85 Honda xr250r with blown top end,will 83 street 250 match?

Not sure what model the bike at junkyard was or on the year, just wondering if the rockers and cam are completely different on street bikes than they are on dirtbikes. goin to the yard tomorrow and I would hate to waste the day without asking.Please help the curious newbie. thanks

 

Use the fiche and start comparing part numbers: http://www.hondapartshouse.com/home.aspx

 

thanks big guy,i do value your opinion on a couple other matters as well concerning my xj550 spark issue,sorry I'm picking up the terminology and etiquitte of this forum stuff best I can. this is from a whole nother section,oh well.when i got my bike it had already been tweeked on to the point i didn't have a shot at figuring out the original wiring,so I am using the above diagram, but I admit I have been cutting a few corners and getting bad results, whether its related to my slack ass,salvaging and swapping everything I think might work with parts off a kawasaki550.I have been working on it for a while now and so far still cant get it to fire on the 1 and 4 cylinders. So as you can imagine I have tons of questions.
1. First off how important are the lengths of the wires to and from the ignitor box?Also some of the wires seem to be the same guage,with different tendril sizes,could that be screwing me?they do have continuity,havent checked resistance(individually
2.How about the positioning and grounding of the ignition coils? Do the coils need to be directly bolted on to frame mounts or can i wire them to a body ground with a large guage wire to a more convenient location?
3. Does the wattage of headlight affect the 1 and 4 coil,I retro fitted some random spotlight unsure of the wattage, but even without any lights hooked up i get no spark on 1 and 4. also I have not researched the wattage draw for the tail light and used some funky old auto taillight that looks cool,neglecting to wire up the brake function. No lights should help a weak spark correct?could it prevent spark? just like second opinion,aloy says do all that crap later to isolate the issue.
Any input you have other than "go buy a bunch of new parts" would be helpful and appreciated, I have a unique circumstance that i wont get into now, but my inquisitive mind seeks for somekind of variable reduction. Thanks appreciate the time taken,i have been researching independently to no avail.
goin to parts fiche now.

 

First I would check voltage to the coil. Sometimes because of corrosion or a loose wire or such you do not get enough voltage. Sounds like the coil may be bad but I would check to see if it is getting juice first. If it is you can swap the coils around to determine if it is bad.

 

All better now.thx