Is it overheating?

[drainyoo]

quote:
Ok, as far as the shifting into neutral goes, that is the usual thing with Hondas of this vintage. It is generally caused by the clutch heating up and dragging a little bit. You may be able to cure it for a little while by replacing the clutch plates, both fiber and steel, and very meticulouslly adjusting the clutch within an inch of its life. This might cure it for 20 minutes or so. The easiest cure is to learn to click the tranny into neutral as you roll into a stop while the bike is still moving. It becomes second nature after a while. As far as the trans dropping out of second can be caused by a slightly bent shift fork or a less than positive shift into second and a weak shift drum detent arm spring. Try being very authoritative in you first to second shifts and see if that helps. If it does then the shift drum stopper arm detent spring is suspect.
As far as your backfire issues go, put a new set of plugs in it and ride it around until it shows the symptoms and then pull the plugs and tell us what they look like( see my previous post).

Ken

PS what oil are you running?

AHRMA 412
Vintage racing - old guys on old bikes

Not sure what oil was put it when I had it tuned up.

I'm going to try the other stuff and see what happens. Thanks.

[Geeto67]

quote:

quote:
Ok, as far as the shifting into neutral goes, that is the usual thing with Hondas of this vintage. It is generally caused by the clutch heating up and dragging a little bit. You may be able to cure it for a little while by replacing the clutch plates, both fiber and steel, and very meticulouslly adjusting the clutch within an inch of its life. This might cure it for 20 minutes or so. The easiest cure is to learn to click the tranny into neutral as you roll into a stop while the bike is still moving. It becomes second nature after a while. As far as the trans dropping out of second can be caused by a slightly bent shift fork or a less than positive shift into second and a weak shift drum detent arm spring. Try being very authoritative in you first to second shifts and see if that helps. If it does then the shift drum stopper arm detent spring is suspect.
As far as your backfire issues go, put a new set of plugs in it and ride it around until it shows the symptoms and then pull the plugs and tell us what they look like( see my previous post).

Ken

PS what oil are you running?

AHRMA 412
Vintage racing - old guys on old bikes

Not sure what oil was put it when I had it tuned up.

I'm going to try the other stuff and see what happens. Thanks.

about the shifting, popping out of second usually means that the bike was abused (powershifted, etc). However I have noticed a trend amoung younger honda riders (myself being one) of putting pressure on the lever when they are not shifting, either by resting the top of thier foot against the lever (like they are prepairing for an upshift) or resting the sole of their foot on the top between shifts. Any pressure on the shift lever will cause the bike to jump out of gear when you back off the throttle - I found I am guilty of this between 4th and 5th gear since 4th is such a long gear (as compared to 1st and 2nd which are pretty short on a cb750 and require fast shifts) and I have caused my bike to jump out of 4th a bunch of times without thinking about it.

I will probably be around sunday if you want to ride over and have me take a look.

[drainyoo]

quote:

quote:

quote:
Ok, as far as the shifting into neutral goes, that is the usual thing with Hondas of this vintage. It is generally caused by the clutch heating up and dragging a little bit. You may be able to cure it for a little while by replacing the clutch plates, both fiber and steel, and very meticulouslly adjusting the clutch within an inch of its life. This might cure it for 20 minutes or so. The easiest cure is to learn to click the tranny into neutral as you roll into a stop while the bike is still moving. It becomes second nature after a while. As far as the trans dropping out of second can be caused by a slightly bent shift fork or a less than positive shift into second and a weak shift drum detent arm spring. Try being very authoritative in you first to second shifts and see if that helps. If it does then the shift drum stopper arm detent spring is suspect.
As far as your backfire issues go, put a new set of plugs in it and ride it around until it shows the symptoms and then pull the plugs and tell us what they look like( see my previous post).

Ken

PS what oil are you running?

AHRMA 412
Vintage racing - old guys on old bikes

Not sure what oil was put it when I had it tuned up.

I'm going to try the other stuff and see what happens. Thanks.

about the shifting, popping out of second usually means that the bike was abused (powershifted, etc). However I have noticed a trend amoung younger honda riders (myself being one) of putting pressure on the lever when they are not shifting, either by resting the top of thier foot against the lever (like they are prepairing for an upshift) or resting the sole of their foot on the top between shifts. Any pressure on the shift lever will cause the bike to jump out of gear when you back off the throttle - I found I am guilty of this between 4th and 5th gear since 4th is such a long gear (as compared to 1st and 2nd which are pretty short on a cb750 and require fast shifts) and I have caused my bike to jump out of 4th a bunch of times without thinking about it.

I will probably be around sunday if you want to ride over and have me take a look.

Gee,

I didn't check the forum until today, sorry, but if you are still up for it I can swing by this Sunday if the weather holds up. Let me know.