Spark plug

[jonvolks]

Hi all. I was just wondering, I noticed that you all say to replace the spark plug from the original. I have a Jonway YY250T. what plug would I need to replace the old? Ride safe. John

[waterboysh]

I just drove mine down to the auto parts store, undid the 4 bolts holding my seat in place and removed the seat. I just removed the spark plug and took it inside and said, "I need the NGK equivalent of this plug." The guy looked something up, cross references it with what I had, and I was out the door in about 5 minutes. Stuck the new plug in and drove off.

[jonvolks]

OK Thanks to all. I will take it all in when ready to change. I only have 80 miles on it and the way the weather looks, it will be a long time before I get to ride again

[prodigit]

Why would you change it now?
If I where you, I'd ride on it for at least another 500 miles.
They're not going to go bad easily.
In fact, just re-gap the sparkplug (make sure it has the right gap), and buy one spare, and change only when the engine starts acting up, and after checking the plug went bad.

Usually a spark plug will not go bad all of a sudden. It goes over time. I have mine for over 2,5k miles and it still works fine. I bought a spare, and will be changing it as soon as the old one goes bad.

The only reason why (IMHO), people change to a new spark plug, is because of incorrect gapping. The only other reason to change the spark plug, is when either someone has messed it up, or the engine runs too lean, and the spark plug got damaged (sometimes even parts can get melted).

Other than that, just keep using it. You're not going to magically gain a lot of MPG or speed, nor gain a lot of reliability by changing it.

[wutzthedeal]

If you get something like an NGK iridium, you'll get more reliable starts on cold days and it'll last the life of your scooter. Chance of fouling and spark-related timing issues are lowered with the fine tip that is cleaned with each spark. Should be some increase in MPG, too, and can help fix/prevent knocks/pings. IMO, put quality in, get quality out.

[JR]

Feb 6, 2013 21:20:28 GMT -5 jonvolks said:

Hi all. I was just wondering, I noticed that you all say to replace the spark plug from the original. I have a Jonway YY250T. what plug would I need to replace the old? Ride safe. John

The YY250T is one of the two Chinese clone of the Honda Reflex. We are building a parts reference list here for that scooter along with other 250 models and you can see the plug that comes in this scooter along with the Iridium version as well. Both the vertical 244cc and the horizontal 257cc versions use the same plug.

Myself I run one notch hotter for better cold starts.

www.thescooterprofessor.proboards.com/index.cgi?board=250classchinese&action=display&thread=1846

JR

[jonvolks]

Thanks JR, I'll keep this in mind when I need to change. Ride safe

[ellpee]

Here's something I posted yesterday on That Other Forum that has a lot of info about my experiences changing the plug on my almost brand new YY250T (aka Roketa MC-54-250B).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Wanted to change out OEM plug on my new Roketa per general PDI recommendations. Chinglish owner manual said G7HSA, couldn't find any reference to that on line but there was a C7HSA that is for ***SOME*** 250cc Chinese scooters, so bought two of those thinking it was maybe a typo.

When I finally got around to attempting the work, found that the C7HSA takes a 16mm aka 5/8" socket, but the OEM plug needs a larger socket; my best guess was 17mm. Invested in a set of deep metric sockets as the one that came with the scoot "tool kit" is garbage. The socket set goes 10-11-12-13-14-15-16-17-19-21, so which one do I need? Ri-i-ight, the 18mm!

Jerry-rigged the cheap OEM socket to the point where I did manage to get out the OEM plug, only to find that (1) it was already an NGK so might not have needed to be replaced in the first place, (2) but not a G7HSA or a C7HSA, it was a DPR7EA-9. Not even remotely the same as the C7HSA, larger thread diameter and thread reach, and of course calls for an 18mm socket.

So, back to AutoZone, traded in the two wrong plugs for two DPR7EA-9's, and also bought the 18mm socket my new metric set was lacking. Back home, got the new plug in finger tight, then dropped my 2" ratchet extension down into the motor compartment. I can see it down there, but very hard to get to; will try tomorrow with BBQ tongs or a magnet gizmo or duct tape on the end of a stick or whatever.

So for the information of other newbies: The current (2011 or 2012 depending on whom you ask) Roketa MC-54-250B, AKA Jonway YY250T, with the Helix-clone vertical engine, takes an NGK DPR7EA-9, NOT a G7HSA like it says in their dopey manual (not sure that one even exists!) and NOT the C7HSA that maybe fits some other Chinese 250's but not this one. Some of the many cross references: A/C Delco R121XLS, Autolite 4162 or 4164, Champoin RA8Y or RA8YC, Motorcraft HG2C.

And though I finally managed to remove the plug with the flimsy 16mm/18mm socket they give you, by drilling some extra holes and using an Allen wrench for torque, a good quality 18mm deep socket, 2" extension, and ratchet make the whole thing a good bit easier.

All the above was done through the little "hatch" underneath the seat. I didn't have to remove any exterior plastic, but it's a tight fit, maybe impossible if you have really big hands, and expect to lose a little skin along the way. And for heaven's sake hold onto your socket and extension and any other small object, because once it falls down inside there, getting it back out will take some ingenuity.
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