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pablo Blake

Picked up 93 suzuki quadrunner 250 2x4

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Posted (edited)

Definitely gonna try that next thing im looking for is a bolt sizing chart for the atv or something along those lines cause a lot of bolts are missing. Gonna try and clean out the air filter it looks old and clogged as shit i read that i can clean it instead of replacing should i clean or replace with a k&n

Edited by pablo Blake

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You can clean it but it may be better to replace it at this point.  At some point they start to break apart and thats a bad thing should any pieces get sucked into the carburetor.    

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Posted (edited)

Will do im looking at a uni competition airfilter , Now im kinda stuck because the bike is missing a bunch of bolts and some broke. Been trying to find either a whole new set or a place with the sizes of the nuts and bolts and screws on the diagram

Edited by pablo Blake

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Good idea on the air filter and the brand is good. 
Heres a set of nuts and bolts I have used in the past. Its been great since i have used it over many projects but its $98.00. Mine has paid for itself already but there are smaller sets available.   
Metric Class 8.8 Hex Cap Flange Frame Bolts & Flange Nuts Assortment Kit - 429 Pieces! https://www.amazon.com/dp/B01LYF0OHX/ref=cm_sw_r_cp_api_i_AQDdEb7RZ6D8D

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Posted (edited)

I'm gonna go to the local hardware store and see if they have any that match up to this pitch and diameter in the same length for cheaper and just the ones i need https://specbolt.com/technical-faq/

I was looking everywhere for those numbers and specbolt just throws em at you

 

Quote

Common metric thread pitch for motorcycle and ATV uses are M4-.7, M5-.8, M6-1.0, M8-1.25, M10-1.5, M12-1.75, M14-2.0 and M16-2.0

if not theres a couple places local that make bolts that i can probably order a shipment of the ones i need from, I just dont feel like using my tap and die set on every goddamn screw/bolt to resize it to commonly available threads

Edited by pablo Blake

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It's pretty straight forward and not a big deal  finding the sizes. And if anything is too long just  throw a nut on it and cut it to size and back the nut off to clean up the edges maybe even file it down a hair. 
12mm & 10mm make up most of the sizes. 

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Alright well i got the carb cleaned and a bunch of other stuff done doesnt seem to be running as rich, but now i think its running lean i keep hearing a pinging for about 3 minutes during start up. scared to run it in place for a long time because it seems to be getting pretty hot and not sure if its getting to the point of it being dangerous

I ended up taking the whole carb off taking the float and the diaphragm and cleaning with fresh gas. Also ran a bunch through the whole carb body it self bunch of black sludge came out. Im installing a fuel line filter now, seems it doesnt have one installed someone never installed one again after changing the line i think

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Any idea where the black stuff is coming from? Tank or possibly the gas lines are breaking down inside? This does happen and you can usually tell by squeezing the hose and feel how weak it is.   If so swap the hose as well and put the filter in. Hows the inside of the tank look? 

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have you cleaned the gas tank?? it should be cleaned out. Petcock can be cleaned also.may have a screen in there also.  lets see the u-joints

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Posted (edited)

Havent checked the tank yet waiting to run more of the motor treatment through first. Now that I added this motor treatment its burning away all the carbon it smells like. Will run fine for a second and than spit white smoke like crazy on reving, Once i really start giving it just starts puffing white smoke out the back but i stuck the borescope back in and it seems to be cleaning the carbon up went from wet oil soot to cleaner pistons where i can start to see the piston is self again. It doesnt smell rich so i think i got the carb tuned in right but the engine is just blowing smoke at the moment. gotta get that air filter in change it out and see if it improves a bit, if not im guessing the top end gaskets are fucked

Already im starting to feel a totally different bike, Grabbed my portable tach and hooked it up and tuned the idle in after adjusting the carb a bit more was about 300 rpm short. Gave it some gas and really felt some power for once went from sounding like a drip carbed engine on a cart to an actual atv again

Edited by pablo Blake

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Posted (edited)

Im getting really worried as im getting it more and more tuned in im getting this kinda ringing sound, i mean i checked if its preignition doesnt seem to be, Its not like scraping metal but like a light ting that speeds up as i rev it up and eventually goes away

Tried both a hotter and cooler spark plug sounds about the same, Was gonna see if i need to adjust the ignition timing for if the chain is bad. OR if unluckily its even worse and  piston rings are worn and no good or the block it is scored, Im just hoping its not those last things

Edited by pablo Blake

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Are you sure its coming from the top end and not the clutch ? 
Only thing that comes to mind is the valve and cams up top if thats where your sure its coming from.  Pull the valve cover off and inspect everything, cam decompression device and the timing chain slack, valve clearance etc.  
What octane gasoline are you running in the bike?

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Posted (edited)

Honestly havent even refilled the gas since i got it was given to me with a full tank so i just added the motor treatment to it which said it'd raise the octane of the gas Plus add some special chemical thats ment to clean off carbon. Why would it come from the clutch? i didnt even have it in gear its sitting on stands idling just spitting smoke, Just from my limited knowledge the gas in the oil + the smoke = worn head gasket+ worn piston rings, Unless i have a full on warp of the head from someone overheating it will check the flatness of the surface when i get it off

Edited by pablo Blake

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Posted (edited)

Bad gas can cause that pinging, even with an octane booster.  I'd drain and clean the tank out, since you mentioned you were seeing a black sludge coming through.

Edited by Nick Brooks

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Posted (edited)

Well shit alright will unhook the line and drain it than flush it with some diesel and than old gas and refill with new gas, OR will the diesel hurt the tank even if its flushed? should i use kerosene instead? I've always used diesel to clean up my shit because of the high ignition threshold worse it'll do is pass it into the oil or spit it into the exhaust

Edited by pablo Blake

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You would hear the head gasket leaking. Spray the sides of the head where the gaskets are with windex and crank the engine you will see bubbles.   

I would drain the tank of all the gas and that chemical and change the oil as well. Put the proper spark plug and some 87 octane gas and see what happens. If the carburetor is adjusted properly the rest of the carbon will burn off. 

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I ussually only ran 91 in my dirt bikes worth running in this machine or nah? i mean i even ran 94 when we had it but thats long since gone

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I can only get the ethanol free in bulk at a farm supply store, only other place that sells is like a couple shops in small bottles for weed wackers n shit like that

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87 from any gas station should be fine. Get the old stuff and that chemical out and start fresh.  Double check the tank is clean and the hoses are not deteriorating inside.   
 

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