85R Top End Rebuild and Upgrades

[Samjp22]

Went and talked with the mechanic at the honda dealership today and he was also saying I should be covering my radiators some.. the thing I don't understand is if it were to cover them wouldn't that cause it to run hotter? The trike overheated (I don't think from the cold, probably from being wide open for about half hour cause if I got out of the power band I would've been stuck) and thats what I think lead to the failure. If they were covered wouldn't it overheat even quicker? And the mechanic is going to bore it to wiesco specs once the piston arrives.

[Samjp22]

Do you guys also think I should replace the small connecting rob bearing at the top where the wrist pin goes through?

[RoscoW]

Yes I would replace it.

[Samjp22]

any special tricks to getting it out? Or just support the con rod and tap it out with a socket?

[3wheelrider]

It slides out with no effort....

[MTS]

Get a temp guage on it, the cardbord on the rads is for more high speed riding in cold weather to retain engine heat. Did you notice your overflow tube spitting antifreez out? I think ya just riped on it too hard too long with too tight of piston/ wall clearence...once you got off the throttle it lost enough inertia to stick it...lucky for you it didnt stick at wot. And the pin bearing should pop right out , check the bearing surface in the rod for any pitting or bad scoring also.

[Samjp22]

Thanks for all the help guys appreciate it as this is my first two stroke and first time going into a two stroke motor.
atc300r- I run BelRay H1-R synthetic oil at 40:1. (recommended to me by Honda dealership) I find i get great power and color on the plug with this.
MTS- Where would one get a temp gauge and install it? I did some looking around on ebay and was unsuccessful. As for coolant it was coming out the rad cap, spitting out the overflow tube, filled up my overflow bottle, bubbled out my overflow cap and came out my overflow bottle tube LOL basically everywhere it could.

[MTS]

I got a little trail tech deal with a lcd display i mounted on my bars at a local 4x4 shop, buuut im guessing the next time you see your overflow puking its guts out you will stop ..* cough* *cough*

[Samjp22]

progress update: new wiseco 66.75mm piston on order and local honda shop is going to bore it to wiseco's specs.
I'm going to take your guy's advice and go up a couple jet sizes, question is where would I purchase jets and how do I tell what size is in there right now?
And I've read all around on breaking it in just havent really seen if i should mix my gas with like a 32:1 ratio instead of 40:1 for the break in period, thoughts?

[SUPERBEAST]

you can get jets are jetsrus.com

[Samjp22]

thanks, itd be the main jet id go up in size correct? 300r whats the reasoning for non-synthetic break in?

[Dirtcrasher]

Some wristpins have a tight fit in the piston.

Never EVER put force on the con rod pin. Use sockets/tubing and threaded rod to "pull it out".

Piston to cylinder wall clearances depending on the person doing the work can vary. Even how the cutting tool is sharpened matters.

Wiseco puts a green paper in the box with it regarding ring end gap and P to W clearances.

High RPM's and cold temperatures in the snow overheat pretty easy; Unless you have 4SNOWS!!

Whats the plug look like, was it jetted for cooler weather??

[Samjp22]

Thanks guys and I didn't re-jet it for the colder weather and I'm still confused why multiple people say to go up in size. I know colder air is denser therefore more air into the carb but the plug was super brown. Is the summer it runs pretty rich, fouls plugs now and again but the plug looked great!

[Samjp22]

Well after waiting two long weeks to receive my piston I open it up to find this.... there's a small knick in the top of the piston. Should I ask for a refund? Or is there no worries and just run it?

[MTS]

did it come from the machine shop like that or just out of the box? you could clean it up with a stone and run it likely with no issues, as long as the ring land isnt pushed in.