85R Top End Rebuild and Upgrades

[onformula1]

Yeah it seems that a lot of people go with vforce, and coming with that torque spacer lets me kinda "play around" with how it will react and run with this ported cylinder. I'm leaning more towards the vforce as well but I'll give it a day here to see if anyone has any reasoning why to choose boyesen over vforce. Not much luck finding mossbarger

Here is there website-

http://mossbargerracing.com/

I have been using them since 1983.

[250rmanfmf]

38mm and 39mm keihin are basically the same price, probably be better in the long run to go with the 39? From reading around it seems more people go with the 39. Will using the stock air box (not drilled) and uni filter restrict too much airflow to this carb? Is an airbox delete needed?

They are basically the same carb. You can bore 38mm carbs to about 39.5mm. Same thing with 39mm carbs, you can bore them to 40-40.5mm. 38mm is probably the best unless you plan on running a big bore. The larger carb you have you will loose bottemend power if the carb is too large for the motor. 38's are the perfect size for overall performance for 250-295cc 250r motors from what I have seen, IMO.

[250rmanfmf]

What are you running for an exhaust system? You wont get full potential out of the intake mods (larger carb, v-force reeds, ported cylinder) if you don't have a good exhaust system

[Samjp22]

Fmf expansion chamber and dg silencer and thanks for the tip on carbs, once we find out how this cylinder will react I'll go from there on size

[Samjp22]

Well thanks to MTS got everything ordered and at the shop for this to finally get done! New throttle cable, 39mm PWK ordered, bunch of jets, cylinder dropped off at Honda and found out this cylinder should run good! should be back together in a couple weeks, in the mean time ill make a leak down tester

Went with the 39mm because MTS and I think it'll be just fine for this set up and this will most likely just keep getting a bigger and bigger bore as the years go on lol

[Samjp22]

Got the cylinder all bolted up and double checked my ring gap before putting it together. Almost had to split the bottom end..... while putting a cir clip on the piston it went ping and made its way past my rags and into the crank housing. I was about ready to start unbolting the motor when I got a glimpse of the cir clip in the bottom end. Made it a mission to get it out. I had a little screwdriver with a magnet on the end of it that was just a little to big to fit down into the crank housing. Took a file to the handle and made it fit. I was able to get the magnet to grab the cir clip and rotated it to the front of the housing, however it still wasn't coming out. Then I went and grabbed some long dental/surgical pliers that can grab and lock onto stuff. I was able to fit these down there and just grab the cir clip. With some fancy manoeuvres I was able to pull it out. THANK GOD!

Anyways, reeds will be here early next week so in the meantime ill make a leak down tester, definitely don't want this blowing up as soon as it fires up. Also have a water temp meter on it's way to splice in. Hopefully she'll be running soon.

[El Camexican]

That would have sucked I'd flip the trike over, or pull the engine and shake before I'd split the cases on a 2 stroke for a clip. Next time (God forbid and there's not room for a magnet) you can try takin a piece of thin wire, like say a coat hanger and put a reverse wrap of duct tape on it, then slide it down and pick it up like that.

Did you install the open ends of the clips either straight up or straight down?

[Samjp22]

yeah never thought of the duct tape one!

Installed the clip openings facing up

[Samjp22]

Well making a 20$ leak down tester was well worth it. Just had to clean up my reed cage opening on the cylinder a bit. used an expandable plug for the exhaust then just some pipe/fittings for the rest of it.

Decided to put the stock carb on cause I was just itching to start it! Fired right up after a few kicks. No leaks and everything seems to be good. Gonna put around on it for a bit tomorrow to start breaking it in and the sound of a ported and polished cylinder is so much nicer than stock! A lot more snappy sounding than stock

[Samjp22]

Well took her out on the lake today. She's running nice and rich for this break in period on the stock carb. Once the new carb is in and the motor is nicely broken in I'll get that set up. Just wanna say thanks to everyone who's helped me along in this rebuild, learned a lot! Ride on

[Samjp22]

And my pictures sideways, don't know why it always does that lol