, keep the engine running, put on centre stand

Get your long screw driver

Now ,turn one airscrew a quarter turn out,
Check what happens, blip the throttle, OK?

If it struggles,turn to previous settings

But if its OK,do another, repeat, and check

Remember, Modern fuel is different than 50years ago,

It might like a leaner tickover

Sent from my SM-A546E using Tapatalk

Good point John, most folk overtighten canister oil filter by hand often needing a chain grip tool to remove them.

I try to use the lower torque reading given or just by feel as the O ring becomes compressed.

My understanding of spark plug technology  is they are designed to be  self cleaning at higher revs/temperatures - obviously there is a limit to this function so if the mixture is overly rich right through the range they will soot up.

I suspect throttle blipping was something we used to do to keep the plugs from sooting up at idle to make a clean getaway.

My experience primarily with cars using carbs is that a vehicle used for mostly short journey work fitted with the manufacturers standard plugs would foul up badly needing a good run to clear the carbon deposits.

I particularly remember a disabled customer who ran an Automatic Opel Commodore 2.5 GS (1974) from his home to work a  distance of less than a mile. On collecting his Opel from Ashbourne it would not exceeed 45-50 mph flat out. During the course of the journey to our service department  in Burton the top speed would slowly improve until it would reach 60-65 mph. After a service the car would drive like it should for a 2.5 litre straight six.

Fitting a different plug type to cope with the short journey used mostly on auto choke was not an option as the customer would drive to Scotland a few times a year where he had family. In reality he wouid have been better driving a car with a much smaller engine.

I fitted this one 15420-300-020P a Honda part iirc 17 mm head listed for the CBX1000 that fits the 500/550 etc

I think it differs from the original as it has a bigger bolt head - not sure if its Chromed or something like BZP.
Some of the cheaper aftermarket ones do not have as many holes in the center section.

https://www.ebay.co.uk/itm/264943691840?itmmeta=01HWDDES73CKH5R32S12N9A5G9&hash=item3dafdfe840:g:u6QAAOSw8NtftZ1Z&itmprp=enc%3AAQAJAAAA8AzdMM%2BMWvZhhc3hpVrufY7HefzhlpBjKh9LzaHr%2BTT80HHYlIkG7YpopkBeJ%2FZ3XZh9zXeBaFEunnCDsd59kDVcH5j8xDbcFsICz9d5BtbEkzKUc2pnCo2OAF31Uob6BMrjg%2FrdKilBzxfgSWoyHWTZlQgnb0uBUEumpEYCd4%2FUT2PcHd4F%2FsGJlq6YMUyP9j3BJOUwkNMNTzoicdxObtnFl8FEShqtm0GMg1uF7hszwt80PGodPrm7IqxcdLonbebs--hlBAFjJNdpl8%2Fmn%2BQ1SU60yojghbXjfGLWmDOVzJ%2F1B52BKx6eaDVoCu32NA%3D%3D%7Ctkp%3ABFBM0pO7reNj

.https://www.ebay.co.uk/itm/264943686943?itmmeta=01HWDDES73YBCGWN4KZ8V7S89P&hash=item3dafdfd51f:g:u6QAAOSw8NtftZ1Z&itmprp=enc%3AAQAJAAAA8JrIwGRHmeU0aMJnday6MO%2B1H1pfpTS9yb76oegYbFuMXrq1Fl1eV3Tws9HdYd0FJbf7oUns3U14PrOi9z8Z3jatktB%2FXDiCvT%2FGOQFh2tzFT0YzXPxeBXbB20dSWVnUR%2FKnBFuZmiEtRZDfz%2FhR1QrFK6xQEg%2BM%2B1ueBOuFFm13NQ7hJ7JGLbhUuqQ2YU56hDA%2B%2Fxbqg4fIaeMTStWhhAmofAcfB86Lql5Kfyd0QAswCjkxo%2FBYXbBGAZWytMZAyU3khw5oOJAkxKLHXa4pZzVpInUxBW4Qvqikwqlf4TZEQlLpcsqu82Fgtl2rL1GVMg%3D%3D%7Ctkp%3ABk9SR9KTu63jYw

I've noticed quite a few Websites where phone numbers, actual postal address are missing as well as a lack of e-mail address.
Some that have them keep them well hidden it seems with lots of navigation needed.