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Thread: My trek build
12-10-2007 #1blacklabel7345 Guest
My trek build
started my build two days ago. Right now im fabing some cutom brackets to take care of the carb clerance issue. These things are lot harder to put together than i thought, but not to worry, the bike should be ready in a couple of days.
one question that i cant find a straight answer to is do i have to put oil in the crank case and i i do:
1. Were do i put it in
2. what kind o oil do i use
thanks all, willl have some pics and news soon
12-10-2007 #2JemmaUK Guest
What engine are you using?
If you are running a two stroke you mix the oil in with the fuel... mixtures vary from 16:1 to 50:1 petroil. On a two stroke you will destroy the engine in short order if you feed it with pure petrol.
With the 4 stroke engines there should be an indication of where you put the oil in.
good luck with getting your bike on the road..
12-10-2007 #3blacklabel7345 Guest
im using an 80cc 2 stroke. I know that i hvae to mix gas 25:1 but no one said anything about crank case oil. I dont know too much about 2 strokrs, now i this thing was chevy powered it would be a diff. story
12-10-2007 #4gone_fishin Guest
as jemma says...your 2-stroke is lubricated thru the pre-mixed fuel...my personal recommendation is 20:1 for break-in.
i'm sure your work will be mechanically sound, but i think i should say that you may want to take it slow as you learn about operating one of these engines... spend some time searching out and reading the posts of the hundreds who've built before you. there's a big boost in overall happy-time-ness if you get it right the first time, and many (avoidable) pitfalls for the uninitiated
12-10-2007 #6JemmaUK Guest
Use a good quality oil and when you've gotten it on the road run it for a while and recheck all bolts and connections...
My personal machine is a GEBE 2-stroke (my second, the first got nicked)
12-10-2007 #7blacklabel7345 Guest
thanks everyone for the support. Im still having horrable clerance issues on my treck, but, hopefully ill get something figured out
12-10-2007 #8blacklabel7345 Guest
i was looking around and went to the sppokytooth website and found that i can get an engine on something the size of my trek. now i can get the engine in quite nicely, but i have to tilt it. this brings my next question:
does the carb have to be upright(bowl on bottom) or can i hvae it tilted a littlebit sideways? if i tip the engine forward a couple of degrees i hvae no problem, but this is a carb and the float is in the bowl and if i tilt it will it stilll work?
12-10-2007 #9kevbo Guest
Note that you can't fill the crankcase with oil, because most (there are a few exceptions) 2-strokes use the crankcase to pump the intake charge into the cylinder. So any oil in the crankcase eventually ends up in the combustion chamber.
12-10-2007 #10noah Guest
re: carb tilting
Tilting carb slightly, very slightly probably won't affect too much other than looks but one option that worked for me was to take the bottom bracket from the front mount and to use it as a spacer for the rear mount on the motor side of the frame. Can you picture it... then you take the adapter plate and use that on the front... Mine went right down thru a water bottle screw hole on the front (after i drilled it out of course) , I hope you understand this, if not pm me for my telephone #....I have a trek 800 sport, a little older model.
Last edited by noah; 12-11-2007 at 08:51 AM.
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