Posts
806
Joined
4/15/2009
Location
Phoenix, AZ
US
Edited Date/Time
1/23/2012 9:11am
Have a friend who's been on the fence about getting back into riding. After watching us ride at the track he finally decided to take the plunge and get a bike. I've had this 99'cr250r in my garage collecting dust and offered to sell it to him. He bougth it and has been wrenching in it, testing riding but it isn't getting into the power band.
He ended up bringint it to a friend of a friend mechanic and came to the conclusoin the CDI box is shot. Being as old as the bike he's having problems locating one through the local/internet parts stores. My friend finally located one on ebay and told the mechanic guy. Apperently the mechanic is hesitant about doing it because he said purchasing a used box is illegal. I've never heard of this, so I ask you guys, is this true?
He ended up bringint it to a friend of a friend mechanic and came to the conclusoin the CDI box is shot. Being as old as the bike he's having problems locating one through the local/internet parts stores. My friend finally located one on ebay and told the mechanic guy. Apperently the mechanic is hesitant about doing it because he said purchasing a used box is illegal. I've never heard of this, so I ask you guys, is this true?
The Shop
Never had a CDI box go bad, not saying it isn't possible, but not likely..
if it was me, in this order, I would trouble shoot.....
check oil level. if its too high the bike wont rev (drag from the oil) but will run at lower rpms (i know, dumb, but have seen this happen alot!)
take the air filter out and replace (unless you already have-have seen an old filter that looked clean not flow much air)
take the carb off, the jets out, soak it in acetone for 30 mins, then blow it out with air comp, and use some scotch brite to lightly buff the jets.
Put in a new plug, the right one! (unless you have already)
most important one though, take the power valve cover off. If memory serves, you had to have them adjusted right or the bike wouldnt run above idle. There should be 2 marks, motor off, and one for fully open. You made sure it was right at the lower mark motor off, then you fired it up, warmed it up, and cranked it wide open to see where you needed to adjust it too in WFO conditions. Also, before you start it, manually move the linkage, it should be free.
if after all this it wont rev (when you cranked it wide open and it wasnt revving and you manually moved the powervalve linkage and it still didnt rev) then I would look at the wires to the CDI first, pack rat anyone? And if those appear intact, then CDI it.
now, sarcasm alert!!!!
wait.... whats this?!?!?!!?
its a 2 stroke and it has to goto a mechanic?!@??$#Q@!!!
I thought noone EVER had to take a 2 stroke to a mechanic to get it worked on because 2 strokes were such an easy bike to work on!! be careful in this thread, and with it... the rabid delusional masses will come in here and somehow blame this on 4 strokes and some grand master plan by honda. You have the proof! its illegal to buy a used part for a honda 2 stroke!
For what it's worth, the mechanic is legit as far as knowledge. Currently wrench's at a local shop, and is well regarded with the vets around town. He's not in it for the money, just trying to help my friend get hooked on the moto drug.
Besides not being fired up and sitting in my garage the bike was in pretty good shape. My friend not being too mechanically inclined seemed to go through the proper stages of starting it after its long hiatus. In fact he said it fired on the fourth kick. Went out to the desert and test rode it. Allways kicks over fine, idles fine and cruises along fine, just won't pop into the power band. Shortly before I went to the dark side and put the smoker to rest, I had the top end done a new set of reeds installed, and soaked the carb. Come to think of it, the power valve is the only part I didn't touch.
Well thanks for the advise, see if we can't get bike back on the track.
step two.....try a different color power band.
I mean, I thought the power band was, aside from a 6 gauge rubber band, the entire spread of power from bottom to top?
I must be thinking about the blue one.... I bet he is talking about the red one.
I joke I joke.
I had to replace on in a '95 RM250--I bought the replacement new, but, there was no paperwork or special programming associated with it. Just plug it in and go.
Pit Row
Bike starts and idles fine and low RPM is ok. As soon as he raps it out hard under load the bike falls on it’s face.
I haven’t ridden it (or worked on it) so I’m going by what he tells me. The previous owner said this is what happened way back when so he took it to a local guy who installed a new top end and it did not cure the problem. So from what I have gathered this should eliminate the powervalve being installed wrong as well as the top end as it happened BEFORE ever being worked on.
I feel bad for the guy as I got him the new CDI box with my discount at the shop. Now I have to try to take it back, I’m crossing my fingers, but they treat me good there so I’m hoping so. That is why it’s important to try to shop at the local dealers.
Anyway any guess’s could it be a bad coil, would it run at all with a bad coil?
Thanks
Edited: Just saw how you bought the CDI. Grrr. The power valve is stuck, even replacing a top end, and not cleaning it makes sense. Replacing a top end, does not mean you have to touch the powervalve. If it is stuck and you don't touch it, it will still be stuck.
Mine would reve if you got it going but the low speed coil was pooched. Had problems at low RPM. Have fun.
is properly grounded to the frame.
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