250sx output shaft and gear n big red? change gearing, ? on wheel spacers?

**conig** · 08-29-2004, 05:22 PM

I have been doing research on the differences between a honda 250sx and 250 big red.
1. front fork
2. plastics seat rack
3. gearing

I found a 250sx output shaft and gear for sale at a good price. Is this unit different then the one on my big red? I have read that the 250sx has taller gears then my big red if this is true what do I need?

I assume the rear carrier has different gears but how about the forward gear? If its no different I also found a rear carrier or pumpkin or whatever you want to call it that I could pick up as well. I would purchase both if necesary.

also anyone used a dg universal muffler? I ordered one friday to use on my big red but couldn't find any opinions on this muffler.

Has anyone used rear wheel spacers for either of these models? the set I found were I beleive dura blue in the dennis kirk catalogue and are basically like the adapters used in rock crawling trucks. they bolt on covering the stud and have new studs. they widen the rear track 5 inches total. 2.5 a side. I will not be jumping this three wheeler just want it abit more stable for riding down fire roads and light trails.

all and any help is appreciated.

**Dirtcrasher** · 08-30-2004, 02:17 PM

Originally Posted by conig

I have been doing research on the differences between a honda 250sx and 250 big red.
1. front fork
2. plastics seat rack
3. gearing

I found a 250sx output shaft and gear for sale at a good price. Is this unit different then the one on my big red? I have read that the 250sx has taller gears then my big red if this is true what do I need?

I assume the rear carrier has different gears but how about the forward gear? If its no different I also found a rear carrier or pumpkin or whatever you want to call it that I could pick up as well. I would purchase both if necesary.

also anyone used a dg universal muffler? I ordered one friday to use on my big red but couldn't find any opinions on this muffler.

Has anyone used rear wheel spacers for either of these models? the set I found were I beleive dura blue in the dennis kirk catalogue and are basically like the adapters used in rock crawling trucks. they bolt on covering the stud and have new studs. they widen the rear track 5 inches total. 2.5 a side. I will not be jumping this three wheeler just want it abit more stable for riding down fire roads and light trails.

all and any help is appreciated.

Spacers will be fine if your not a jumper.

I have the Cobra exhaust - it's loud but well worth the top end gains, people also have the supertrapp but I don't know about the DG. Anything is better than stock.

The output shaft on my ES and SX are the same as well as the gears in the tranny - believe me, I have checked them. I still have no concrete proof of different gearing in either the motor or pumpkin but people claim to have seen different ratios. I'd like to see the 2 Honda shop manuals for the SX and ES to clear this up. The SX has such low gears with barely a 50MPH top speed that I cannot see the need for even lower speeds - however lets all remember that the SX uses a 22" tire and the ES a 25" tire so that may have been what called for a different gearing. Seems to me the diff would be the place to do it just like a truck but I cannot say for sure whats up.

Enjoy your toy and rejet after that pipe gets on there.

**conig** · 08-30-2004, 04:33 PM

thanks for the reply. I am just being optomistic, I have read the sx has different gearing to compensate for the 22 inch tires. i would as well like to know this for sure. Its one of the more expensive modifications I am chasing, and I can create all the power in the world the gearing will eventually stop me. not thaty this will be a dye hard riding machine. I would just like to go to a 22inch tire without sacrificing what top end I have.

the dg is just a universal silencer so I don't think I will need to rejet for it, I may need to adjust the fuel screw, but considering the stock muffler has wholes in it it will most likely add more back pressure who knows. I'm not the best with carburated motors as this is my first experience.

thanks for the help.

I would like to here from and 250sx guys that know the gearing.

**atctim** · 08-30-2004, 07:07 PM

I too am very interested in the SX vs the ES rear gears. If the SX gears are taller, I'll go buy an SX rear-end today. But I need proof first. This would be the upgrade I so need on my Big Red. SX guys, help us out!!!

