Post by ellpee on Feb 12, 2013 20:28:00 GMT -6
Moving this from another thread so the title will better reflect what's going on.
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.
Oh, and finally a question for the old heads: the OEM plug was pretty black after barely 200 miles, more so than I would've expected, but all my spark plug experience has been with cars. Does that tell me anything ominous about my valve or mixture settings, or it is normal for the break-in period? As far as I've been able to tell the scoot has been starting and running fine, but I don't claim to have a fine mechanic's ear and have never ridden any other scooters to give me a basis for comparison.
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.
Oh, and finally a question for the old heads: the OEM plug was pretty black after barely 200 miles, more so than I would've expected, but all my spark plug experience has been with cars. Does that tell me anything ominous about my valve or mixture settings, or it is normal for the break-in period? As far as I've been able to tell the scoot has been starting and running fine, but I don't claim to have a fine mechanic's ear and have never ridden any other scooters to give me a basis for comparison.
..BAD TO THE BONE..