It run's like a champ. Idles smoothly & has great throttle response.
If it starts knocking & pinging, then you're in trouble
Jun 14, 2009 11:33:18 AM, [email protected] wrote:
Dennis,
On an 83 NH 650 is there anything that can be done to tension the
chain if the tensioner is not doing it's job. I hear a chain
"slapping" sound upon semi-rapid decelleration on mine.
I thought I read something about 83-85 year models may have a spring
that has lost tension (replace spring?) or the tensioner arm has stuck
for some reason (hmmm - why would this be ?) and that loosening the
mounting screw(s) and then retightening allows the tensioner to
retension the chain.
I have not seen the actual tensioning linkage yet (coming soon I
think) so I really have no clue if any of this really applies. It
seems it would not have been in the original design intent of Honda.
Also how long do we expect the cam chain to last before it has
stretched to the point that replacement is required? Is that a
horrendous task?
Thanks,
Paul
On Jun 12, 8:40 pm, Dennis Hammerl <[email protected]> wrote:
> The article refers to much earlier model 750's. Your's has no such adjustment. There are no external fasteners or adjusters on a later model.
>
> --- On Fri, 6/12/09, RicCarr <[email protected]> wrote:
>
> From: RicCarr <[email protected]>
> Subject: [Nighthawk Lovers] Cam chain Tensioner reset ?
> To: [email protected]
> Date: Friday, June 12, 2009, 12:32 PM
>
> Hello,
> Anyone tried this tip on the www.hondanighthawks.net/repair.htm page?
>
> I have the Clymer manual for my 1992 750, but still wasn't clear on where the "self adjusting cam cam tensioner" was. The author notes a "two minute" effort. I believe I do have a rattle sound as described, so thought giving this adjustment might be worthwhile. Opinion?
>
> Cheers,Eric
>
> Quote ...
> I found a substantial improvement in the sound of the top end of the motor after taking two minutes to loosen up (then retighten) the self adjusting cam chain tensioner and let it do its thing. Before this adjustment I was getting a rattling/loose sound from the top end at about ~4300 rpm. The sound is now totally gone. I have also pulled the carbs and found the acceleration pump was mal-adjusted and was not doing its job at all. After the fix (parts available on eBay for less than $20), I now see four nice little spurts of fuel down through each of the four carbs whenever the throttle is whipped open (the design here is to keep the fuel/air mixture from becoming momentarily too lean when the throttle plate is suddenly opened). With this repair, I hope to see an even better throttle response now when I get it back together.
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