Hi, I installed TM36-68 and noticed - acceleration response is quick but deceleration is gradual, slower than on CV. I have both cables connected. Is it normal or I missed something?

 

Nope, that's not normal. One or both of your throttle cables may be too tight. Turn the handlebars all the way to the left or right, and if the idle speed picks up, there isn't enough slack. You can try disconnecting the push cable to see if the problem goes away. If it does, make sure it's not binding somewhere, and that the throttle wheel isn't rubbing anything. You may also have your idle speed set too high. Try adjusting it down a little bit and see if that fixes it.

 

Agree with Mustang. I notice no decel difference between the two carbs as far as speed decreasing at a different rate. Maybe an air leak at the carb/manifold interface...but I find the fit at this spot to be just about ideal with the 36 and OEM manifold. I'm thinking a lean jetting condition may exist at the pilot jet/air jet part of the tuning curve. This carb seems to like a richer rather than leaner setup...up to a point. Mustang's definitely right to check the throttle cables first. That, and make sure the linkage throttle wheel on the carb isn't rubbing on something. I think I'd ditch the return cable as long as you're sure you have good clearance around the throttle wheel on the carb.

What jetting are you running?

 

I have no experience w/ this particular carb but that symptom generally means too lean on the idle/slow circuit. Try turning the idle mixture screw out 1/2 turn.


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Gmmm... my settings are 51/P8 pilot 15 main 135 for 351 barrel. Lid half open (cut out). Standard settings that most people have. It is on reach side coz I am not at sea level - 300 meters. However rides are down to the coast. The difference is noticeable when bike is accelerated from idle without gear. It is 1.5k rpm on idle, very stable. Revs up immediately but slowly (about 3-5 secs) goes down to 1.5k when throttle is quickly closed. Just checked it - it does close and cables are OK. It is not noticeable when riding but only on the stand.

 

I forgot to mention that when I tuned up the idle fuel (and air screws) it was about 2.3 turns out, similar to what one expect for normal situation. Playing with idle screws does affect the idle noticeably. I agree that vac leak somewhere near manifold could give this kind of problem that I am experiencing now. Actually TM fits well into KLX design and I was very careful to fit it well into manifold. Ohh..

 

Everything you mention sounds about right. I've never had a hanging idle problem with the TM36, but I have had that problem with other carbs. Each time it was related to 1 of 3 issues: The idle was set too high, the choke didn't completely close, or the cable/throttle tube/throttle linkage was binding somewhere.

Even though your idle is set right, try backing it down and see if that helps. Make sure the choke is closing completely. I once had a tiny piece of crud inside the choke port on a TM33 that caused me all kinds of grief trying to diagnose what was going on.

Just to cover all the bases, make sure the throttle grip isn't rubbing anything (like wrap-around handguards). Does your throttle grip have any free play? I don't know what the spec is, but there should be a small amount of play at the grip before the throttle is opened.

I'm just trying to throw some ideas at you, because I've never had a hanging idle problem that only happened when the bike was sitting in neutral. Every time I've encountered that problem, it was there all the time.

 

Thanks guys for the tips, specially Mustang... I gonna try this weekend...

 

I used to have a DRZ-E with the pumper carb. It had a troubling hanging idle until I richened the jetting. Totally went away with nothing but a jetting change. No sticky idle/throttle/cable etc.

Food for thought.

 

With the exception of the hanging idle, how does the bike run? Does it pop and backfire on deceleration? Have you noticed a flat spot or lack of power right off idle to about 1/4 throttle? You haven't mentioned this, and I just assumed that it was running fine except for the hanging idle issue. If a lean pilot jet is the culprit, you'll notice these other problems too.