Topic: honda nighthawk 84 650 help running hot

[dennismsaunders]

i just cleaned carbs all new seals,but i have a i think problem with the 2 cylinders #3&4 running 40/50 degrees hotter then# 1/2 side of bike?
any one got any tricks to tune i do not have a manometer,maby i can rent one?
thanks and this looks to be a great forum.
thanks dennis

[Soos]

Are you sure you posted this in the right area?

If you are in the US, the '84 is likely to not be a SOHC.





l8r

[cb650]

The inner 2 will runn hotter than the outers wont they guys?

[Soos]

Yup.


Even the Clymer manual I have states that.



You can do a shadetree mechanic trick and run slightly different heat range plugs on the 2 inner cylinders though.
Not sure if it's really worth it though.



l8r

[dennismsaunders]

please excuse me im stupid,your right there are 2 cams,thanks
so as i understand  a 50 degree differance is normal? cool i thought i had the carbs screwed up
can any one tell me a normal temearture??after about 5 or so minutes stand still
with some high reving im getting about 240 ,im using a inferred gun

but again it seems to be hotter on the right side then the left?

thanks alot guys

if you cant tell im pretty new to cycles

i cannot belief the amount of onfo and personal help on this site
thanks again

[cb650]

Yes you are in the "other bikes" section so pefectly fine.  Soos was most likely cranky cause I sent him the wrong wheel .   I might be able to borrow a gun and check mine this weekend. 

[martino1972]

checking your sparkplugs will tell ya if the jetting is right.....

you will have to do a "pug chop" for that.......ride the bike,give her WOT for a bit(doesn't have to be 5th gear,as long as theirs a good load on the motor) then pull in the clutch and kill the engine right away....freewheel back to your shop/garage,let cool down for a bit and then pull your spark plugs out......by looking at thew color of the tips you can see how she is jetted.....

[Soos]

Yes you are in the "other bikes" section so pefectly fine.  Soos was most likely cranky cause I sent him the wrong wheel .   I might be able to borrow a gun and check mine this weekend. 

no it took glen a day or so to move the thread to the proper place....
And yes I was having a bad day, nothing to do with you 650.(BTW,  PM on the way 650)
Sorry for snipping at you there..



Oh, and as far as a 50 degree difference, my cb650 has the inner two running about 40-45 degrees hotter than the outer two. depending on the RPM I hold the motor at.

So (IMO) nothing too major there.

My cb650 is a '79 with lots of mods, ignition, pistons, carbs, oil cooler, and on, and on...


Although a plug chop can't hurt by any means though.
Lots of threads on the subject.


l8r

[Hush]

Honda built a DOHC 650? don't think they got to New Zealand!

[cb650]

Yes in the states it was made from 83 to 87 or 88.  Have seen a 87 but not shure when the stopped.  Shaft drive 6 speed.  A couple of the new members on the 650 site posted pics of them.