ikeever
New member
- Joined
- Sep 10, 2003
- Messages
- 113
Just to let you guys know my experience with this mod. 2001 sxr 700. only mods related to the engine are the silencer mod, slightly leaner mains and attempted head gasket mod. So here is the scoop. I read several places about the head gasket mod, taking 1 or 2 pieces out of the 3. well i tried taking out 2 and just working with 1 piece sprayed with a heavy coating of high tac. well this is my findings: i do think it made throttle notably snappier...maybe started a little easier due to high compression
now for the bad, sled ran great for 100 miles, then it would intermittently get hot on me and blow coolant out the reservoir. didn't really think it was gasket related due to the fact it didn't get hot for 100 miles. so i bleed and pressure checked and vacuum checked and bleed some more on and on. cap checked good at 17lbs, system held pressure 16lbs for 3 hours, and system held vacuum at 25 inches for 3 hours. block tester wasn't showing any CO2 gas in the coolant. so i thought that maybe the engine with the higher compression was making to much heat for the coolant system. upon pulling the head to inspect the gasket i found the leak on the pto cylinder. compression was bleeding into the coolant system. i was on a trip so i just put all new 3 layer gaskets back on to get back on the trail. no more overheating. my guess is the high tac was able to hold a good seal for the 100 miles and then either melted out or burned out ...worked out...something.
takeaways...maybe impossible to get a good seal with one layer thick due to the mono head design, there is just too much warping and expanding in the head. maybe with 2 layer thick you might get a seal, don't know. if you are going to do the mod...take the head to the shop and have it machined .020 for 100 bucks and keep the 3 layer thickness on the gasket. i think you need it allow for the head design. if it were a triple style head like the srx, maybe a single head gasket thickness would work, not sure.
lastly, i do think the mod add some crispness on the lower end, and the sled seemed to start better when cold. however when hot, started with a backfire 50% of the time. the backfire maybe related to pilots too lean, but the backfiring seemed to lessen once all 3 layers were put back in. the hotter the sled ...when you try and star...t the better chance the backfire. i always ran premium gas.
take this post for what its worth...just information to read.
i wish more people would take the time to post stories and findings like this many times you get the Q's and problems, but never post the solution or findings. maybe they are too busy riding to say they got it fixed...obviously
now for the bad, sled ran great for 100 miles, then it would intermittently get hot on me and blow coolant out the reservoir. didn't really think it was gasket related due to the fact it didn't get hot for 100 miles. so i bleed and pressure checked and vacuum checked and bleed some more on and on. cap checked good at 17lbs, system held pressure 16lbs for 3 hours, and system held vacuum at 25 inches for 3 hours. block tester wasn't showing any CO2 gas in the coolant. so i thought that maybe the engine with the higher compression was making to much heat for the coolant system. upon pulling the head to inspect the gasket i found the leak on the pto cylinder. compression was bleeding into the coolant system. i was on a trip so i just put all new 3 layer gaskets back on to get back on the trail. no more overheating. my guess is the high tac was able to hold a good seal for the 100 miles and then either melted out or burned out ...worked out...something.
takeaways...maybe impossible to get a good seal with one layer thick due to the mono head design, there is just too much warping and expanding in the head. maybe with 2 layer thick you might get a seal, don't know. if you are going to do the mod...take the head to the shop and have it machined .020 for 100 bucks and keep the 3 layer thickness on the gasket. i think you need it allow for the head design. if it were a triple style head like the srx, maybe a single head gasket thickness would work, not sure.
lastly, i do think the mod add some crispness on the lower end, and the sled seemed to start better when cold. however when hot, started with a backfire 50% of the time. the backfire maybe related to pilots too lean, but the backfiring seemed to lessen once all 3 layers were put back in. the hotter the sled ...when you try and star...t the better chance the backfire. i always ran premium gas.
take this post for what its worth...just information to read.
i wish more people would take the time to post stories and findings like this many times you get the Q's and problems, but never post the solution or findings. maybe they are too busy riding to say they got it fixed...obviously
harness racer
New member
- did you bleed the rear cooler by removing the seat ????
-removing a layer of gasket (middle one) may require richer jetting aswell if you were leaned out already may have been a good idea to fatten her up a little especially on the pto .
-many many many thousands of miles with 1 layer 2 layers and never had those issues
-removing a layer of gasket (middle one) may require richer jetting aswell if you were leaned out already may have been a good idea to fatten her up a little especially on the pto .
-many many many thousands of miles with 1 layer 2 layers and never had those issues
ikeever
New member
- Joined
- Sep 10, 2003
- Messages
- 113
i bled per spec in the book with removing the seat...i also tried my snap on tool that puts a vacuum on the system....then pulls the coolant in with the vacuum set on the system, got it to take the amount listed in the coolant capacity. i know for sure the gasket on the pto side was leaking because the head gasket had a washed clean spot...i could see exactly were it was leaking through the gasket. when you get your single thick gasket to seal are you using any spray? copper? high tack? etc. thanks for your follow up
harness racer
New member
i have used and re-used the same gasket with and without spray on many engines
im not telling or suggesting anyone try it or not try it but i remember one leak i had on probably 20 red head mods .
im not telling or suggesting anyone try it or not try it but i remember one leak i had on probably 20 red head mods .
i peeled the center layer 10000 miles ago and never had an issue. I think peeling 2 layers is asking for trouble. if you do it right the first time you wont be backtracking.
gild
New member
case sealer
one layer with case sealer running triple pipes and no leaks in 9,000 ks. always clean head bolts, nuts & washers lubricate threads and washers for proper torque
one layer with case sealer running triple pipes and no leaks in 9,000 ks. always clean head bolts, nuts & washers lubricate threads and washers for proper torque