07-06-2016, 11:50 PM | #16 | |
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Location: Oregon
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07-07-2016, 10:59 AM | #17 | |
Join Date: Jun 2015
Location: Weston, CO & Sangre de Cristos
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I did talk to Gerry a couple weeks ago about jetting. He recommended just changing the main jet and adjusting the clip on the needle. As I understand it the slow/pilot jet is only needed up to 1/4 throttle. Don't know about you but I spend nearly 0 time at 1/4 throttle . Rojo
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'15 RX3 (Rojo's) '15 RX3 (marzhere's) '16 TT250 |
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07-07-2016, 11:08 AM | #18 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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At 3000', I've not needed the choke yet. Starts right up. Just a tad lean for a minute but clears up quickly.
Rojo, did Gerry mention the bore size of the stock carb? I didn't see it in any specs. It looks small, according to the slide chimney and the casting on the head side...like a 32 or 34 maybe. Just guessing.
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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07-07-2016, 11:24 AM | #19 | |
Join Date: May 2016
Location: Hacienda Heights, Ca
Posts: 281
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I'm guessing the slow hot restarts are a rich condition, fuel in the carb evaporating and "flooding" the motor with vapors. Some bikes are more prone to this than others, but it seems fairly common on this style bike. I assume because the entire intake tract is level that it fills with vapors whereas sport bikes and many others have the carb and airbox above the motor so the vapors would settle right at the intake and clear out more quickly-just theory based on the fact that fuel vapor is heavier than air. The fact that a motor that should be jetted fairly lean will idle cold with no choke is a little odd, but not unheard of and especially with this style layout. If the exhaust outlet weren't so small I'd take it over to my smog test buddy and get some numbers. |
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07-07-2016, 12:55 PM | #20 | |
Join Date: Jun 2015
Location: Weston, CO & Sangre de Cristos
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I'm still getting a little hesitation at 3/4 to WOT at the moment with the 102 main. Seems better than the 108. But I'll still tweak some more. Got 650km/400 miles on the bike now and just installed a new iridium spark plug last night. Hope that will smooth it out some. Rojo
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'15 RX3 (Rojo's) '15 RX3 (marzhere's) '16 TT250 |
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07-07-2016, 01:05 PM | #21 | |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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Sounds like a stumble between circuits. What's your pilot screw set at? I had this problem with my Rhino and just a quarter turn more rich helped a lot. Also, are these the iridium plugs you run? I have these in Q and the Rhino (CG motor). Just want to make sure I'm running the right plug. https://www.amazon.com/dp/B006B253K8...I1XJPTCSABNEVG
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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07-07-2016, 01:54 PM | #22 | |
Join Date: Jun 2015
Location: Weston, CO & Sangre de Cristos
Posts: 240
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I'm running the DENSO 5376 {#IX24B} Iridium Power Sparkplug. Ordered from RockAuto. I believe these are the cross reference to the NGK plug. Haven't ridden with this plug in there yet so we'll see how it goes. Rojo
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07-07-2016, 04:56 PM | #23 | |
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Location: akwesasne, NY-13655
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07-10-2016, 03:25 PM | #24 |
Join Date: Jun 2015
Location: Weston, CO & Sangre de Cristos
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Idle/pilot Jet not adjustable, sort of...
I noticed this a couple weeks ago when swapping out the main jet. Not unusual to have the idle/pilot jet covered after being set at the factory for EPA purposes.
My KLR was like this. I drilled out the thin aluminum cover to get access to the idle jet. On the TT however, it looks as if the jet was set at the factory then the head was ground off not allowing for adjustments or even removal for cleaning as shown in the owners manual. So out comes the dremel to cut a slot to remove. BTW. The jet was set at 1.25 turns out from the bottom. Also measured the throat of the carb (on the engine side) while i have it out, measures 29mm ID . 38 mm ID on the air airbox side. Rojo
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07-10-2016, 03:42 PM | #25 | |
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Location: coastal SC.
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2016 TT250 2014 NSS300 FORZA 2014 UN200 BURGMAN |
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07-10-2016, 03:50 PM | #26 |
Join Date: May 2016
Posts: 583
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that's a cover, not the idle screw. The idle screw is recessed.
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07-10-2016, 05:38 PM | #27 | |
Join Date: Jun 2015
Location: Weston, CO & Sangre de Cristos
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Rojo
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07-10-2016, 06:21 PM | #28 |
Join Date: Dec 2015
Location: coastal SC.
Posts: 206
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I seen a video on you tube where a guy had to do the same thing he said that the manufacturer did it for whatever reason
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2016 TT250 2014 NSS300 FORZA 2014 UN200 BURGMAN |
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07-10-2016, 09:41 PM | #29 |
Join Date: May 2016
Posts: 583
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Do you have a picture of it removed? Really surprised it isn't recessed.
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07-10-2016, 11:01 PM | #30 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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A Mikuni is on the Amazon Wish List. Thanks for the recon Rojo!
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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