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Scooters - 125 to 300 => Agility 125 => Topic started by: kel520 on April 12, 2020, 03:11:25 PM

Title: 125cc city to 160cc cylinder head ?
Post by: kel520 on April 12, 2020, 03:11:25 PM: Hi Guys, brought the Naraku 160cc big bore and also the Cylinder Head 160/180cc NK600.38 all was going well until I noticed the head is shorter than stock making the timing chain to slack and the cam housing short of the studs.
Ended up putting the stock one back on, pity cos the ports were much bigger and head machined better match to piston.

Just wondered if anyone else has come across this and indeed if I've the right head or have to make do with the stock one.

Though I've not road tested it yet, its running sweet enough.....it seems.
Title: Re: 125cc city to 160cc cylinder head ?
Post by: TBR125 on April 12, 2020, 05:33:44 PM: I'm looking at getting a big bore kit for my agility 125. Did that cylinder fit in the crankcase without milling? I only do bolt on mods.
Title: Re: 125cc city to 160cc cylinder head ?
Post by: kel520 on April 12, 2020, 06:43:15 PM: Yeah this one's fine,drops in no problem the 160cc that is. Did make the mistake of ordering the 170cc though it fits some 125's not the agility city not without milling the case as you mentioned. The original 125 head obviously fits, but it would have been better to have had the 160/180 head with the bigger ports, but hey.
Title: Re: 125cc city to 160cc cylinder head ?
Post by: JJJoseph on April 13, 2020, 08:04:54 AM: Quote from: kel520 on April 12, 2020, 03:11:25 PM
Hi Guys, brought the Naraku 160cc big bore and also the Cylinder Head 160/180cc NK600.38 all was going well until I noticed the head is shorter than stock making the timing chain to slack and the cam housing short of the studs.

Send it back for a refund! Most vendors understand how this works, and will fix it for you.
Title: Re: 125cc city to 160cc cylinder head ?
Post by: Rorut on August 22, 2023, 09:08:18 AM: Quote from: kel520 on April 12, 2020, 06:43:15 PM
Yeah this one's fine,drops in no problem the 160cc that is. Did make the mistake of ordering the 170cc though it fits some 125's not the agility city not without milling the case as you mentioned. The original 125 head obviously fits, but it would have been better to have had the 160/180 head with the bigger ports, but hey.

What top speed do you get with that cylinder kit? I have original 150cc on my agility city (sold as that in my country). I get 95km/h
Title: Re: 125cc city to 160cc cylinder head ?
Post by: Tilos on August 22, 2023, 09:42:10 AM: Quote from: Rorut on August 22, 2023, 09:08:18 AM
What top speed do you get with that cylinder kit? I have original 150cc on my agility city (sold as that in my country). I get 95km/h

Hi, its about the same. I have airsal 160ccm and with 11.5gr rollers do about 100km/h(odo)
Title: Re: 125cc city to 160cc cylinder head ?
Post by: JJJoseph on September 19, 2023, 08:33:39 PM: Quote from: Rorut on August 22, 2023, 09:08:18 AM
What top speed do you get with that cylinder kit? I have original 150cc on my agility city (sold as that in my country). I get 95km/h
A big-bore cylinder kit has no effect on your top speed.