[AUKwrestle250]

Hey guys. Although I've had my 250R for a bit over a month, I'm still getting to know my way around the bike. I am still a little hesitant to dive into the valves and everything else. There is a local company called Moto Jockey that performs high level mods for dirt bikes. They advertise this in their "specials" part on their web site.

"Four stroke Head Work: SerdiValve job. Cylinder Head is disassembled, soda blasted for cleaning, valveguides inspected for wear, valve seats re-faced using a multi-angle cutter, springs checked for correct tension, cylinder head re-assembled using new valve seals. Valves will be adjusted if cams and related components are supplied. All machine work is done on a SERDI 3.0 Largevalve seat machine. Parts are not included in the following prices: 2 valves per cylinder $75, 4 valves per cylinder $125, 5 valves per cylinder $145. We also service and re-valve suspension using Factory Connection, Pro Action, RG3 or Race Tech."

I'm really short and am pretty light so I'm going to have the suspension re-valved. Is any of this other stuff worth doing? Are the prices reasonable? My dad would rather pay a bit of extra money to have a $6,000 bike properly maintained by professionals than risk messing something up. Thanks.

[Reallysorry0690]

looks pretty fair to me. def a good idea to get it done right. one mistake leads to another which leads to money. good luck

[AUKwrestle250]

Thanks! Even though this board doesn't have as many members as some of the other boards, everyone seems receptive. Thanks again.

[Reallysorry0690]

anytime. yeah alot of the people on this board know there CRF's. i would def come here with questions for your honda.

[124]

Is there any particular reason that you are rebuilding the head? Is the bike not running right? Won't start?

Sounds like the service is legit. But I would recomend stainless valvetrain parts and not OE stuff.

[vetteguy]

Although I have never had any work done at Moto-Jockey I have bought parts from them many times and had great service. One time something was back ordered and I got a call from Jeff, I think he is the owner, and he apoligized and said they would send the rest of my order right away. When is the last time that ever happened? Based on my experience I would not hesitate to have work done there. Good luck, Guy

[AUKwrestle250]

Thanks everyone! Everyone seems really cool and helpful there. It's not one of those big name, commercialized dealers or anything. The people there know what they have in stock, when they can realistically have out of stock items in, and they seem really willing to help people who don't know exactly what they're doing out. 124, I am not planning on re-building the head for my 250. I am, however, thinking of taking the bike in to get its valves adjusted for a first time. Some of the mechanics there said that they'd help show me how to get around the bike if I had any questions. They have done some really good suspension work for a lot of local racers around the DE/PA area and I was going to get mine re-valved to better suit my weight.

What exactly could having some of the procedures that were described in that moto jockey paragraph for the performance of a stock 250? - I'm ready to start adding some aftermarket parks to the beast to help make it a little more performance oriented. Besides the suspension, what could I get done professionally to help with the bike's performance without having to send the motor away to some big company? Any thoughts?

[djh65]

If you have lots of money to blow go for it. If not do the air box mods, the bafflectomy or removal and the jd jet kit. You will be amazed at the difference for only $75.
David

[AUKwrestle250]

David - I'm defanitely not going to go blow a bunch of money on high performance (high cost!) engine modifications and reconstruction. However, in the near future, I am planning on purchasing the JD Jetting Kit and the Twin Air Powerflow kit.

What exactly are the procedures that you referred to for the airbox modifications? Baffle? I found an airbox link on the 450X in another portion of the forum but didn't find anything about the 250R.

Thanks. Sorry for so many questions..

Jon

[124]

These guys can point you in the right direction for the airbox mods and jetting pointers. Do these and maybe a full exhaust system, and you won't be worrying about enigne modifications anytime soon. It'll scream.

The valve clearance adjustment can be done yourself. It's easy. The valve clearance check is even easier and you'll be happy you did it yourself. The only thing that Moto-Jockey can help you with is the shims. If you don't have a shim kit (a kit with all the various shim sizes), then you'll have to purchase the correct size shims when adjustment is needed.

There are tutorials on how to do the check and how to do the adjustment here on CRF's. Clean everything real good, take your time, and you'll be very pleased you didn't pay someone to do it when your done. After the first time, you'll be able to do it with your eyes closed...

[AUKwrestle250]

Thanks 124. I do need a shim kit to do the valves myself. I guess I'm a little too afraid that I'm going mess something up with the bike. But once I get a shim kit, I'll give it a shot and see what happens! Are there any other tools worth getting (perhaps not necessary) that would make adjusting the valves easier? Thanks again!

[Mikey350D]

My local shop is very good so I just buy the individual shims I need.
You will have to remove original shims to find out what size they are (may have to mic them if numbers are worn off.
Checking valves is easy... Just take your time, follow the manaul, take pictures, mark every thing (cam etc)....

Unless your skill level is Int or Pro there is no sense in spending $$$ on head mods.
We wear out a head in 6 momths: We just buy new head and valves: Cheapest and most reliable.

[124]

Thanks 124. I do need a shim kit to do the valves myself. I guess I'm a little too afraid that I'm going mess something up with the bike. But once I get a shim kit, I'll give it a shot and see what happens! Are there any other tools worth getting (perhaps not necessary) that would make adjusting the valves easier? Thanks again!

Just the feeler gauges. The more blades, the better. Make sure the smaller ones are below .005", preferably down to .0025.

[djh65]

The how to articles are all on the home page. Air box is pretty much the same. I forgot you have the R so no baffle to ectomy. You can change to the billet tip on the stock exhaust, and there is a how to on that also. As far as valves go, the checking is really easy, like mentioned above just get a good set of feeler gauges I think the bent ones would be better than the flat ones. I figure I'm going to to the checking on my own then when it comes time to adjust my local shop will do it for $140. Unless I am broke then I'll do it myself. Have fun on the bike.
David