So chances are that this motor was running Nitrous? If so, are there any things in particular that I need to look out for?M.F.D.B. wrote:Thats definitely vacuum port as the reed block hasnt been drilled...
Hole drilled in the jug?
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As mentioned before it could be nitrous or an Alky motor. Either of which means it was run hard. If you dont know the history on a motor your only safe choice is buy all the gaskets and tear it down for inspection, in my opinion...
Faster then Speedy Gonzalez, slower then the Road Runner!!! MEEP MEEP
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee
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I definately planned on tearing it down if it was either alky or nitrous. guess I cant be too upset since I only paid $400 for a '98 engine. I saw the hole right away and questioned buying it, but I knew for that price it wouldn't be there long. He never ran it becuase it was for a TRX conversion that he never got around to doing for $ reasons and sold it to repair his rail that his son flipped on it's lid. so when I tear it down should I expect to see anything different? I am assuming that it should have some pretty wild porting right? I couldnt see if there was any porting cuz the exhaust port is all covered with burnt oil and I never pulled the reeds.
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- Roostius_Maximus
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cast piston, i'd stil run it
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i have seen them cracked there, check by the base of the rear studs, it'll crack from the stator housing area thru into the crankcase IF its cracked up top, does looklike tool marks here tho
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Those arnt "cracks", that happens when they cast things. Every bike I have ever had apart has those "shrink lines", dont worry. Also, 2 stroke jugs all have areas where the OEM does "touch ups" after the sleeve and jug have been cast together. Its not "porting" just flash clean up...
Faster then Speedy Gonzalez, slower then the Road Runner!!! MEEP MEEP
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee
2002 CR80
1999 Cr500
2003 CR250R
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So I should just run it and not worry about it? i wasn't worried about the dremel lines at all.... just the cracks. are the dremel lines what you reffered to for "touch ups?" my jug still has the casting lines and it doesn't look live it has ever had a port or polish done. I am curious as to why they would have it set up for a vacuum pump and no other work done to the jug. although i do not have any experience with alky or nitrous bikes so that may be common... idk.M.F.D.B. wrote:Those arnt "cracks", that happens when they cast things. Every bike I have ever had apart has those "shrink lines", dont worry. Also, 2 stroke jugs all have areas where the OEM does "touch ups" after the sleeve and jug have been cast together. Its not "porting" just flash clean up...
They arnt "cracks" think of them as "wrinkles" all the motors ive ever worked on have them. As far as the unmodded motor with a fuel pump, it could be a number of things. If the motor was destined for a cart many carting rules require alcohol as a safety issue. Even a stock 500 in a cart would be super fast so they may have decided to leave the motor stock for reliability. They may have intended to mod the jug but decided against it after the hole was drilled or ran out of money and sold the motor. All kinds of "maybe's"...I wouldnt worry about specualting...
Faster then Speedy Gonzalez, slower then the Road Runner!!! MEEP MEEP
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee
- dannygraves
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IMO load and heat have more to do with it than rpm. I mean rpm will wear faster and is at a higher risk of running out of oil, but load is what creates heat. Brits cracked piston mobbed up a 1000ft sand mountain with the rear tire sunk halfway to the axle over and over and over. A kart gets prenty of load, especially with some sticky tires, but not the kind of stress a sand dune hill shooting bike sees.2strokeforever wrote:nothing, other than it prolly gets the piss reved out of it all the time... it still could be taken care of tho, but if it wasntWhats wrong with having a 500 on a kart?
kinda like buying a 125 that was only rode in the sand dunes
'09 kx450f 4-Poke
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
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'95 pw80
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
FIXEDdannygraves wrote: A kart gets prenty of load, especially with some sticky tires, but not the kind of stress a sand dune hill shooting bike with Britts fat ass riding it sees.
Faster then Speedy Gonzalez, slower then the Road Runner!!! MEEP MEEP
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee
2002 CR80
1999 Cr500
2003 CR250R
2005 CRF250R
2006 YZ450F
2005 CBR1000RR
1997 Banshee