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Discussion Starter · #1 ·
Thanks for all that replied to my 'CRF230 vs. CCM C-XR230' thread -
http://www.xrv.org.uk/forums/crf-new-forum/48476-ccm-c-xr230-same-honda-crf230.html

In the end I plumped for a 2004 CRF230.

I'm loving the bike, but not finding it as powerful as I was expecting. From what I'm reading they are pretty much corked from stock and rejetting should liven it up a bit.
I've had a look at what is the encyclopedia for CRF230's at Rick Ramsey and gives a good guide to rejetting - CRF230F carb notes . The majority of reports on the 'power up' kits are from the States, where there are huge variations in temperature and altitude, therefore in theory, there should be different jet sizes depending on location.

I was wondering if anyone in the UK has rejetted their CRF230 and what jets and settings did they use?

Thanks in advance for any replies.
 

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Discussion Starter · #3 · (Edited)
k n N do a filter kit for this , part number HA-130

itll do wonders for the bike !!!
Thanks for the reply.

I was wondering if you had personal experience of a CRF230 with a K&N filter fitted?
The reason that I ask is that I read as many posts criticising K&N filters on off-road bikes as praising them.

Also did you rejet when you fitted the K&N filter?
 

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never fitted one to a 230 ,,,,, fitted em to yamaha blaster quad , and a yzf450

but always bought a needle and jet kit aswell

instant extra power !!!

the difference to the blaster along with an fmf pipe was unbelievable
 

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When I had a SL230, same basic engine, I found this site CRF230F with tuning info
 

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i have both a k&n filter and a jet up kit.
well worth the money, the jet up kit has a new needle and mainjet and was fitted in minuets realy made a difference, you need to remove the extra bit in the airfilter box, it just comes out.
had no problems at all and does pull well from nothing even in the higher gears.
 

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Discussion Starter · #7 ·
i have both a k&n filter and a jet up kit.
well worth the money, the jet up kit has a new needle and mainjet and was fitted in minuets realy made a difference
Thanks for the reply.
I don't suppose that remember where you bought the 'kit' from or which jets you actually used?

I checked mine today and is running on 102 Main Jet and 42 Pilot Jet.
CRFs only, suggest to run on 132 Main Jet and 45 Pilot Jet, which seems like a huge jump!
CRF230F - Power UP Jet Kit: CRFs Only - Your Source For Honda CRF Parts, Accessories and Information...

you need to remove the extra bit in the airfilter box, it just comes out.
Thats at the top of airfilter box, right?
Did you cover the hole with foam or anything?

My standard silencer / muffler is looking a little rusty now, do you have any experience with any after market 'power' exhausts?

Thanks.
 

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i got my jet up kit from haven trialsport in cumbria, not sure they are still there though it was back in 2005.
i did not do anything about the bigger hole in the airbox.
my silencer is still ok, but you may find one of these chaep chinese bikes ones may well do.
i would be wary of the thumper bike forums mods unless you want to race them, in california were most of these mods originate they rarely have any mud.
i bought a bbr rev box, it was worse especialy for trail riding and ldt's, ok iof you are blasting through the desert, not many of them in the southwest even without the rain!
i would also get a thin sheet of flat plastic and rput it up around the frame tube for the ign as the short front guard shoots loads of mud all over the cdi box and wires, a fidly job but well worth it, imho.
i also fitted stiffer front springs as well from cannon racecraft, an ebay special £25 inc postage, again i do not think they are there anymore.
hope this helps
shaun
 

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Discussion Starter · #9 ·
i got my jet up kit from haven trialsport in cumbria, not sure they are still there though it was back in 2005.
i did not do anything about the bigger hole in the airbox.
Thanks for the reply.
I'm struggling to find a UK supplier for after-market exhaust / silencer and all the adverts that I see for US companies state that I would be responsible for the import tax, so are going to stick to my stock muffler to the time being.

