BannedCR500Riders.com

I just grenaded my top end finally, and it's time for a rebuild. My question is for you guys that are running Glenn's race port, how long do they last? I ride primarily open desert/dunes And need more top end but I don't want to sacrifice reliability (it was a long walk to the truck when this motor seized). Also what kind of fuel do you run? I can get 100 octane at the local 76 station, just wondering if they will run on that. I'm also considering the 250 ignition swap if I can find the parts.

It should be just as reliable as stock porting. I run alot of clearance, so I'm changing top ends frequently.

I run VP U4.2 fuel, and C12 works good as well. Can't speak for the 100 octane pump stuff.

Glen does great work, don't let Uncle Rico the Webrider (100hphonda) tell you otherwise.

Thanks for the reply. I've heard way more good than bad about Glenn (long time lurker), and that many hoons can't be wrong. I wanted to try the 540 cc "Liger" jug I read about on the main site but I can't get ahold of the bastards. I'll call gss when i get the motor tore down and figure out what the damages are.

tacogrande wrote:Thanks for the reply. I've heard way more good than bad about Glenn (long time lurker), and that many hoons can't be wrong. I wanted to try the 540 cc "Liger" jug I read about on the main site but I can't get ahold of the bastards. I'll call gss when i get the motor tore down and figure out what the damages are.

CPI has a 583 jug, might want to take a peek at that too.

Glen drills a shitload of holes in the race port pistons and im almost 100% positive they have saved my motor countless times from melting.

Ive boiled the bike many times and once cooked it to the point where it died and wouldnt restart untill cooled, without the holes in the piston I guarantee it would have been a moulten mess.



So Id say a ton more reliable than stock

BTW all thecooling issues have been fixed now

Well shit that's good to hear. When I get this thing put back together we'll have to go for a rip brit, coppercity and calico are within a tank from my place. What pipe do you run? I need a new one. Got it pulled apart and the wiseco cracked a skirt and vaporized it into aluminum dust and melted it to the jug. Doh.

I run a few diff pipes, im running a noleen rite now as the motor seems to like it more.

i heard ported&polished was saving his pennys for a gss race port

tacogrande wrote:Well shit that's good to hear. When I get this thing put back together we'll have to go for a rip brit, coppercity and calico are within a tank from my place. .

Fuk yea lets roll out

Where are you located?

Out by the dry lake on the way to Irwin. I'm not sure why the wiseco busted up, but it made a mess when it did. 5th gear tapped~

Thats a weird place for it to break, you sure the crank isnt coming apart and a chunk of bearing dint cause that damage?

It could also be that the clearance got out spec and cracked/broke the piston.

You got anymore pics of that piston?

Just this one. It's weird it has hairline cracks all around the skirt and the pipe was coated in aluminum dust. The crank is tight, same with the rod. No play at all, smooth spinning by hand and no debris in the crankcase, most of it went out the pipe at WOT.

Well, I shipped my entire motor off to Glenn for new crank bearings, bottom end seals, the new race port, and to bore my carb. It was a tough decision choosing the right shop, but after talking to Glenn I feel confident he will do a great job. There are just some things in life you can't learn from books, and the art of tuning a half liter two stroke is one of them. I got a 250 ignition off ebay in case it's not scary enough for me too.

I just got back my bored PWK and Trailport jug and piston from Glen, man his work is beautiful, you can tell he takes allot of pride in what he does. I cant wait to get it all back together, I also have a 250 ignition to fit, a 98 digital.

fastkart wrote:It could also be that the clearance got out spec and cracked/broke the piston.

i thought that you kart guys run alot of clearence!!

so how much is tooooo! much for kart engines???

I usually run .006-.007, but the top ends get changed every 8-10 races and rings every 4-5. It's done that way to get the piston out before it cracks. If it gets run too long and cracks, it will look like the pic he posted.