2 stroke dirtbike question. need some help.?

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  • 2 stroke dirtbike question. need some help.?


Answer #1 | 21/12 2013 21:25
First, I wouldnt trust an owner to tell you he rebuilt everything, does he have all the receipts for the parts that he bought. Anyone who knows what he is doing will have kept the receipts. And who is the mechanic, someone certified to do the work, or the PO. You need to have this bike looked at by a knowledgeable person, before you lay down the cash. I have bought many bikes, and almost all had undisclosed problems that the sellers either tried to hide, or lied about.
Positive: 41 %
Answer #2 | 22/12 2013 00:23
Get a friend who knows bikes and let him ride it. See what he says. Spark plugs are not too expensive. Just replace them when you sense that it is full throttle. Stick with the regular bike engine ratio. While a 2 stroke has more power, 4 stroke bikes are easier to maintain and more reliable.
Positive: 35 %
Answer #3 | 22/12 2013 00:37
20 to one as long as you stay in righr revs you should not foul plug
Positive: 15 %
Answer #4 | 22/12 2013 01:45
I am wary of people who claim to have rebuilt engines – ask them about bearings, seals and gaskets (do a little bit of research on the exact model of bike beforehand). Fouling the plug is frequently due to rider error rather than mechanical defect if the rider keeps in the powerband then a plug will not foul (provided the carb is set correctly and the air filter is clean). 20:1 ratio is often recommended but depending on the carb settings is sometimes taken to 32:1.
Positive: 10 %
Answer #5 | 22/12 2013 07:14
My son bought a 2001 CR125 used and uses it in motocross races along with recreation riding. Ask for receipts for the top end parts and others. If the seller doesn't have them, then get a mechanic to check it out. You really don't have to worry about the plugs fouling out if you premeasure oil correctly. Without a question buy a premeasure cup to get the premeasure ratio perfect ever time! My son uses one religiously and has never had plug fouling issues with this bike. Definitely test ride bike yourself before buying. If he balks about you test riding, let him know you'll buy if everything checks out. Remember with the two stroke, your big power is at the upper end of the power band, so be careful. My son paid $1200 for his and absolutely loves it!.....of course its a Honda with reliable durable quality!!!! If this bike doesn't pan out, the two strokes were made up to 2007 and are not hard to find on Craigslist.
Positive: 10 %
Answer #6 | 22/12 2013 09:22
I have a CR125, and it rarely fouls plugs. I run 40:1 with synthetic oil. Some people run 32:1, which is ok too. If you run too rich a mixture, the power valve will get gummed up, as well as fouling plugs. 40:1 is the right mixture, but if you buy cheap oil (mistake), you'll want to run 32:1. Get a ratio rite mixing cup, and check your plug after riding it a while. It should be tan or cinnamon if the mixture & air/fuel ratio are right.
Positive: 10 %

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