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Honda: INNOVA125i(2010); CBR250R(2013)
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Discussion Starter · #21 · (Edited)
... i would suggest/request you guys to do the pressure test on another CBR250R as I don't have the tools, in this way we can clear fact about pressure drop in our bike.
Vishal993 Thank you very much for your help.
Of course, it is NOT worth checking and disassembling and touching the engine if there is no fault that requires it. But if there are volunteers for testing, you will be blessed. Or anyone who bring us qualified information about "Pressure Drop in the Fuel Hose 2 sec After Switch ON (Engine OFF)", will also be blessed.
It's Normal OR it's a Problem???

I bought: Two quick-fuel line connectors with a diameter of 6.35, male and female, an extension hose for a bicycle air pressure pump, a T-manifold, and a fuel hose.
(I had a tire pressure gauge and I took out from it the one-way valve).
...And connected tha all parts like this:
44819


Another short video I made on the subject
"DIY fuel pressure gauge":

The easiest way is a quick T connector, but I did not find one sized 1/4 "(6.35mm). The item in the picture is sized 0.31" (7.89mm):
44822
 

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Honda: INNOVA125i(2010); CBR250R(2013)
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Discussion Starter · #22 ·
Today I raised my question on Partzilla YouTube channel, on John Talley live broadcast, and you will find John's answer at 7:58: In his opinion this is a problem.
Thank you John!
 

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Honda: INNOVA125i(2010); CBR250R(2013)
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Discussion Starter · #24 · (Edited)
That's what need to be figure it out.
YES, the issue should continue "need to be figure it out".
There is a possibility of a combined problem:
1. (👎)A pressure leak (something internal in the pump parts that are inside the fuel tank?).
2. Or that:
difficulty starting is most likely IAT.
Since the engine has no problem accelerating nicely at high rpm, I assume the pressure drop problem due to some internal leakage in the pump structure is a possibility that has already been sustained (ruled out👎). The pressure drop in this particular model is normal.

Additional opinions are welcome, thanks in advance.
 

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Honda: INNOVA125i(2010); CBR250R(2013)
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Discussion Starter · #25 · (Edited)
That's what need to be figure it out.
Due Diligence: John (Partzilla) have an amazing and helpful show, and I love it very much!!! John did not get the full picture from me, because during his live broadcast you can write him a message limited to 200 characters. John answered what you(Vishal993) and I understood, this is the default: Building pre-pressure to help engine starting. It turns out that our model does not have a unidirectional valve, and the pressure drops from the maximum to 0psi within about 60 seconds. During that time a certain pressure is maintained in the fuel hose and helps to efficiency the engine starting. There for, in the motorcycle tec book we find the usual guidelines for "FUEL PRESSURE RELIEVING" (p. 5-33):
Motor vehicle Font Paper History Paper product

In the motorcycle tec book there are no instructions for testing the pressure drop in the condition of the engine off, this is my personal initiative, because I understand, so are professional mechanics, that such a test is required. Well, now there is my test🧐. It turns out that this test is neither important nor relevant to our model and the normal response to that not relevant test is:
In the engine off there is a full pressure drop within about 60 seconds.
 
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