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Author Topic: What needs to be done to an 84 Honda CR250?  (Read 6515 times)

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Offline Kenneth S (222)

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What needs to be done to an 84 Honda CR250?
« on: January 23, 2012, 07:55:57 am »
Hi Guys,
Well it seems I have secured an 84 CR250 to ride the pre 85 class this year. My question is, what is the short list of mods or fixes that seems to make this model work best? Anyone on here with experience on this model, I'd be interested to hear what you did to make it handle well and if you tried any after market pipes.
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Kenneth S
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Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

TM BILL

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Re: What needs to be done to an 84 Honda CR250?
« Reply #1 on: January 23, 2012, 08:21:12 am »
If you want more power from it , you must be one hell of a rider  ;) they are a good all round bike and plenty quick enough .

Shane STW996 can probably tell you how to set one up for vintage racing ( i only had one in the day ) Still got a one owner 84 model in the shed  :)

Good choice of bike for pre 85  :)
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Offline Kenneth S (222)

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Re: What needs to be done to an 84 Honda CR250?
« Reply #2 on: January 23, 2012, 09:01:11 pm »
Thanks Bill, I am looking forward to getting to know this new girl's 'personality'. My all time favourite is my 79 CR250RZ but I wasn't getting enough rides. The new girl on the block will have to be good to hold it's own against the RZ. You've got a one owner of this model aye, that would be nice to have.
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Kenneth S
Go For It

Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline dkupf

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Re: What needs to be done to an 84 Honda CR250?
« Reply #3 on: January 23, 2012, 10:20:49 pm »
KJ. About all you have to do is keep a eye on the butter flies in the ATAC. They carbon up and don't close properly so you lose power ;) Darcy
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Offline John Orchard

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Re: What needs to be done to an 84 Honda CR250?
« Reply #4 on: January 24, 2012, 12:15:00 am »
On my 250RE I realized after breaking two pistons, that the exhaust ports needs a good chamfer on the top edge or the piston crown will catch on it.

An Ohlins rear shock transformed the rear suspension.

And that was 'all' she cried  :-)
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Offline Slakewell

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Re: What needs to be done to an 84 Honda CR250?
« Reply #5 on: January 24, 2012, 08:38:54 am »
I seem to remember most fast guys on these ran Pro Circuit barrels and pipes and WP rear shock , I think they also tossed the Honda exhaust chamber thingy from the barrel. 
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Offline 09.0

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Re: What needs to be done to an 84 Honda CR250?
« Reply #6 on: January 26, 2012, 08:50:13 am »
Water pump corrosion of course
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Offline motomaniac

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Re: What needs to be done to an 84 Honda CR250?
« Reply #7 on: January 26, 2012, 11:05:35 am »
Quote from: dkupf on January 23, 2012, 10:20:49 pm
KJ. About all you have to do is keep a eye on the butter flies in the ATAC. They carbon up and don't close properly so you lose power ;) Darcy

The 85 's had the butterfly valves ,the 84 has a plunger.
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Offline motomaniac

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Re: What needs to be done to an 84 Honda CR250?
« Reply #8 on: January 26, 2012, 11:07:10 am »
Quote from: Slakewell on January 24, 2012, 08:38:54 am
I seem to remember most fast guys on these ran Pro Circuit barrels and pipes and WP rear shock , I think they also tossed the Honda exhaust chamber thingy from the barrel. 

You're thinking of the ProCircuit 125's Slak, when they had the atac inbetween the cylinder and the pipe ,the 84 250 atac is on the side of the cylinder.The 85 250's had the 125 style atac which you remove and replace with a supplied flange if you use a DG pipe (which is thier 86 pipe) but its not a good idea
« Last Edit: January 26, 2012, 11:11:52 am by motomaniac »
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Offline Boyracer

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Re: What needs to be done to an 84 Honda CR250?
« Reply #9 on: February 01, 2012, 05:31:14 pm »
Some jetting specs would be good, mine has a DG pipe and on the last OS, should fly.
I tried to fit a PWK38 flat slide but gave up, the standard carby should do the job though.
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Offline Kenneth S (222)

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Re: What needs to be done to an 84 Honda CR250?
« Reply #10 on: February 12, 2012, 06:48:25 am »
Thanks guys, she comes this week. Can't wait to go through it and ride it!
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Kenneth S
Go For It

Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline Kenneth S (222)

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Re: What needs to be done to an 84 Honda CR250?
« Reply #11 on: February 25, 2012, 06:15:53 am »
Well, I received my 250 and have been reminded again of the cowboy butchers out there who own bikes and don't deserve the privilege. What a mess! Maybe it's me the problem, I expect it to be normal to use matching bolts(that have been tightened and haven't been rounded off or painted), washers, lock-tight nuts, the correct part for that model bike etc. Who puts in a new piston and leaves in the old warn out rings, bearing and pin?! I also expect dirt bike owners to have more in their tool box than a shifter and a hammer! ???

Anyway, with a few hours of TLC, I'll get her race ready.

The radiators on this are not the correct ones for this model. Has anyone had any experience with either of these or do you know of a better option?

http://www.ebay.com.au/itm/250921891029?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_1935wt_1185

http://www.ebay.com.au/itm/290674972751?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_2014wt_952

Also the water pump is cracked but there are none to be found on eBay at the moment. Anyone have one or know where I can get one?
« Last Edit: February 25, 2012, 06:20:21 am by KJ222 »
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Kenneth S
Go For It

Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline VMX Andrew

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Re: What needs to be done to an 84 Honda CR250?
« Reply #12 on: February 25, 2012, 08:15:36 am »
Bloody hell Ken sounds like you have a big job on your hands there gettin that one
up to race ready spec, hope it all works out for you because Lake glenbawn is only a few weeks away. :o
Dont worry this sort of stuff happens all the time when you buy new-secondhand  (race ready bikes) im goin
through the same sort of scenario with 2 of mine at the moment, the yamaha and the 89 500 ...
The yamaha was claimed to be race ready but only lasted one race then the crank went south :'(
and the 500 had a few missing parts namely radiator protectors and air filter plus the fly wheel cover had a
hole in it ...   
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mainline

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Re: What needs to be done to an 84 Honda CR250?
« Reply #13 on: February 25, 2012, 08:25:59 am »
Quote from: Andrew vmx on February 25, 2012, 08:15:36 am
Bloody hell Ken sounds like you have a big job on your hands there gettin that one
up to race ready spec, hope it all works out for you because Lake glenbawn is only a few weeks away. :o
Dont worry this sort of stuff happens all the time when you buy new-secondhand  (race ready bikes) im goin
through the same sort of scenario with 2 of mine at the moment, the yamaha and the 89 500 ...
The yamaha was claimed to be race ready but only lasted one race then the crank went south :'(
and the 500 had a few missing parts namely radiator protectors and air filter plus the fly wheel cover had a
hole in it ...   

That's pretty shitty to hear, if someone says a bike is 'race ready' I'd expect everything to have been rebuilt in the last couple of years, not just a new top end.

As for the CR250, was it a sight unseen ebay purchase?
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Offline Ando

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Re: What needs to be done to an 84 Honda CR250?
« Reply #14 on: February 26, 2012, 08:43:01 am »
Hi KJ, that doesn't sound like good news to me mate? Do you think it will be ready? Don't worry mate, I just got back with a YZ250L, which is a bucket of bolts too mate!!

 
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