Honda NSR 125 engine options

Alphaoneee · L Plate Warrior Joined: 17 Aug 2013 Karma :

Hi,
I have an Honda NSR 125 '91 without the engine, i need the engine and i wonder what engines will fit (beside the original,without or with engine mounts modifications)?
Will the engine of an Aprilia RS 125 fit?

G · The Voice of Reason Joined: 02 Feb 2002 Karma :

Some at least of the Aprilia engines have the chain on the 'wrong' side.
They certainly won't fit straight in.

You'll have to get measuring engines, I'm afraid.

The NSR one is the only one that will as far as I know.

Timmeh · World Chat Champion Joined: 01 Nov 2006 Karma :

take your pick
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

Matt- · World Chat Champion Joined: 19 Jul 2012 Karma :

Just source a GOOD Honda jc20 nsr again. If possible you should look for a low mileage engine with no restrictions.

With correct jetting, modified airbox and a decent pipe ex, Arrow (cheaper choice for your bike) or the jolly moto pipe a slightly more expensive option but you shall get a better power gain and better build quality, with this setup you should get good power and still have Honda build quality.

You can get big bore kits for the nsr engine ,however,locating a good one has proven very hard.

if your serious about the engine change, having a tape measure handy at all times is required. My road legal TZR pitbike was a pain in the ass, but was totally worth all the time,effort, and money!

Matt,