I also order the 'power-up kit' from Haven. It arrived today, essentially it was the 'power needle' (16012-KPS-921) and a #135 main jet (99101-KPS-1350) and no pilot jet! Going from a #102 to a #135 main jet sounds like a huge jump (especially without a change of pilot jet)!
I'll fit the jets along the K&N filter and report back.

Thanks.
 

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i would not bother with a power exhaust, it makes the bike far too noisy and does not realy make it better for snotty trails, most of these usa aftermarket goodies are for flat out racing which is not the bikes real use.
snotty muddy trails and trials type going is where it scores.
i want another engine for my mx frame that would make a great enduro bike.
good luck
 

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Discussion Starter · #11 ·
Thanks for the reply.
i would not bother with a power exhaust, it makes the bike far too noisy and does not realy make it better for snotty trails, most of these usa aftermarket goodies are for flat out racing which is not the bikes real use.
As my silencer was looking a little ripe in a couple ofplaces, if was a case of looking for a replacement one, rather than replacingit for the sake of it. Managed to patch it up, so that it might go on for awhile longer.

Had a go with the power up kit at the weekend. It waseasier to do than I thought for, changing the needle jet looked a right fiddlewith a couple of ‘I’ll spring off to the darkest part of the workshop’ springs,but was easy enough to fit without any specialist tools.

Fitted both the new main jet and the power up needle - nota good change – firstly the bike wouldn’t start on the electric start and wouldonly start by bumping it. When I got it started it ran like a bag of spannersand I mean a bag of spanner – coughing, spluttering, backfiring.
So decided to give it a go by going back to the stockmain jet (#102) but with the power up needle fitted – slightly better, butstill not got enough to ride and definitely not an improvement on stock. Sowent back to stock and all was fine again.

Just out of interest, I did try it as stock and then triedit as stock but with a K&N filter. The K&N filter did seem to give itjust a little more grunt. I ride up a long steep hill - probably a 1 in 10 (forthose that know what that means!), half way up, I usually have to drop a gear,but with the K&N there wasn’t the need to drop her down a cog.

So back to the jetting. As it run rough, I assuming that the change from a #102 to a #135without a change of pilot was too far, therefore a change to say #120 main jet and#45 pilot jet might be more acceptable.
Has anyone any comments on this?

The only other thing that I can see is that the power upneedle comes with a [description here]. I’m not sure if this guide is astandard one or one that needs to be changed with the needle (it needs to bechanged, the original one wasn’t one that would easier be knocked out). Somaybe running the power up needle with the original guide made it run rough?Allowing the needle to go down too far perhaps?

Any comments would be useful.
 

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Discussion Starter · #12 · (Edited)
Just to give an update and had another go at tuning thebike at the weekend. This time I used the ‘power up needle’ together with #120main jet and #45 pilot jet.

As soon as I fired her up, the difference in engine was amazing!
The change of jets made a huge difference to the midrange, with that part of the range more akin to a 2 stroke (trail bike) rather than a 4 stroke single cylinder thumper, there didn’t appear to any loss of torque in the lower end of the rev range.

The top end doesn’t feel quite right with a #120 jet in, but it is still a definitive improvement on the #102 and #135 jets. If I can be bothered, I might experiment by going up and down to a #115 and a #125.

BTW: You don’t have to use genuine Honda parts (and pay Honda part prices) as you can buy either genuine Keihin parts or use pattern parts (search ‘long hex’ jets for the main jets).

Hope this helps someone.

Gwernybwch
 

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Hey, yes its helped me!!

I just wondered if you've got any further with this - is this how the bike is now or have you refined the jetting? I've just bought a crf and i am wondering whether its worth doing as you have with a new K&N and jets and possibly drill out the baffle a bit.

Also can you reference where you've purchased your jets from please?

Thanks!!
 

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Discussion Starter · #14 ·
Hey, yes its helped me!!

I just wondered if you've got any further with this - is this how the bike is now or have you refined the jetting? I've just bought a crf and i am wondering whether its worth doing as you have with a new K&N and jets and possibly drill out the baffle a bit.

Also can you reference where you've purchased your jets from please?

