Planet Minis

MAZZ77X · 06-05-2009, 08:18 PM

I'm sure this has been discussed somewhere before but the search came up with nothing so here it goes......

I have been reading the threads on the XR100 swaps and want to know if a horizontal CRF 50 based engine has ever been done?

Seems like a better choice with all the power combos from mild to wild and it's a lighter engine. You could easily bolt in a Chinese YX150 and have 12 HP and all the torque you need for less than $400.

NCNSR · 06-05-2009, 08:21 PM

Quote:

Originally Posted by MAZZ77X

I'm sure this has been discussed somewhere before but the search came up with nothing so here it goes......

I have been reading the threads on the XR100 swaps and want to know if a horizontal CRF 50 based engine has ever been done?

Seems like a better choice with all the power combos from mild to wild and it's a lighter engine. You could easily bolt in a Chinese YX150 and have 12 HP and all the torque you need for less than $400.

Quite a few there was a guy in cali who did it and they actually sell the brackets in japan. The issue is the front wheel hitting the head.........http://img221.auctions.yahoo.co.jp/u...vxcfw20823.jpg

jsu101 · 06-05-2009, 10:25 PM

yes that is true and its the same thing on the ysr

big pete · 06-05-2009, 10:38 PM

That could be fixed with a set of 55mm offset triples from G-Craft

NCNSR · 06-06-2009, 04:18 AM

Quote:

Originally Posted by MAZZ77X

I'm sure this has been discussed somewhere before but the search came up with nothing so here it goes......

I have been reading the threads on the XR100 swaps and want to know if a horizontal CRF 50 based engine has ever been done?

Seems like a better choice with all the power combos from mild to wild and it's a lighter engine. You could easily bolt in a Chinese YX150 and have 12 HP and all the torque you need for less than $400.

Know you see why the XR100 swap is the most popular you dont need a $500.00 dollar triple.............

MAZZ77X · 06-06-2009, 05:32 AM

Aside from the cost of the triple's is it a better swap? I would think so with the engines mass lower in the chassis. Also do the of set triple's give any positive handling effects? Could be a win win if so.

Any links to these builds or video of a completed bike in action?

Thanks Anthony

firepower354 · 06-06-2009, 07:47 AM

Additional offset in the clamps will help clear, but I'd think the handling feel would suffer. The offset triples might not be enough to clear a big lump of Chi-luminum down there, either

Stock upright 5 speed trans is a pretty rugged unit, and the 80 version has nicer ratios. Shifts like a Honda...

Also, the upright mill doesn't have that much mass up high. Honda put the fuel tank under the engine and pipes above it, on a GP bike in the 80's, then realized that the bike doesn't swing over to lean at the tires, but at the CG of a bike with rider on board. Tires go out as the bike leans over. So, in the pits, it feels better, but once underway, it evens back out.

Downside is the stock head is pretty lame. There are some good ones out there for it. By the end of sumer, there will be a good flowing, low(er) cost option.

NCNSR · 06-06-2009, 11:12 AM

Quote:

Originally Posted by MAZZ77X

Aside from the cost of the triple's is it a better swap? I would think so with the engines mass lower in the chassis. Also do the of set triple's give any positive handling effects? Could be a win win if so.

Any links to these builds or video of a completed bike in action?

Thanks Anthony

Considering the preponderence of weight stays on the same plane(the crankcase is the majority of the weight of the engine) i dont think that holds water

big pete · 06-06-2009, 01:08 PM

There's someone on the board that swapped a 124SE motor in his NSR. He seems to like it. Do a search for his thread

06-05-2009, 08:18 PM	#1 (permalink)
MAZZ77X 3rd Gear Member Join Date: Oct 2006 Location: Right down the road from NJMP Posts: 2,363 My Mood:	NSR conversion ??? CRF based engine I'm sure this has been discussed somewhere before but the search came up with nothing so here it goes...... I have been reading the threads on the XR100 swaps and want to know if a horizontal CRF 50 based engine has ever been done? Seems like a better choice with all the power combos from mild to wild and it's a lighter engine. You could easily bolt in a Chinese YX150 and have 12 HP and all the torque you need for less than $400.

06-05-2009, 10:25 PM	#3 (permalink)
jsu101 PM Newbie Join Date: May 2009 Location: St Augustine FL Posts: 10	Re: NSR conversion ??? CRF based engine yes that is true and its the same thing on the ysr

06-05-2009, 10:38 PM	#4 (permalink)
big pete 2nd Gear Member Join Date: Apr 2008 Location: Norcal Posts: 866	Re: NSR conversion ??? CRF based engine That could be fixed with a set of 55mm offset triples from G-Craft

06-06-2009, 05:32 AM	#6 (permalink)
MAZZ77X 3rd Gear Member Join Date: Oct 2006 Location: Right down the road from NJMP Posts: 2,363 My Mood:	Re: NSR conversion ??? CRF based engine Aside from the cost of the triple's is it a better swap? I would think so with the engines mass lower in the chassis. Also do the of set triple's give any positive handling effects? Could be a win win if so. Any links to these builds or video of a completed bike in action? Thanks Anthony

06-06-2009, 07:47 AM	#7 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,003 My Mood:	My .02 Additional offset in the clamps will help clear, but I'd think the handling feel would suffer. The offset triples might not be enough to clear a big lump of Chi-luminum down there, either Stock upright 5 speed trans is a pretty rugged unit, and the 80 version has nicer ratios. Shifts like a Honda... Also, the upright mill doesn't have that much mass up high. Honda put the fuel tank under the engine and pipes above it, on a GP bike in the 80's, then realized that the bike doesn't swing over to lean at the tires, but at the CG of a bike with rider on board. Tires go out as the bike leans over. So, in the pits, it feels better, but once underway, it evens back out. Downside is the stock head is pretty lame. There are some good ones out there for it. By the end of sumer, there will be a good flowing, low(er) cost option. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

06-06-2009, 01:08 PM	#9 (permalink)
big pete 2nd Gear Member Join Date: Apr 2008 Location: Norcal Posts: 866	Re: NSR conversion ??? CRF based engine There's someone on the board that swapped a 124SE motor in his NSR. He seems to like it. Do a search for his thread

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