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Twins Talk Discussion of Hinckley Triumph Twin related matters and topics. Sponsored By: Throttle Mojo

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Old 11-01-2012, 02:52 PM   #1 (permalink)
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Thruxton Hiccup

Respectfully requesting some help guys, I dont know where to start on this one.


2007 Thruxton, AI Removed, Air box removed, predators fitted and rejet.

Bike idles great and runs strong, however after she's warmed up idle increases from 1050ish to closer to 2K also possibly unrelated but thinking that its not I can feel it almost cough or hiccup and nearly stall and sometimes stall, I feel it cough through the POD filters near my legs, both at the same time.

My thoughts are ignition but Im wondering if I need to go down a size on the idle jets?!?

Thanks guys
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Old 11-01-2012, 03:35 PM   #2 (permalink)
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I would first check/replace the vacuum caps on the manifolds: this sounds like it could be a vacuum leak. There are some heavy-duty caps made I think for Kawasakis that fit very well and seal up solid (especially with zipties around them for insurance). I got mine from my local Triumph dealer.

Also check the rubbers that connect the carbs to the manifolds. Yours are getting pretty old now and could be leaking a bit, particularly once warmed up. Until you're certain there are no vacuum leaks, there is no use in rejetting, you'll just be chasing your tail.
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Old 11-01-2012, 04:22 PM   #3 (permalink)
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Quote:
Originally Posted by Ten Thrty2 View Post
Respectfully requesting some help guys, I dont know where to start on this one.


2007 Thruxton, AI Removed, Air box removed, predators fitted and rejet.

Bike idles great and runs strong, however after she's warmed up idle increases from 1050ish to closer to 2K also possibly unrelated but thinking that its not I can feel it almost cough or hiccup and nearly stall and sometimes stall, I feel it cough through the POD filters near my legs, both at the same time.

My thoughts are ignition but Im wondering if I need to go down a size on the idle jets?!?

Thanks guys

I was experiencing the same issue. While idling after warming up, my bike would cough/hic-up while sitting at a stop. It would come close to stalling, but only stalled once. Started back up without an issue.

Only now, once I start the bike, let it warm up so the engine is hot to the touch (usually a couple minutes), I shut the choke, give it some RPMs, but if I hold the RPMs between 2000-3000 RPMs, the engine starts to misfire. Like a clicking noise. After replacing the intake boots, clamps, vacuum caps and “O” rings on the intake manifolds mounted to the cylinder head, I’m fairly certain that I’ve been able to eliminate the possibility of a vacuum leak. This then directed me to start troubleshooting it as potential ignition problem. After testing with a spare coil and igniter and still experiencing the same issues, I've now placed an order with my dealer for a new pick-up coil. Once that comes in next week, I’ll get it installed and see where that leave me.

Everything circled in red is what has been replaced to date:



Like you, I’ve got AI Removed, Air box removed, predators fitted and rejetted. Not sure how you’re jetted, but I’m at 150 mains, 42 pilots, no shim under needle with air mixture screws at 2.5 turns out.

My issue started after I had my bike in for it's 12,000 mile service. I know at the time our bikes were manufactured the recommended gap on the pick-up coil was 1.0 mm +/-0.20 mm but was changed to 0.8 mm at some point during production due to warranty issues. So in my case, I'm wondering if the service technician simply reset my gap to the old factory specs. I'm going to crack the side case and check the gap but figured I should go ahead and order one now incase I need to replace it. If I don't, then I’ll have an extra for when/if I do need it.

This is the technical note sent out from Triumph: "Affected Models: Bonneville/T100, America, Speedmaster, Thruxton and Scrambler.

Should a bike (see above) demonstrate faulty ignition coil type symptoms (most commonly an engine misfire), please initially check and adjust the ignition pick-up (IPU) air gap (we recommend an air gap of 0.8mm).

Since changing the IPU air gap in production to 0.8mm, we have had no ignition coil warranty claims."


Here’s the video I shot of the issue I’m now experiencing. Because of this, I haven’t even been able to ride the bike to determine if it’s still coughing or hic-up’ing. But I’m assuming it’s all related and due to my pick-up coil on one way or another.

http://s73.beta.photobucket.com/user...DCD7D.mp4.html
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Last edited by bluesforchallah; 11-01-2012 at 04:36 PM.
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Old 11-01-2012, 04:46 PM   #4 (permalink)
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Cant watch the video, but yes sounds very similar, I tested the vac leak possibilities with carb cleaner and saw no spike in RPM's when sprayed, not ruling it out completley yet, Will you keep me updated on the pick up coil trouble shooting, my first thought was ignition as well. I havent done my 12K service yet, im at 11453 Miles.

Thanks guys so far I have some starting points, Im almost jetted the same im at 145 mains
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Old 11-02-2012, 11:51 AM   #5 (permalink)
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At this point im pretty confident its a pick up coil issue. Found the coil online but I am having some trouble finding a Gasket for the cover.
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Old 11-02-2012, 11:56 AM   #6 (permalink)
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Have you looked at bikebandit.com?

http://www.bikebandit.com/2007-trium...7307#sch569053
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2014 Scrambler. No mods... yet.
08 T100 with AI removed, K&N Pods, BC Predators, 145 mains/42 pilots, no shim, 2 turn out @ sea level SOLD
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Old 11-02-2012, 03:26 PM   #7 (permalink)
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I have a feeling the rubbers on my '01 are giving my similar troubles. Hard to start, pops on overrun, and throttle lags when engine is cold (and hiccups sometimes).

Using the carb cleaner method, is it safe to spray anywhere I would suspect a leak?
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Old 11-02-2012, 04:01 PM   #8 (permalink)
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I have a feeling the rubbers on my '01 are giving my similar troubles. Hard to start, pops on overrun, and throttle lags when engine is cold (and hiccups sometimes).

Using the carb cleaner method, is it safe to spray anywhere I would suspect a leak?
Be careful of painted surfaces....that stuff is deadly on clear coat.
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Old 11-02-2012, 04:07 PM   #9 (permalink)
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It just dawned on me... My issue also started happening to me when I was screwing around with the jetting and shims (adding and removing), which lead me to believe it was an issue related to air/fuel originally. It was only after I've pulled the carbs apart a number of times that I started leaning towards ignition. What it is that just dawn on me was I never actually pulled the plastic spacer between the needle and needle spring under the diaphragm after I was thru screwing with the needles. I've heard that it's possible for one of the 4 legs of that spacer to block the bleed orifice at the bottom of the piston causing what would also seem like symptoms of a misfire. I've already ordered my pick up coil and replacement gasket, but I think I'll have a look into the tops of my carbs when I get home tonight only to rule this out as a possibility.
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2014 Scrambler. No mods... yet.
08 T100 with AI removed, K&N Pods, BC Predators, 145 mains/42 pilots, no shim, 2 turn out @ sea level SOLD
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Old 11-02-2012, 04:33 PM   #10 (permalink)
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Quote:
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Be careful of painted surfaces....that stuff is deadly on clear coat.
Yeah it is. I've been meaning to pick one of these up for working in the garage. That way I can have the tank safely tucked away and still have a means to get fuel to the bike when I need it. Much easier than pulling>installing>pulling>installing the tank.

http://www.british-customs.com/motio...fuel-tank.html
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2014 Scrambler. No mods... yet.
08 T100 with AI removed, K&N Pods, BC Predators, 145 mains/42 pilots, no shim, 2 turn out @ sea level SOLD
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