Thanks!!
Glad that I could be of assistance. I've had some help on here so thought that it was only right that I gave something back to the forum.

To be honest, I forgot about the fine-tuning, the rejetted bike is sooooo much better than stock, that I have just left it as it was.

You don't need genuine Honda jets, you can use genuine Keihin or pattern 'long hex' jets; both of which are genuine. This is where I got my main and pilot from -
KEIHIN Main Jet Long Hex CR FCR PJ Motocross Enduro 125 | eBay
I couldn't find a pattern 'power up needle' so got a genuine Honda one from Haven trialsports (as I was buying a few other bits)

I'm not sure that the filter actually made a whole lot of difference.

The bike is noisy enough with the baffles in and I ride in an area where there are others enjoying the countryside, so wouldn't consider altering the silencer.

If you have any other queries, feel free to post them here.

Gwernybwch

PS: Welcome to the board!
 

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Thanks, I didn't expect an answer so quick!

Just to clarify, running the carb changes you have done, I assume I would need to improve the air flow through the air filter, or can I run the changes with the stock filter do you think? A new k&n filter is pretty pricey.

I agree about the silencer, I like the fact it's quiet and I'll leave it be.

Thanks once again and for the welcome. I am looking forward to getting out for a few rides soon!
 

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Discussion Starter · #16 ·
Just to clarify, running the carb changes you have done, I assume I would need to improve the air flow through the air filter, or can I run the changes with the stock filter do you think? A new k&n filter is pretty pricey.
I fitted the K&N filter first before jetting the bike, so don't know what different the filter and jets together make, only that the filter on it own make very little difference.

I've 'unsnorkelled' my bike i.e. removed the cap in the top of the airbox. Not really sure how much difference it really makes (obviously lets more air in.......). I only really did this as virtually every comment that I read about rejetting the CRF also said to remove the airbox cap!

Hope this helps. If you do have a go at modding your CRF, please report on your findings.

Enjoy your CRF!
 

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I fitted the K&N filter first before jetting the bike, so don't know what different the filter and jets together make, only that the filter on it own make very little difference.

I've 'unsnorkelled' my bike i.e. removed the cap in the top of the airbox. Not really sure how much difference it really makes (obviously lets more air in.......). I only really did this as virtually every comment that I read about rejetting the CRF also said to remove the airbox cap!

Hope this helps. If you do have a go at modding your CRF, please report on your findings.

Enjoy your CRF!
Hey I've got another fairly anal question!
Any idea what gearing you have - is it stock? Mine has gone up one at the front to 14 and 49 at the back. With your re-jet and whatever gearing are you able to lift the front at all? Not in any hero wheelie just to clear obstacles. Mine doesn't with stock jets and taller gearing,
Cheers
 

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Discussion Starter · #18 ·
Hey I've got another fairly anal question!
Any idea what gearing you have - is it stock? Mine has gone up one at the front to 14 and 49 at the back. With your re-jet and whatever gearing are you able to lift the front at all? Not in any hero wheelie just to clear obstacles. Mine doesn't with stock jets and taller gearing,
Cheers
I've been meaning to look at the gearing, but keep on forgetting. I assume that I have stock gearing as it is pretty low geared and doesn't take much to get up to top gear. Popping wheelie? I can get the front wheel off the ground to say get over a rut or something, but proper wheelies; no chance!
 

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That is interesting for me, as with stock gearing and carburation the bike won't pop the front to clear anything. Just for reference i had on there when i bought it 14 front, 49 rear, i think stock is 13 front and 50 rear. I need to lower mine for LDTs but the bike went well with the higher gearing and i'd recommend it if you are out riding trails.

Thanks for your reply
 

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Id plumb with a exhaust from the US hands down it still be cheep than here , ive got various systems for dirt bikes from there
inc Yosi RS3 for my Drz and RMZ ...... or get a big bore kit for it Ive got a 436 kit from Millennium Technologies in the US best
money you can spend this would only work with a pipe as well thou ..... the difference is night and day.

http://www.rickramsey.net/CRF230Fbigbore.htm
 
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