（保养篇之十一）VFR80 VTEC 电喷嘴清洗

zuohongqing

Greetings one and all,

This is a guide on having your fuel injectors on your VFR800 cleaned. It is specific to the 6th-generation VTEC model, but should be almost identical on a 5th-generation VFR.

I will build this post up in stages, starting with just my videos and the increase in flow rates from the cleaning, followed later by the pictures. So let's get into it.

The first thing we need to do is remove the fuel tank. Best to get this sucker as empty as you possibly can before removal, as when you loosen the banjo bolt from the fuel pump and the fuel return line whatever is in the tank is going to come out as fast as it can. Next up is removal of the airbox, which has been covered many times before so we won't repeat it.

Make sure you don't put your fuel in a container of contaminated fuel - put it in something clean and dry. You really don't want your bike to run like crap AFTER you clean your injectors.

We're really getting into it when we remove the fuel rail. You need to remove the injector electrical plugs first. The "latch" on these connectors is on the under-side. Once you have done that, you can remove the four 8mm bolts and gently and slowly lift the fuel rail away. If an injector comes with it, hold the injector down while you gently lift the fuel rail off it. It will pop slightly as it slips past the O-ring on the injector.


Removing the fuel rail. Red first, green second!

The fuel rail itself is made up of a few pieces. Don't twist it or wiggle it about or you may damage the O-rings keeping the pieces sealed under fuel pressure.

The fuel rail is essentially two pieces joined together by a pipe. The pipe is only secure by O-rings, so unless you want to replace those too, don't go yanking the fuel rail around and damaging them!


You need to pull those injectors out nice and slow so you don't lose any rubber bits down into the guts between the V of the motor, or into the motor itself!

Injectors removed and waiting for servicing

Check out the injector nozzle.

They weren't kidding when they said the 6th-gen has 12-hole injectors


On the injector, the most likely part which will need replacing is the large rubber grommet you can see here near the electrical connector. It's a dust seal, and gets crushed by the fuel rail. Mine had degraded a fair bit, but the nice injector cleaning man said he had plenty of those in his stock.


When all the injectors were off, the injector cleaning guy put them on his ASNU injector diagnostics rig handily mounted in the back of his van. All he needed was some mains power, and we were off.







And the results - a 7% increase in flow (but see below for the hidden problems with my injectors I discovered later):


Injector cleaning flow report


Before leaving, the cleaning guy replaced the filter in each injector as part of the job. I replaced the upper O-rings myself from Honda stock (Part code 91301-P7A-004 on all 6th-gen VFRs regardless of year. You'll need 4!)

Finally I installed the cleaned injectors back into the bike. I lightly lubed all seals and O-rings with a smidge of clean engine oil (as per industry recommendations) to ease insertion. As they say, you can never have too much lube!

Clean injectors, installed and ready for the fuel rail.


Update: Problems with my injectors!

It turns out my injectors were corroded and cleaning them has lifted goop out of the "pits" left by the corrosion, causing leaky injectors!

This is not the fault of the clean - one or more of the injectors were beyond help and living on borrowed time. My only option was to replace my injectors with a matched set which all have the same flow rate.

信丰滴

版主辛苦了.....继续支持你....

438285343

版主辛苦了.....继续支持你....

438285343

很详细的技术贴，每天一顶

两轮跑跑

恩，经典

犀利哥哥

{:soso_e179:}....................................

上海阿伟

老左的帖子必须顶

清远小刘

這個繼續必須頂起來

qq779822586

说的真好，就是看不懂{:soso_e144:}

摩族一家

{:soso_e179:}

（二档）

要是能翻译过来就更好了

心情客栈

{:soso_e179:}

zx998

{:soso_e179:}