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Author Topic: KLR You Experienced? Err, kinda not really.  (Read 14627 times)

Online The Jimbonaut

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Re: KLR You Experienced? Err, kinda not really.
« Reply #350 on: May 13, 2018, 18:13:56 »
I dunno man, after making sure that the choke was working properly (99% confident it is now) the plug still gets really sooty after a couple of minutes of idle only (no throttle at all). It also started up with no choke.

So the carb is dumping way the fuck too much gas into the cylinder before I even get moving. Thatís not the main jet I now know, but the pilot circuit. Iím going to pull the carb out, switch everything back to stock and see what gives.

Stock needle too? Right now I have the DynoJet needle set at stage 2. Guess Iíll switch that out as well. That way Iíll be back to baseline and can take it from there.


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Offline farmer92

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KLR You Experienced? Err, kinda not really.
« Reply #351 on: May 13, 2018, 18:17:30 »
I dunno man, after making sure that the choke was working properly (99% confident it is now) the plug still gets really sooty after a couple of minutes of idle only (no throttle at all). It also started up with no choke.

So the carb is dumping way the fuck too much gas into the cylinder before I even get moving. Thatís not the main jet I now know, but the pilot circuit. Iím going to pull the carb out, switch everything back to stock and see what gives.

Stock needle too? Right now I have the DynoJet needle set at stage 2. Guess Iíll switch that out as well. That way Iíll be back to baseline and can take it from there.


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Is the float valve working properly?
Maybe the valve isnít closing and the bowl gets overfilled?
Overflows cleared?

Offline Maritime

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Re: KLR You Experienced? Err, kinda not really.
« Reply #352 on: May 13, 2018, 18:17:45 »
Yes, put it alk to stock abd start from there.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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Online The Jimbonaut

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Re: KLR You Experienced? Err, kinda not really.
« Reply #353 on: May 14, 2018, 11:05:55 »
Well I'll be dipped in shit.

Said my goodbyes to the Ottawa inlaws in double-quick time, hurried the missus out the door and dropped the hammer all the way back to Montreal yesterday.  Got home, dumped the toothbrush and got straight to the garage to do what was suggested - tear the carb down and replace all the DynoJet stuff with stock. 

There was gas everywhere - in the intake and outlet rubber boots, the venturi itself was dripping, man it was seriously flooded.  Something was pouring gas into the carb no doubt, but that much was already obvious.  Checked all the specs though and I'd definitely followed the DynoJet instructions to the letter.  Still unsure as to what was causing the over-gas, but hey.  Couple of hours later I got the freshly rebuilt and cleaned carb back in the bike and took the old girl out for a spin and whaddya know.  Idles great, throttle response great, no plumes of black smoke when I blip the throttle.  Thrilled - if I had a tail I'd wag it.

So thank you for you help and perseverance guys, once again your long distance assistance has got me in the saddle rather than sitting on a shop stool staring at it.

What I noticed -

- Still need to get WOT as only took it around town, but I thought I felt a little more vibration through the footpegs
- exhaust sounded quieter (that's a good thing, just ask the neighbours)

Will get it out again today and will take it through the throttle positions and report back.  I still don't entirely understand how stock jetting/needle/idle screw etc can provide enough gas for the big bore, but as someone mentioned maybe that's balanced out by the less restrictive exhaust and modified air box?

But for now, thanks again.  You got this guy doing laps on Rhonda and now El Verdito is chomping at the bit.  Muchas gracias one and all.

Probably should get some glamour shots of the bike up soon too  8)
 
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline SONIC.

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Re: KLR You Experienced? Err, kinda not really.
« Reply #354 on: May 14, 2018, 11:21:30 »
Huzza!!

If there was that much gas in there I'd bet that your floats were not adjustred right or sticking open. Either way congrats on getting it up and running!

If you think about the basic function of the carb:
The piston goes down and causes an air void that atmospheric pressure feels the need to fill. The air flows through the carb at high speed and runs over the jets, this vacuum effect sucks fuel up the jets into the air stream (and then into the cylinder). Stock you're getting a certain amount of air flow through that carb orifice.
When you go up in bore that "void" gets bigger so you need more air to fill it. The only way to get more air through that same carb in the same timeframe is to pull it in faster, which increases the velocity over the jets and sucks more fuel in. So on the same carb settings with a bigger bore you get more fuel than you did with the stock bore.

It's not always linear because it all depends on the design of the carb, size of the jets, etc etc but in general that's how it works.

