Topic: 2nd gear feels like it's not getting gas at high rpms

[bookah]

Title. All other gears feel fine, when in 2nd and in the upper band the engine feels like it just isn't getting gas. Anyone know what this is all about?

[70CB750]

Could it be the gear dogs?

[flybox1]

positive it isn't a jetting issue?

[Don R]

 Just guessing but could the floats be set low and in second when it's pulling hard the fuel is running up the back of the bowl?

[70CB750]

Usually the 3rd gear seas the hardest acceleration, if it starves for fuel, that's where I would expect issues.

[bookah]

Just guessing but could the floats be set low and in second when it's pulling hard the fuel is running up the back of the bowl?

I think you might be right. This morning I had a really hard time kicking her over. Sparks firing, gas flowing to bowls, compression is fine. My guess is the floats are set wrong and it's having a hard time sucking anything up. Once I kicked it over I had no problem kicking it over again, but getting that initial grab was like pulling teeth.

[flybox1]

clear tube test, asap.

[bookah]

clear tube test, asap.

What's this?

[bookah]

positive it isn't a jetting issue?

Well the jets were working perfectly. I recently replaced the carb bowls but I didn't touch the floats or jets. Now this.

[flybox1]

positive it isn't a jetting issue?

Well the jets were working perfectly. I recently replaced the carb bowls but I didn't touch the floats or jets. Now this.

by "jetting issue' i mean your air/fuel mixture could be off, lean or rich, and giving you no throttle response.
doesnt mean your jets are bad, just incorrect for that throttle position.  Fuel starvation maybe?
the clear tube test is used to see what the fuel level is inside your carb bowls.
too high and you'll run rich, to low and you'll be lean.

http://forums.sohc4.net/index.php?topic=149299.0

[Deltarider]

My guess is the floats are set wrong

Why would a PO or anyone else set the floats wrong?

[flybox1]

My guess is the floats are set wrong

Why would a PO or anyone else set the floats wrong?

Because if it isn't broken, they HAVE to fix it 

[bookah]

positive it isn't a jetting issue?

Well the jets were working perfectly. I recently replaced the carb bowls but I didn't touch the floats or jets. Now this.

by "jetting issue' i mean your air/fuel mixture could be off, lean or rich, and giving you no throttle response.
doesnt mean your jets are bad, just incorrect for that throttle position.
the clear tube test is used to see what the fuel level is inside your carb bowls.
too high and you'll run rich, to low and you'll be lean.

http://forums.sohc4.net/index.php?topic=149299.0

Perfect thanks. Can I run the tube off the overflow drain, or does it have to be in the drain screw hole?

[flybox1]

read the thread i linked.
your carb type determines where your tube connects.

[bookah]

read the thread i linked.
your carb type determines where your tube connects.

Ah, yea PD carbs. Thanks!

[flybox1]

Ah, yea PD carbs. Thanks!

The best kind.  @overflow tubes - makes this test a cinch!

[Don R]

My PO bent up the float tabs and drilled the jets. Who can say why I bet it's the same reason one put a huge 55/65 watt halogen headlight bulb in a 6 volt CL100

[Don R]

 Could it be you're just snapping the throttle open too fast and hitting the flat spot caused by a lack of accelerator pumps? 

[Redline it]

I would just remove second gear from the trans.

[goldarrow]

Let me take it out for a test ride for ya

[harisuluv]

I can't really think of a reason why the fuel system would be responsible for something only happens in 2nd gear.  Not saying it's not possible--just trying to think of logically why that would be the case.

[70CB750]

I can't really think of a reason why the fuel system would be responsible for something only happens in 2nd gear.  Not saying it's not possible--just trying to think of logically why that would be the case.

My money is on the transmission, 2nd gear is notorious for wearing out first.

[harisuluv]

Aw, that would be a bummer.  I'd rather wrestle the carbs on and off 2-3 times with hard boots than have to split the cases

[Kenzo]

Just guessing but could the floats be set low and in second when it's pulling hard the fuel is running up the back of the bowl?

I think you might be right. This morning I had a really hard time kicking her over. Sparks firing, gas flowing to bowls, compression is fine. My guess is the floats are set wrong and it's having a hard time sucking anything up. Once I kicked it over I had no problem kicking it over again, but getting that initial grab was like pulling teeth.

If the bowls were low I would expect a definite stumble not just feeling of being low on power.

~5,500 to ~8,500 is the sweet spot for producing power...how high are you revving it? The power does drop off when approaching redline. When I get on it hard second gear runs out real quick and reach for third.

It does not sound like a transmission problem.

Cheers,
Kenzo

[bookah]

I am just at a complete loss. I rode it home from work. Kicked over first kick,  shifts perfectly. No gear slippage,  getting gas all gears no matter how high I take the rpms. Im thinking the fuel issues solved itself (this was only the second rode since I finished the rebuild on thurs) ...then a whole new issue springs up.

I pull into my driveway after the 20ish mins home and the bike dumps about 1/4 qt of oil right when I pull in. Never had leak issues in the past. No oil where I park it at work or where I park it at home. Wtf. And I can't even tell where it came from since the whole bottom is oily. I haven't touched the engine,  no bolt tightening, nothing. It rode just fine when I finished the rebuild of the bike except for the above mentioned fuel issue (which,  to answer some further questions here, simply felt like the bike was running out of gas when I was in the upper rpms of 2nd).

It seems I can't escape issues. Everything that could go wrong,  will.