MSefi.com read only forum (Jan.15,2018)

Going off topic a bit here but just to keep it all in the same thread... What is the deal with sourcing injectors to fit certain throttle bodies? I mean injector physical size and fitting rather than flow rate. I have searched a lot and cannot seem to find any info on this. Do injectors tend to be ...

A short update on where my thinking is going... I've been researching the issue of secondary throttle valves and controlling them using an rpm based frequency signal. I havent made much progress on the electronics side but I have come across several cases where guys removed the secondary throttle ...

Haha! Yeah they were all pretty bad alright. Whoever was at them before did a good job of trying to make sure they wouldnt come out again! Replaced them with allen head screws though so its all good. Theres no need to stress about going at them anymore. Trekkie they are JIS alright. They had the ...

Don, I see what you mean now. Though I'm not sure if it would work that well on my CBR... My main jet and emulsion tube are the only things that come out and the passage is not very big (probably 6mm). It also meets the needle jet at an angle so the spray would need to turn a corner as well as flow ...

Yeah I was thinking they could also be PWM controlled. All this is purely guesswork. I really won't know the parameters of the secondary butterflies until I have a set of throttle bodies in my hand and can do some tests on them. For simplicity sake I think I will try to remove them first and see how ...

I have been thinking some more on the CV slide/secondary butterfly issue over the weekend. I hadnt seen it as an issue until you mentioned it EWflyer but you have got the cogs turning in my head.

I've thought about the idea of building a circuit to control the butterflies based on vacuum to ...

Thanks EWflyer! I know not many have done small bike conversions and as far as I know, I am the first to try it with a CBR250. I was really trying to get a feel for the general andvantages/disadvantages of various TB/injector configurations.

After more thought now I am leaning towards adapting ...

Edit: I believe its GSR400 and not GSX... my bad.

Hi all,

After doing more research on my cbr250 efi project, I've come up with a few queries...

For now, it seems the best way of converting the bike to efi is to modify the existing carbs to mount the injectors where the CV slides used to fit. I am tending to like this idea because it seems to be ...

Thanks EWflyer! :) Its an amazing bike alright and I love it to bits! So much so that Ill be buying a second one come Christmas time! :D They arent as rare here in Ireland as you might think though. There were quite a few imported in the 90s from Japan but they are starting to get rare again as they ...

Ok. That sounds good. It makes things that bit easier from a hardware perspective. Were you sharing the sensor between the MS unit and the temp gauge? I'm wondering if the sensor would like being shared...

he IAT sensor isn't a problem. I will just buy one of the GM sensors for that and since I ...

Thanks Lance! I'd better get more familiar with TunerStudioMS so. :)

It looks like I will need to do some tests on my stock sensor to see if it can be used. I see in the manual that sensors without a separate earth connection (grounded to the frame) are not reccomended... I wonder if I were to ...

Hi guys,

I'm new to this EFI thing so trying to learn a few bits before actualy putting it into practice. I own an mc22 Honda CBR250RR which is currently carburetted as standard. A few years ago I came across a website where a few guys allegedly attempted to fuel inject the earlier model CBR250 ...