MC_D250RTB Mods

Well Hi All i an new to this forum. But would like to share the mods I have done to my bobber. There is alot I have done since I got the bike. Like alot of you I had trouble right out of the box. Flat tire. had to put a tube in front wheel spooks were leaking.carb had to be replaced, it was clogged and I could not clean it out. Ok the mods are as follows. Removed all turn signals and controls on handle bars. Put a set of drag bars on. mounted headlight switch in headlight bucket. Installed 12 volt sealbeam in place of the chineese bulb. Mounted a 72 sportster tank. Removed ignition switch and mounted a toggle switch by the seat. Starter button is on left side of bike by the seat Attachment 7978Attachment 7979Attachment 7980Attachment 7981Attachment 7982

I like where this is going. Well done, that man!

/M

votage regulator and turn signal relay from http://www.scooterparts4less.com/


Found replacement rear sprocket studs.

http://www.mychinamoto.com/forums/at...6&d=1341715023

Honda Part number 90128-382-670 made in Japan.
Source - Ebay

bent your shift rod ? http://www.gravesport.com/Graves-Mot...Shift-Rod.html

horn bracket as well as a reflector bracket broke for seemingly no reason (rewelded reflector , replaced horn with 1 from Oreilies autoparts (car horn))

sprocket - http://www.oldbikebarn.com/Motorcycl...?search=JTR279 - 520 chain - most seem to go for 36 tooth 38 if your heavy or riding in really hilly conditions , myself (175 lbs) I use a 428 chain 17/36 (17 front wont fit with 520 chain) (15/30 16/33 520 equivalant) (80+ mph indicated perfect conditions) but you MUST HAVE jetting and air ram and keep valve adjustments very close and keep flapping clothing (drag) to a minimum or you will never see the top of 5th
- and remember max horsepower (between 10-15) is produced @ 2/3rds max RPM's unlike overhead cam motors and then it drops off SHARPLY , gear accordingly , you need not reach max rpm's in 5th if you can hold your desired cruise speed at 1/2-2/3 rpm's , which also increases fuel economy and manages heat better

air injector delete

dimming headlight problem, really easy to unplug the blue and white wire from the dark green wire and plug it into the other blue and white wire like it should have been been in the first place. now my light switch works and my lights don't dim

upjet http://www.mychinamoto.com/forums/sh...ll=1#post41593

magnetic drain plug - http://www.oldbikebarn.com/BikeMaste...AG-12MM-ALU-BM

LED tail light ( buy and install new socket/bulb )

I went to auto parts store and bought a radiator hose (used the air filter for sizing) with a 180 degree bend in it cut it to only have the U shape bolted it to the carb the other end to the air filter , now I have a forward facing air intake out in the air stream - aka poormans air ram ( no real effect untill past 50 indicated )

new battery (have to chop into steel battery box to get new 1 to fit) from autozone

HAVE A HUGE PROBLEM!!!!!!
Filled up the tank and started. Holy s--t full RPM, couldn't get to the kill switch fast enough.
pulled the needle seat didnt ya :P
wide open throttle is caused by re-inserting the carb tube (with needle in it) so dont seat fully . I did that myself
look at it the cutout has to be facing the rear wheel , and it will let it seat deeper , stopping that WOT on start

valve adjust - https://docs.google.com/viewer?a=v&p...wZDM3&hl=en_US = compression stroke = both valves fully raised

chain roller - http://www.ebay.com/itm/ATV-CHAIN-RO...009836&vxp=mtr

55/65 watt sealed beam headlight that fits - its a , Sylvania H5006 , and the Wiring harness to go with it , fit inside the existing headlamp shell

all right I believe thats everything fairly relivant to the DF's for the most part (just thought I would mash all upgrade repairs together into 1 compact area) - most are from what others have found im just jamming em into 1 post

Hey:thumbsup:Thanks for the info and the links to the web sites. Sure will be a help.What is the number of teeth on the stock front and rear sprocket.? I want to up the top end speed.

Do you have a link for the seat?

:thumbsup: Here is the link http://www.bikersaddles.com/ He has some really cool seats and other stuff at a great price.

stock I believe was 15 / 42

if you change chains to a 428 you could go as low as 17 35 , and be shifting into 5th @ 70 (indicated) , but only recomended for flatlanders and those under 175lbs

:scooter: Think I will order the 38 tooth rear sprocket, being I weigh around 190lbs. I think that might give me the crusing speed of 60 t0 65 in fifth gear without pushing the motor to hard. I will try to post some more pics showing the whole bike. Still got to paint the gas tank yet its just flat black.

:scooter: well here are the pics of the bike with mods done and painted. Its not finished by no means I still want to do more to it, Attachment 8046Attachment 8047Attachment 8048Attachment 8049

saludos from mexicoAttachment 8095

Today I swapped out the jets for a #42 pilot (slow) jet and a #120 main. I left the needle as factory set and did not re-adjust the idle mixture screw.

Immediately I noticed that a) I now only need 1/2 choke to start the bike cold, b) the popping on deceleration is almost all gone and c) the bike pulls noticeably harder. The Keihin #42 pilot jet I used is a one-piece design as opposed to the 3-piece design that came as stock. I also swapped the float bowl Phillips screws for SS socketheads.


I noticed in the floatbowl that the accelerator pump has its own jet above a spring loaded check valve. There may be tuning capabilities there too.

I have not -yet- played around with the accelerator pump timing, needle clip setting and/or the idle mix screws. I need to get some more seat time with the current set-up. At very least, I think that the #42 jet made a world of difference.

Since I get the jets from the same source as I do for my Triumph business, it would be a no-brainer for me to put together a re-jet kit with instructions and screws. Whatcha-all think? Should I get into the DF parts business?

/M

Ooops, posted twice.

:scooter: Well I orderd the 38 tooth sprocket last week but they were out of stock. So I went for the 35 tooth sprocket. I installed it on sunday with no problems, took it out out for a test ride man what a difference, I can now cruise down the highway at 55 to 60 without the motor sounding like its going to explode. RPMs have droped down to a comfortable level.

Choctaw I'd like more info on the starter button reroute. Bike is coming out great.

:confused1: Sorry all I have been so busy this winter that I neglected my bike and my posting. Still working on bike \. Carb mods I tried didn't work out. Jets didn't help!! Had to change the CDI out because it would not run right, seems mine went bad. Runs better now but still think carb is a piece of junk, going to try another carb, not sure what yet.