Here's my RGV250 carbs, ready to be installed on my H1.
Testing starts tomorrow. These carbs have bleed type needle jets.
PK
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| TM34SS http://www.kawi2strokes.com/forum/viewtopic.php?f=14&t=698 |
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| Author: | P.K. [ Fri Jul 29, 2011 4:30 pm ] |
| Post subject: | TM34SS |
Here's my RGV250 carbs, ready to be installed on my H1. Testing starts tomorrow. These carbs have bleed type needle jets. PK
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| Author: | H2RTuner [ Fri Jul 29, 2011 11:11 pm ] |
| Post subject: | Re: TM34SS |
Too bad they aren't primary types. |
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| Author: | P.K. [ Sat Jul 30, 2011 8:31 am ] |
| Post subject: | Re: TM34SS |
Like a glove... Only a small conflict between the throttle cable and the petcock which will go away once I make shorter intake adapters. And the best part is that the jetting is really close. I took it for a short test drive even before syncronizing the carbs. Easy takeoff, powerwheelie on first accelleration (almost tipped me over) and went straight to 9500 RPM in 3'rd. Just a little rich between 1/4 and 1/2 throttle. Now I'm gonna drop the needles 1 notch and sync the carbs before going again. Hopefully the rich condition will be gone and I can start listening for pinging. Btw, these carbs have built in power jets. PK 
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| Author: | P.K. [ Sat Jul 30, 2011 2:33 pm ] |
| Post subject: | Re: TM34SS |
Does anybody here know which way air jets work? I'm guessing Bigger=Leaner. And also, at what throttle opening do they have the most effect? The tuning manual only say that they are for fine tuning and primarily together with bleed type needle jets. PK |
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| Author: | Ja-Moo [ Sat Jul 30, 2011 2:34 pm ] |
| Post subject: | Re: TM34SS |
P.K. wrote: Does anybody here know which way air jets work? I'm guessing Bigger=Leaner. And also, at what throttle opening do they have the most effect? The tuning manual only say that they are for fine tuning and primarily together with bleed type needle jets. PK Most guys seem to put in the largest air jet, and work from there..... |
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| Author: | mraxl [ Sat Jul 30, 2011 4:04 pm ] |
| Post subject: | Re: TM34SS |
Air jet primarily affects 3/4 to WOT.... same as mains. |
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| Author: | P.K. [ Sat Jul 30, 2011 5:20 pm ] |
| Post subject: | Re: TM34SS |
OK, thanks. The RGV250 carbs comes with 0.6 air jet on the main circuit. There's also an air jet bypass which is opened and closed by the ECU on a RGV250 (solenoid). I have plugged the bypass and will try to find an allround air jet size. Same goes for the pilot circuit. There is no pilot air screw. Instead there is another air jet that meters the air for the pilot. There's also an air jet bypass for this circuit which I have plugged. I will have to tune the pilot circuit using different air jet sizes instead of a screw. From what I've heard, the RGV250 ECU opens the pilot air jet bypass when the RPM exceeds 2000. PK |
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| Author: | Johan [ Tue Aug 02, 2011 5:53 am ] |
| Post subject: | Re: TM34SS |
P.K. wrote: From what I've heard, the RGV250 ECU opens the pilot air jet bypass when the RPM exceeds 2000. PK That depends on the SAPC model. According to this page, http://www.rgv250.co.uk/index.html/_/articles/sapc-explained-r19, some boxes open the pilot air valve between 500-2000 rpm and some between 2000-6000 rpm. 500-2000 rpm seems to be most common. As I have understood it, the pilot air valve is open in that range. And it is closed in the other rpm ranges. That's why racers blank off the air valve, because the benefit is anyway at low rpm. |
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| Author: | P.K. [ Tue Aug 02, 2011 11:11 am ] |
| Post subject: | Re: TM34SS |
Johan wrote: P.K. wrote: From what I've heard, the RGV250 ECU opens the pilot air jet bypass when the RPM exceeds 2000. PK That depends on the SAPC model. According to this page, http://www.rgv250.co.uk/index.html/_/articles/sapc-explained-r19, some boxes open the pilot air valve between 500-2000 rpm and some between 2000-6000 rpm. 500-2000 rpm seems to be most common. As I have understood it, the pilot air valve is open in that range. And it is closed in the other rpm ranges. That's why racers blank off the air valve, because the benefit is anyway at low rpm. Thanks for the link Johan. It's always nice to know how it's supposed to work even though I'm not trying to replicate it. These carbs immediately became my new favorite carbs. They are simply amazing. I have ordered some larger main jets and some different sizes of air jets and I will start fine tuning as soon as I get them. I also have to fabricate a new starter cable. I bought two new starter cables for RGV250 and ordered a DIY kit for making throttle/starter cables. Should be able to make something form that. PK |
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| Author: | Ja-Moo [ Tue Aug 02, 2011 11:41 am ] |
| Post subject: | Re: TM34SS |
They seem rather complicated compared to standard VM's. And there is no porblems with them......... 
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