**mad_max** · 08-30-2004, 10:42 PM

I looked at partsfish awhile back and I'm pretty sure the ring & pinion part numbers/prices are the same for the ES and SX (which should mean they are the same). I have not looked into the transmission gearing.
I run 20" tires on my SX and I'd LOVE to change the gearing. Just for the hell of it I emailed Currie, Richmand Gear, Moser, anyplace I could think of that did racecars or set up rear ends... of course nobody came back with a positive response to my request for a custom ring and pinion but I figured it was worth a shot. If anybody figures out a way to install higher gears (lower numerically) let me know.

**smackkk** · 12-22-2005, 11:06 PM

The 250sx Is Identical To The Es Except The Differential Gearing Is Taller...

**Dirtcrasher** · 12-25-2005, 03:03 AM

It is still a mystery to me... I have a silver ES motor and a black SX motor in my shop and the tranny gears are the same teeth. I have seen different numbers of teeth in the gears in the clymer manual that do not match either of my trannies.... ???? What about the Honda shop manuals for the ES and the SX?? Any tranny teeth differences there??

Anyone posting that the rear ends are different please post the number of teeth on the ring and pinion if you know this to be absolutely true.

**ClayW** · 12-25-2005, 10:00 PM

The Tranny gears and the 3inch taller tires are where the difference in gearing comes from. Tires and rims play a big part. And FYI, There is a LOAD of differences in the two bikes. Many differences. The ones John mentioned to start. The frame is completely, I mean completely different. The ES has a longer bulkyer frame. ALso the swing arm mounts on the inside on the BigRed and the SX mounts on the outside. Or vise versa. These are a few of the big differences. Trust me I have owned both at the same time and torn both down pretty far. Especially the ES. Many differences. The 87 ES had even more differences. Oh yeah another diff is the rear brake assembly.

If you want your ES to be faster off the line, put smaller tires on it. That way you will look gay going fast.

**conig** · 12-25-2005, 10:21 PM

I don't think my red looks gay with smaller rear tires.

**mad_max** · 12-25-2005, 11:35 PM

Dude, you got a great looking ES. If I had one I'd do the same.

**Mondexbrute** · 12-02-2007, 05:46 PM

I love your big red conig!!!! Mine is going to be very similar to yours, I just put a big bore kit from 4 stroke teck in displacement goes from 248cc-305cc, new cobra exhaust & right now I have 25" vampires on the back with douglas 190 wheels, but those going to get changed to 26" outlaws with a douglas 190 12" wheel. Man I sure would love to see a pic of your snorkel setup! I had one setup outta some flexxy *Edited**Edited**Edited**Edited* but I dont like it ...looks getto!

**rally4x4racer** · 12-02-2007, 07:39 PM

jeswinehart or sandpuppi should be able to tell you mor about the differential differences. I have been thinking about the swap also..

85 sx and es rear brakes look the same to me, Clay. I just swapped out shoes and springs the other day... I think the similarities for the ES and SX occur if they are the same year

**SYKO** · 12-02-2007, 07:53 PM

he sold that big red a while back, I was first in line to get it, but I had to hire an attorny instead with that money, so I let it ride on down the river, but to tell you guys about it, it was NICE!! super clean!!

**conig** · 01-12-2009, 12:00 PM

Originally Posted by sykolincoln

he sold that big red a while back, I was first in line to get it, but I had to hire an attorny instead with that money, so I let it ride on down the river, but to tell you guys about it, it was NICE!! super clean!!

thanks for the comps i miss it, came across some pics at christmas in my parents pictures pile i was 5 on it brand new. lol open face helmet and the tall tube socks with the stripes at the top.

**redneck250es** · 01-12-2009, 08:10 PM

Holy old thread

Mondexbrute , how did your Red act with the big bore? Do you know if they still make them? i would love to get a little more torque out of mine for pullin

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250sx output shaft and gear n big red? change gearing, ? on wheel spacers?