Re: Honda Dio, Activa and Aviator

the 3g activa uses a 10 inch rim, not sure where you got the info on a 90/90-12 (12 stands for rim size).
90/100-10 is the correct size and should be fine on the activa/dio.

It is the aviator and activa 125 iirc use the 90/90-12 size at the front.

Re: Honda Dio, Activa and Aviator

I have activa 3g 2015. I have bought a set of MRF tyres for my activa. But the shop owner suggested me to install 90/100-10 on both front and rear. But when i searched on the internet the front size is 90/90-12. How will it effect my ride and in worse conditions will there be majour changes in handling? Should i continue with the install on 100/10 on both?

Re: Honda Dio, Activa and Aviator

It will supply the engine oil from the pump to cylinder head (for valve, camshaft and cam chain lubrication).

Re: Honda Dio, Activa and Aviator

Please advise the role played by the hole, being indicated by orange arrow in this picture.

Re: Honda Dio, Activa and Aviator

thanks for the update on parts.
ngk plug for the older 102cc activa/dio is cr6hsa.. which is what i own.
you can get the part no. for ngk plugs from here for various bikes in india https://www.ngkntk.in/partfinder/
these days plugs are easily available on amazon.. in some places local parts dealers might not stock ngk, many i see tend to go with bosch for plugs.
looks like ngk is the oem plug for these honda scoots since the past cpl of yrs, they have a new model of plug mr7c-9n


i use system g/adon p now n then on my dio (i regularly use it on my duke) and i don't feel a difference per se while riding. mine (2007 model) has now clocked over 75k on stock engine without any issues.. never used additives in the first few yrs and never had any problems either, only been using system g/adon p say once in 3 months for a tankful the past 4yrs just because i have it lying around . what is more important is that the scoot gets serviced regularly at 2500-3000km intervals with oil changes. i can safely say system g/adon p will not cause any harm per se.. you can give it a try and see.. but 2t premix will be a better top end lube and make sure you use very less as i mentioned.

on another note, my mechanic sometimes (Say once every 3 services/2 yrs) squirts a few drops of oil thru the rubber pipe near the engine with the engine running and revs it up a bit.. will see smoke for a few seconds till the oil burns away and according to him frees up the piston rings (i did notice a wee bit improvement in peppiness). but i have since avoided this for fear of having excessive carbon deposits built up. 2t oil mix in fuel is better since it burns much cleaner.

Re: Honda Dio, Activa and Aviator

What about fuel additives, System G or Adon P, in Activa ?

Re: Honda Dio, Activa and Aviator

Thanks.

I would add 20 ml 2T oil in full tank for lubrication during run-in.

Original Valve Seals ₹75.00

Gasket Sealant ₹20.00

Usha 0.25 size rings for Activa 110 ₹300.00
(I had had a look while being installed on another Activa in one open Standard size set in ASC, it was having Usha Rings inside Honda packing,)

I had tried Standard size rings first, but they were having bigger gap, so I had to plonk in a 0.25 size one.

Which exact NGK plugs you had received from Sibun ?

Could you share the NGK part/ model number, please ?

regards

Re: Honda Dio, Activa and Aviator

Hahaha good old days.

Yeah remember.

Had sent the plugs.

Re: Honda Dio, Activa and Aviator

i would have first gone with new stock size rings, but anyway do keep an eye out and let us know how it holds up.
also maybe you could run say 20ml 2t oil to a tankful of fuel (20ml in 6 liters of fuel approx)i.e. for around 200-300 km to give it some upper cyl lubrication during run in due to the oversize rings you've plonked in.

btw, did you get oversize rings from honda spares itself or was it an aftermarket one like usha ? and how much did they cost.. a bit of details on the spares would help us.

changing oils and expecting wonders.. spot on !
btw, i still have one ngk plug remaining from the ones you sent me a few yrs ago love the quality and reliability of these ngk plugs.

Re: Honda Dio, Activa and Aviator


Finally a guy who followed what we said in forum. Love your enthusiasm and labour to correct problem. All must learn from you. Other wise most are busy in changing oils and expecting wonders.

As for coil, you can check it by opening spark plug cap and testing the spark strength to body, if that is bluish and strong then your culprit is plug cap and spark plug.

Re: Honda Dio, Activa and Aviator

Thanks for the reply /suggestions.

Today, I opened the engine (DIY enthusiast, inspired & guided by [MENTION=28527]sibun[/MENTION], [MENTION=29030]Pinaki[/MENTION], [MENTION=53807]paul.1911[/MENTION], n many more) again.

Earlier, I had opened the head, polished the valves and installed new valve seals. Bike has run for around 65,000 km.

So today a next oversize ring set (0.25) was installed by hand-grinding using a 320 grit waterproof sandpaper, on the existing stock (standard size) piston assembly. Only a small gap was kept so as to just let fine streak of light to pass through the new rings (0.25) in the existing bore. Everything installed back. (older standard ring had developed gap of 2mm.)

After a test run for 15 kms, the white bluish smoke being emitted had completely vanished and the spark plug was found dry and threads had also dried up.

Now only black sooty deposit on plug was evident, which was cleaned and reinstalled.

Activa has now been tuned optimally.

Another test drive would confirm if the problem has vanished completely.

As the spark is yellowish red in the plug, next on the platter is checking up of the HT Ignition Coil & wire with plug cap. With that I suppose proper spark would be restored in the bike.

Thanks again & regards.

Re: Honda Dio, Activa and Aviator

time to dig into the block/valves and see if they are causing the issue. sometimes just replacing the piston/rings might fix the issue, but again it's a risk and difficult for one to simply make a guess without inspecting the parts. considering the labor involved and risk.. most simply go ahead with plonking in a new block+piston and valves etc... if it is smoke with a bluish tinge that you are seeing, it is oil burning.
another thing that comes to my mind is, why not try and plonk in a new head gasket and see if that fixes the problem before going in for a top end rebuild.

Re: Honda Dio, Activa and Aviator

Now, Activa 109 cc is emitting white smoke on increasing accelerator.

Earlier it was giving black smoke, but it stopped after valve seal change and valve polishing.

Please suggest if change of bore kit required or simply the change of only ring & piston may do the needful.

Can smoking be controlled by some other way ?

Can there be some other reasons for a smoking Activa ?

How to check the ignition coil , plug cap & wire (it produces yellowish feeble spark and sometimes misses as well) whether they are working okay, then spark plug gets blackened easily and the machine gets shut.

regards

Re: Honda Dio, Activa and Aviator

I am not looking for long life. I am looking for better grip, more effective braking and more stability in wet conditions. I do not mind changing tyres frequently as long as these are met. The dealer informed me that the MRF Meteore that I have installed will give me better grip as compared to the MRF Zapper that I had. I wanted a soft compound rubber and not a hard compound rubber. I hope that I am not wrong in choosing MRF Meteore for this.

Re: Honda Dio, Activa and Aviator

yep, the zappers at the rear do go out at around 12k km.. they are softer compounds.
these mrf meteor should last you a bit longer.
and glad that it was just a valve replacement that fixed the issue.