1982 ATC 250R MANUAL
1982 ATC 250R PRO
1982 ATC 250R TRIAL

The three-wheeler was bought new at Taylor Honda in Woodburn, Oregon, and reportedly sat in a collection for two decades prior to the selling dealer’s acquisition in December 2020. Features include an air-adjustable fork, a monoshock with a remote reservoir, a front disc brake, 22″ knobby tires, and a kickstarter.

1982 ATC 250R MANUAL

Last edited by 82 250r 12-25-2013 at 02:13 AM.This 1981 Honda ATC 250R is a first-year example that is powered by a 248cc two-stroke single mated to a five-speed manual transmission and finished in red with gold wheels. Advanced timing also can make a motor run lean so check your jetting often. If you choose to advance your timing, go small (1-2 degrees) and watch for detonation. In fact, it may help to retard the timing especially if the port timing has been changed or you have an aftermarket CDI with a high rev limiter. Those with high rev motors need to be very careful advancing the timing. So far i have advanced it 4 degrees and can probably go another 2-3 before I'm done tuning.

1982 ATC 250R TRIAL

Obviously i can use some timing with this combo.but how much? The answer is really trial and error. We have to tune our motors based on the combination of parts, how it was built, and for the intended use.įor example, my cylinder is ported for low end trails, has a low/mid pipe, stock silencer, stock gears/tires, to be ridden at 5000'-10,000' elevation, with 110 octane. I believe a stock motor, using pump gas at sea level, can benefit from advanced timing although i have not done it myself. The solution? They tune them for the lowest common denominator. There is no way Honda can tune all their products for all areas of the world, in all riding conditions, for all riding styles, with different blends of fuel etc.etc.

1982 ATC 250R PRO

This is because, even though a non pro might be able to feel the difference when it is done on a modified bike, imo it is not worth the additional risk in detonation it causes.ĭo you guys with the ability to make adjustments advance or retard your timing? How many degrees till you start to see a difference?įrom what i understand the 250r left the factory de-tuned by 4 degrees. This is another reason some bikes that are built for high performance and on the threshold of detonation, occasionally blow up for no apparent reason.Īdvancing the timing 4 degrees is not something I would recommend for any non pro or non rich rider. This means that just because you buy Shell one day that had a true 91 octane rating, there is no guarantee that the next time you buy it or gas from Union 76, that the octane will be as high even though it says right there on the pump that it is. The exception to this is E85 corn gas which has a detonation resistance equivalent to around 100 octane regular gas but it has less energy than a comparable regular gas.Īt least some 'production” gas has a very inconsistent octane rating. If you run increased timing AND increased compression like some do, you will positively need to run fuel with an octane rating of more than 91. If you increase your compression from stock you will likely need to run more than 91 octane. If you advance the timing you might have to increase your fuel octane. If you advance the timing you will likely need to increase your main jet size by 1 and raise the needle position by 1 if your bike is currently perfectly jetted which most are not. If the stock muffler is removed, increasing the timing 2 degrees will have a more noticeable effect than increasing it with a stock one, however you must increase the jetting size if the stock muffler is removed whether the timing is increased or not. It can be tricky business and can cost you a perfectly good top end if you don't get it right.Ī completely stock 250r is on the threshold of detonation with 91 octane in hot temps when ridden hard, therefore, increasing the timing will push it over the edge under these conditions which as ride-red 250r mentioned, may cause 'issues' which are mainly piston related. But one thing I can tell you is, BE CAREFUL and know what you are doing when playing with your timing! I have not yet run adjustable timing on either of my R's to this point, but have seen where others sometimes have issues.

1982 atc 250r