Cam Chain Spring Tensioner

[Derk]

Hi, I have a K4, how can I make sure my spring tensioner does the job. I adjust the bolts during the cam chain adjustment procedure. But no difference . I also inserted a small Alen key in the hole in order to check any return tension, but nothing. Will I have to remove and clean the whole cam chain ?

 

[UK K6]

I removed my tensioner and found it was very reluctant to move on the spring. I gave the shaft a very light rub with 800 grit, then polished it with metal polish and it was much happier. Of course, the gasket was toast, so I made one up from a sheet of gasket paper.

Assuming it's a 750? There's a specific point to adjust the tensioner. I only mention this in case you weren't aware. The Honda workshop manual covers it in 2 places, but only one of them mentions the tensioner should be released at 15 degrees past (I think it's past, rather than before) TDC for 1 & 4, with cyl 1 on its compression stroke (if I recall correctly, but plse check). This is the point the chain is at its loosest.

 

[Derk]

Hi UK K6, thanks for yr reply, regarding the 15 degrees past , only one tuto, out of 4, Was advising it. Indeed I have a 750. May be I should try the adjustment again with a 15 degree past. As the one I just did , did not change a lot.
D.

 

[UK K6]

It's possible the slider is snagged and needs TLC.

What are you concerned about / why do you think your cam chain is slack? If you're trying to get a quiet and smooth idle at about 1,000 rpm, you'll likely never get there. I'm not convinced they ever did. Even with identical compression on all 4, carbs 100% in synch, timing spindle 100% true, points and timing spot on, strong auto advance spring, valves at spec, primary and cam chains at correct tension... I went down that rabbit hole and settled for a smooth idle at 1300 revs instead

Oh, the clutch can rattle a bit too!

 

[Derk]

Merci Monsieur,
I always chose my bikes for the sweet melody of their Engine. 1942 WLA, 1985 XT 500 Yamaha and my Honda. And like you said having

It's possible the slider is snagged and needs TLC.

What are you concerned about / why do you think your cam chain is slack? If you're trying to get a quiet and smooth idle at about 1,000 rpm, you'll likely never get there. I'm not convinced they ever did. Even with identical compression on all 4, carbs 100% in synch, timing spindle 100% true, points and timing spot on, strong auto advance spring, valves at spec, primary and cam chains at correct tension... I went down that rabbit hole and settled for a smooth idle at 1300 revs instead

Oh, the clutch can rattle a bit too!

Thanks for yr comments. Indeed I should stop being sound paranoiak and enjoy the ride. have a good Su day

 

[UK K6]

pas problem!