Re: Honda Dio, Activa and Aviator

Wonderful, so cleaning did work its magic. Jets and carb crevices are so tiny even a small gum up somewhere can ruin the total performance or fuel and air feed to the engine. Now that the problem has been sorted, try using an inline fuel filter if you frequently change the fuel station or you know the fuel you use is pretty much not the finest. Keep a tab on it for a few days though.

Cheers!
VJ

Re: Honda Dio, Activa and Aviator

Good news,the issue has been resolved,we completely disassembled the entire carburetor and cleaned every thing(was a time consuming job) including all the jets and all the holes on the carb were air blasted,now the AFR is responding againNothing was replaced,but still couldn't understand what went wrong in the first place.

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the TPS was fine as you said,now its idling fine;after cleaning the carb.

Re: Honda Dio, Activa and Aviator

Tps won't affect the idling, check if the afr screw was replaced along with the oring and the spring that sits at the beginning end of the afr screw. I had a similar problem of the carb not responding to a tune, but it turned out to be a fuel cock problem

Re: Honda Dio, Activa and Aviator

Sure, give it a nice clean wash, reinstall everything, (but keep the spare handy) and give it a try. Most probably if she kicks back with the same problem, with the same old jet, then replacement is the only good solution.

Cheers!
VJ

Re: Honda Dio, Activa and Aviator

Oh,there is been a mix up,I think you got me confused with someone else All I have is a dio.
I will swap the tps and check it out,sounds simpler,the air filter was changed 4k km back,I understand its hard to say without hearing the sound,its more of a hissing sound,let me see if I can record the same,If it matches I will post it.
I heard that AFR setting can be tricky,how many turns from full tight for optimal power,then I could set idle speed accordingly with the tachometer,the thing is after the carburetor swap I am feeling a slight loss in power,the mechanic guy set it by listening to the engine,he never uses a tachometer,he said it is at the best setting and I know he will set it the same way for my carb too.He is not a fan of speed,so there is no point in arguing with the man.

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thank you for the detailed info,now the scooter is running fine on another spare carburetor(for testing only,still have to return it).
If that's the case as you mentioned,I might have to replace the entire carburetor right?. Will clean and test my carburetor again,will post what happens.

Re: Honda Dio, Activa and Aviator

Since you've mentioned you've drilled out, the aluminum casing -- AFR jets are very sensitive to even the slightest movement. Erratic and high idling usually always means we have a leak somewhere or improperly tuned engine, and it's even more plastered since you've mentioned the engine had no effect on the turns. This can and might be a reason, as the screw (aluminum casing) diameter itself might have become bigger to cause slight differences in the ratio. Most probably the carb body where it houses the AFR screw might be damaged or the diameter might have gone bigger. Keep us posted.

Cheers!
VJ

Re: Honda Dio, Activa and Aviator

oh, i thought we were still talking about your '08 activa. did not notice that you mentioned a dio.
i do not know how to exactly test the tps (i mean each vehicle will have a different set of readings i.e. voltage/resistance values). Maybe if the workshop has a workshop manual (Which they usually do, but never take out often) you can check it for information.
Otherwise simply swap the tps like you did the carb and see if that fixes the issue. that would be simpler than finding info on the tps and hooking up a multimeter.
As for the air suction sound, I can't say much without hearing it or inspecting the scoot. Check the air filter/replace it if its been more than 6k km.

Re: Honda Dio, Activa and Aviator

thank you,
I will get a new screw and carburetor gasket,but it worked fine for one year after the drilling.I have a 2013 dio it has a TPS,Is there some way to test the TPS?
There is a air suction sound when idling;at low rpm,I never gave much thought to it,is it normal?

Re: Honda Dio, Activa and Aviator

I don't think there is a tps on the old activa.
bad idle could be due to air leak somewhere.. possibly that drilling or a bad sealing of the carb.
try to get a new screw(and rubber washer if any) , the carb rubber gasket and clean carb thoroughly, put it back together and see if it works.

Re: Honda Dio, Activa and Aviator

thank you for the reply,
I checked with the mechanic who installed the fuel petcock,the vacuum hoses and manifold were fine.He tired to adjust the AFR screw today and ran into a bigger problem,the AFR screw,it was not responding;the screw was turning but engine was not responding to the turns,the throttle screw is working fine but rpm was still fluctuating as before.
Finally,the mechanic decided to swap the carburetor for testing only;he had one in reserve(I have to return it) but kept the jets and AFR screw from my carburetor and it was working fine after that,it turns out my carburetor is the culprit.But I still have no clue what happened to it,the bowl was clean just like brand new,the jets were also fine.
About a year ago the AFR screw was replaced as the old one got stuck and we had to drill it out could that be it,other than that the only thing left to test is the TPS sensor,but can it go bad just like that and does it effect the rpm?

Re: Honda Dio, Activa and Aviator

Check if your vacuum hoses if any on the carburettor are installed properly, and did they fiddle with the carburettor setting or did they remove the carburettor? If yes, get the manifolds tightened properly and if they filled with the AFR mixture, I'd suggest get that checked too.

Cheers!
VJ

Re: Honda Dio, Activa and Aviator

Hello,I got a problem with idle rpm speed on my dio,its varying continuously.it goes as low as 680rpm and the next few seconds it climbs above 1800rpm and in the next second it falls to 1000rpm or below and the whole process repeats again,I can hear the engine sound rising and falling when I listen carefully.I used a digital tachometer to check it,earlier it was a steady 1600+50/90 rpm and never fell below 1600.
Not sure if its related to the fuel petcock which was changed few days back as it was leaking and I noticed the rpm issue this morning,after a ride.
Can someone help me out

Re: Honda Dio, Activa and Aviator

Not sure if they did the test you mentioned - i got them to open the hatch and tested with the multimeter. Hope nothing else is wrong (wiring harness etc)

It was some 520 INR

Re: Honda Dio, Activa and Aviator

Cool, just as suspected. But did they do a before (with old rr unit) and after (with new rr) voltage tests?
btw, how much did the rr unit cost ?

Re: Honda Dio, Activa and Aviator

Hi
Finally got the SVC to replace the RR unit which seemed to be the culprit in this case. Checked with a multimeter at the time of delivery and the voltage showed 12.7 with ignition off and went upto ~13.6 after starting the engine and even higher when the engine was being revved.

Will keep you posted