Now that it's running close to right you can do some plug chops to see if that fixed the issue or not, you could still be rich or lean with the stock jets and you'll likely need to fiddle a bit to get it right.




Offline datadavid

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Re: KLR You Experienced? Err, kinda not really.
« Reply #355 on: May 14, 2018, 11:22:48 »
Well I'll be dipped in shit.

Said my goodbyes to the Ottawa inlaws in double-quick time, hurried the missus out the door and dropped the hammer all the way back to Montreal yesterday.  Got home, dumped the toothbrush and got straight to the garage to do what was suggested - tear the carb down and replace all the DynoJet stuff with stock. 

There was gas everywhere - in the intake and outlet rubber boots, the venturi itself was dripping, man it was seriously flooded.  Something was pouring gas into the carb no doubt, but that much was already obvious.  Checked all the specs though and I'd definitely followed the DynoJet instructions to the letter.  Still unsure as to what was causing the over-gas, but hey.  Couple of hours later I got the freshly rebuilt and cleaned carb back in the bike and took the old girl out for a spin and whaddya know.  Idles great, throttle response great, no plumes of black smoke when I blip the throttle.  Thrilled - if I had a tail I'd wag it.

So thank you for you help and perseverance guys, once again your long distance assistance has got me in the saddle rather than sitting on a shop stool staring at it.

What I noticed -

- Still need to get WOT as only took it around town, but I thought I felt a little more vibration through the footpegs
- exhaust sounded quieter (that's a good thing, just ask the neighbours)

Will get it out again today and will take it through the throttle positions and report back.  I still don't entirely understand how stock jetting/needle/idle screw etc can provide enough gas for the big bore, but as someone mentioned maybe that's balanced out by the less restrictive exhaust and modified air box?

But for now, thanks again.  You got this guy doing laps on Rhonda and now El Verdito is chomping at the bit.  Muchas gracias one and all.

Probably should get some glamour shots of the bike up soon too  8)
You most probably have a worn/sticking float valve! At first they just stick and leak sometimes, eventually they leak all the time.

Offline irk miller

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Re: KLR You Experienced? Err, kinda not really.
« Reply #356 on: May 14, 2018, 11:26:26 »
The vibrations may, and are most likely, a thumper thing.  Could be the balance on your rims, too, but my F650 tends to be buzzy between 20mph and 45mph.  Once I get above 45, it smooths out.  Cruising the highway at 60 mph+ it's smooth as silk, even with Karoo3 dual sport tires.

Offline farmer92

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Re: KLR You Experienced? Err, kinda not really.
« Reply #357 on: May 14, 2018, 12:15:06 »
Right on Jimbo

Now you just need to find some fields to go tear up


Online The Jimbonaut

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Re: KLR You Experienced? Err, kinda not really.
« Reply #358 on: May 14, 2018, 12:36:50 »
Right on Jimbo

Now you just need to find some fields to go tear up



Ye gads, if that was my view I'd be a blur in it every chance I got!
"I'm telling you Donnie, nuthin' but nuthin' but right"

Online The Jimbonaut

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Re: KLR You Experienced? Err, kinda not really.
« Reply #359 on: May 15, 2018, 10:44:10 »
Another ride yesterday and the difference is night and day.  I'm not sure if it was the pilot/idle circuit that was drowning out the carb, or the float.  I checked the float needle and it didn't appear to be sticking at all, and I'd already adjusted and measured the float height and it was spot on.  I'd love to know or figure out what was causing it, but perhaps it'll be one of those things that'll become apparent with more carb tuning experience.  I really enjoy the diagnostic/remedial process (thankfully!), and have learnt a lot already from this KLR. 

Raining cats and dogs here today.  Need to address the leaky petcock - it's not the petcock itself but rather a stripped captive nut inside the tank that the petcock bolts into.  I need to tap the bolt and that should take care of it.  It's not leaking badly, but incontinent gas tanks aren't much of a cause for celebration.

Another thing - Irk you reminded me that I need to balance the tires.  I'd already ditched the huge lead weights clamped to the spokes like tiny sloths - I used CounterAct Balancing Beads (they're like Dyno Beads) in the Honda which worked well so I'm going to use them in the KLR as well.  They're arriving today, along with some S100 cleaning stuff so Rhonda can get a long overdue brush up.
« Last Edit: May 15, 2018, 10:46:25 by The Jimbonaut »
"I'm telling you Donnie, nuthin' but nuthin' but right"