Author Topic: cr80/xr80 hybrid?  (Read 8469 times)

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mainline

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cr80/xr80 hybrid?
« on: December 23, 2014, 03:51:19 pm »
Has anyone ever looked into grafting an xr80/100 motor into a later model cr80 (or similar) frame? I was thinking of something with good suspension and brakes but more user (and neighbour) friendly than the 2 stroke.

Offline Momus

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Re: cr80/xr80 hybrid?
« Reply #1 on: December 23, 2014, 04:24:41 pm »
It's a very popular conversion with the XR100 motor being the usual choice.

 file:///C:/Users/Marcus/Desktop/SoCal%20XR's%20Newsletter.htm

I have a nearly completed XR100/Takegawa145 in an SX85 KTM chassis.
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Offline luigi37

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Re: cr80/xr80 hybrid?
« Reply #2 on: December 23, 2014, 04:52:55 pm »
http://www.socalxrs.com/

have a look at these , good for XR and TTR125 etc any aircooled hot rod mini.
RH250 TM125 RM125B RM125C RM125T RM125X RM250B RM250C2 RM250X RM250N RM370A RM400C RM400N RM400T PE175D YZ250A XR75 x2 XR80 TTR125 CRF250X BLASTER S2R yz80d yx600

Offline Nathan S

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Re: cr80/xr80 hybrid?
« Reply #3 on: December 23, 2014, 07:43:06 pm »
Did you see any of the "Backyard SX" articles in US Dirtbike? Not overly detailed tech articles, but enough to show that it's been done more than once before.

The good thing about telling the truth is that you don't have to remember what you said.

Offline Tim754

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Re: cr80/xr80 hybrid?
« Reply #4 on: December 24, 2014, 06:10:52 pm »
That conversion used to be a class in minibike racing in Victoria. (Old Victorian Junior Motorcycle Association ( ? )prior to amalgamation with MA. )
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Offline Momus

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Re: cr80/xr80 hybrid?
« Reply #5 on: December 25, 2014, 05:21:04 am »
Langtown in SoCal.
Once the holy grail of backyard Supercross;
150 cc 4 stroke, any chassis.

https://www.youtube.com/watch?v=v6Qnw5LK3Lo

Now, after being noised out, the track is used for a novelty race for mountain bikes.
If you love it, lube it.

Offline tony27

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Re: cr80/xr80 hybrid?
« Reply #6 on: December 25, 2014, 08:26:17 am »

Offline Doc

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Re: cr80/xr80 hybrid?
« Reply #7 on: December 25, 2014, 09:47:22 am »


not a CR chassis but...

Offline evo550

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Re: cr80/xr80 hybrid?
« Reply #8 on: December 25, 2014, 10:02:10 am »
Wouldn't  it be easier to graft better suspension onto the xr chassis?

mainline

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Re: cr80/xr80 hybrid?
« Reply #9 on: December 25, 2014, 10:20:56 am »
Wouldn't  it be easier to graft better suspension onto the xr chassis?

I think i'd rather have this


Offline Momus

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Re: cr80/xr80 hybrid?
« Reply #10 on: December 25, 2014, 01:12:09 pm »
Wouldn't  it be easier to graft better suspension onto the xr chassis?

XR frames are weak when jumped; no under engine tubes and the backbone bends.

The rear shock is very short and limits travel to about 6". CR85's run about 11" at rear.
If you love it, lube it.

Offline evo550

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Re: cr80/xr80 hybrid?
« Reply #11 on: December 26, 2014, 02:33:14 pm »
Wouldn't  it be easier to graft better suspension onto the xr chassis?

XR frames are weak when jumped; no under engine tubes and the backbone bends.

The rear shock is very short and limits travel to about 6". CR85's run about 11" at rear.

Works do a shock for them that gives then proper action and a couple of inches extra travel, that combined with mid '80's cr 80 front end would be a good little combo.
It's never going to be able to do 120 ft tabletops as they simply don't have the juice. They usually struggle to get up the up ramp.
They are great bike for what they are designed for, but Mx isn't it.

Offline FourstrokeForever

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Re: cr80/xr80 hybrid?
« Reply #12 on: December 27, 2014, 10:40:11 am »
Here's my XR/CR80 Hybrid. Built more for show than go. I can't see myself ever wanting to race around on an XR anymore. I have bigger toys now  ;D




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mainline

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Re: cr80/xr80 hybrid?
« Reply #13 on: December 27, 2014, 12:27:28 pm »
Here's my XR/CR80 Hybrid. Built more for show than go. I can't see myself ever wanting to race around on an XR anymore. I have bigger toys now  ;D






That is a beautiful bike. I wasn't thinking of a bike for me to ride though. I was looking for something for my son. There seems to be a big difference between "kids" bikes and race minis these days that i don't think was the case in the 70's and early 80's.  Something with a quiet user friendly engine but a good frame and suspension just isn't available off the showroom floor.

Offline FourstrokeForever

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Re: cr80/xr80 hybrid?
« Reply #14 on: December 28, 2014, 09:14:14 am »
Thanks. I like how the bike turned out.
There's nothing wrong with the Honda CRF range. Sure, they don't have "race spec" suspension but they meet the demands of a semi serious play bike. I have a CRF230 that I got for the better half and it's a really fun bike to ride. I gave it a bit more oomph with stiffer springs front and back, opened up the airbox and put a twin air filter on. Full BBR exhaust with the optional Honda carby needle and jetting. Goes pretty good for an air cooled baby 4 stroke. It hardly ever gets ridden though so I am thinking about selling it.
Arrogance.....A way of life for the those that having nothing further to learn.