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Old 05-18-2018, 12:10 PM   #1
Derek Hanna
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Saito gas conversion - carb experience?


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Anybody used a walbro carburetor or similar for a Saito gas conversion? Model used / experience setting up? (Most of the Walbro pumper carbs appear to be designed for 2-stroke applications, but there may be some 4-stroke compatible models)
I have a Saito 300 twin that I'm considering for conversion to gas. Currently have purchased an Rxcel dual ignition for it, so will first try out on glow fuel using the stock glow carb. (Appears to be 10 mm throat.)
I'll try some of the other forums also.....
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Old 05-18-2018, 06:58 PM   #2
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Re: Saito gas conversion - carb experience?

Quote:
Originally Posted by Derek Hanna View Post
Anybody used a walbro carburetor or similar for a Saito gas conversion? Model used / experience setting up? (Most of the Walbro pumper carbs appear to be designed for 2-stroke applications, but there may be some 4-stroke compatible models)
I have a Saito 300 twin that I'm considering for conversion to gas. Currently have purchased an Rxcel dual ignition for it, so will first try out on glow fuel using the stock glow carb. (Appears to be 10 mm throat.)
I'll try some of the other forums also.....
check this

http://www.youtube.com/playlist?list...vZUD0FEBUoOvvG

I may have a little to share
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Old 05-19-2018, 10:52 AM   #3
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Re: Saito gas conversion - carb experience?

Thanks for the video link. I see it's generated lots of interest.
It looks like you're making good progress with conversions without switching to ignition.
Do you have information or description for the Walbro carb used on the OS 90 conversion? In some cases, one may know the original application.
How was the pump configured? i.e. what source of pressure do you use?
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Old 05-19-2018, 11:20 AM   #4
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Re: Saito gas conversion - carb experience?

you can find everything here to convert Saito to gas...

https://www.ch-ignitions.com/
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Old 05-19-2018, 11:35 AM   #5
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Re: Saito gas conversion - carb experience?

I've only found ignitions (to support Saito gas conversions) on that site.
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Old 05-19-2018, 11:49 AM   #6
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Re: Saito gas conversion - carb experience?

From CH site...

"You can use our versatile ignitions over any engine including the famous Saito, Moki, 3W ,OS ,ZDZ,ROTO engines. Here is just a small list of engines our ignition can be used to convert.
If your engine is not on our list please contact us and we will make that conversion engine FREE, just pay the shipping back and forth. We are a phone call away 561 927 6171"


your engine is there just not on the web site, contact him
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Old 05-19-2018, 05:44 PM   #7
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Re: Saito gas conversion - carb experience?

Quote:
Originally Posted by Kargon View Post
you can find everything here to convert Saito to gas...

https://www.ch-ignitions.com/
everything except for the gas carb.. they sell the ignitions for their gas engines.. or if you want to convert the nitro engine to a spark ignition ,, which BTW is very popular.. they don't sell nitro to gas conversions..

I will be back with more later as soon as I find some pics and get use to this new keyboard.. old one was giving me to many spelling errors..

but be prepared.. there is a lot more to a conversion besides just changing the fuel and carb.. the os 91 four stroker that I pictured .. uses a spark ignition .. with a hobby king ignition and the carb is a 15cc carb.. from again hobby king.. but using a warbro carb on a four stroker is tricky.. the 15cc is I think a bit over sized..
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Old 05-19-2018, 08:53 PM   #8
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Re: Saito gas conversion - carb experience?

I can't see using a Walbro 2-stroke carb on a Nitro 4-stroke engine. You don't have the necessary crankcase compression/vacuum cycle to generate the in/out action on the pump diaphragm.

A typical Walbro 4-stroke carb, found on honda and toro 4-S weed whackers uses intake manifold vacuum and a small spring under the diaphragm to achieve a similar in/out pump action.

I'd convert to ignition but continue running Glow fuel. The Idle and transition are amazing and there are far fewer flameouts. Plus you can run FAI, or 5% nitro fuel and save money.

I haven't done any 4-strokes but I've converted two ST 3250 2-strokes.....One using a CH ignition with syncro spark advance and the other using an RCexl ignition.

Good luck with the mod.

Cheers,
Den
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Old 05-19-2018, 09:30 PM   #9
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Re: Saito gas conversion - carb experience?

You can use any walbro you want provided it's in the correct size range you just need to allow the pulse port of the carb to enter the intake . most four cycles do this by milling a channel in the insulator between the carb and intake . you will need a very small carb though , you can get a small rotary barrel carb from most any of the newer 4 cycle string trimmers , I am sure they would be ok . I have roto /valch/kolm/saito/torque pro/NGH . and a few of my own home built gas four cycles and they all have walbro carbs. all my engines have standard 2 cycle carbs , some 4 cycle engines do benefit from external fuel pumps but only because the pulse line can become plugged with oil . I just converted a saito 270 to gas and it worked very well .
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Old 05-19-2018, 10:07 PM   #10
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Re: Saito gas conversion - carb experience?

jsparky, .look again on the CH site under engine conversions, that's what they do, they convert nitro to gas and sell complete conversion kits with gas carbs
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