08-30-2018, 07:55 AM | #16 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
|
Quote:
Personally I would increase compression without a oil cooler. There are a few other members on here that can confirm the benefits of adding an oil cooler. Especially if you live where you have extreme heat like I do. The proof is in oil when I change it. Going from black nasty oil at 500 mile to dark brown oil that you can see through at 1000 mile oil changes. Just sayin.
__________________
2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
|
|
08-30-2018, 10:48 AM | #17 |
Join Date: Aug 2018
Posts: 158
|
I use synthetic motorcycle oil, its more expensive, but it keeps its color and consistency longer, the conventional oil went extremely black for me pretty fast. I pretty much constantly abuse the hawk. On and off the track. I do lots of city driving.
When I first got the hawk, the throttle was not sitting right from previous owner, and was stuck in WOT. I didn't know, and this being my first motorcycle, was oblivious it wasn't supposed to idle so high(or loud.) and during "warm up" the header turned a cherry red and the exhaust cover caught fire on the stock muffler.... I figured out and solved thst issue. Hawk engine has run like a champ since that. I've put the clone mikuni on. What would be some symptoms of overheating an air cooled engine? I am certain an oil cooler would run better, But I'm thinking i might not want one due to issues if I wiped out(especially off-road in the middle of no where, I ride my hawk out there) And because I'd like to save as much weight as possible, especially since I plan on racing. The hawk isn't a feather, but she isn't heavy whatsoever. |
|
08-30-2018, 10:50 AM | #18 |
Join Date: Aug 2018
Posts: 158
|
And aftermarket exhaust. I'm in the middle of Texas. I've been riding every day. 95-105 has been pretty normal for me between working outside and riding my hawk.
|
|
08-30-2018, 10:58 AM | #19 |
Join Date: Jul 2018
Posts: 212
|
Synthetic motorcycle oil is the way to go after the engine has gone through break-in (500 miles and up, synthetic should be the staple). It'll run your engine as much as 10-20°F cooler than conventional "SAE" oil. Synthetics lubricate better, run at more consistent viscosity at low and higher temps, and are less prone to oil sludge problems. Your oil change intervals can also be doubled compared to how often you'd change conventional oil. Overall the cost of synthetic oil isn't bad considering how long many extra miles you can get out of it.
__________________
2018 RPS Hawk 250cc Mods so far: 1. Mikuni VM26 Carburetor w/#115 main jet 2. 17T/45T JT sprockets 3. JT 428 X-ring chain 4. Air box mod 5. Hawk Digital Cluster 6. Aftermarket IMS shift lever 7. Performance Aftermarket Exhaust 8. 295mm Nitrogen Gas Monoshock, 20W oil front forks |
|
08-30-2018, 06:42 PM | #20 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
|
Quote:
|
|
|
08-31-2018, 07:11 PM | #21 |
Join Date: Aug 2018
Posts: 158
|
Any tips for taking off the valve springs and the valves? i need a special tool don't i?
|
|
08-31-2018, 07:12 PM | #22 |
Join Date: Aug 2018
Posts: 158
|
I'm about to go pick up sand paper and a caliper.
|
|
09-01-2018, 12:47 PM | #23 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
|
This type works for me: https://www.ebay.com/itm/5-Sizes-Val...sAAOSwN6JY~5-I
__________________
Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
|
09-01-2018, 01:49 PM | #24 | |
Join Date: Jun 2011
Posts: 1,335
|
Quote:
I've tried synthetic oils. They burn off quick. My CB500X goes through a quart over 3000 miles. It has 7500-mile oil change intervals. I went back to good old Rotella T 15w40 diesel oil and haven't burnt a drop. I still change the oil and filter every 3000 miles. My other seven bikes burn off syntetic as well. They to get the good old Rotella T diesel oil and don't burn it. |
|
|
09-02-2018, 03:00 PM | #25 |
Join Date: Feb 2018
Location: LA
Posts: 74
|
Remedies for high compression, thoughts on oil
Prevent knock by; Higher octane fuel, or octane boost or mixing in oil M.M.? Running richer fuel 2 air mixture
Cooler plug? retarded timing, increased airflow around the engine, ie sandblast that black shit off of the cooling fins?, not running wide open throttle continuously. H2O/alky injection, mini oil cooler mounted high, ie crash proof, Hell in cold climates it could help heat the driver. Thoughts, conerns, comments or questions? Anybody here own a diesel engine? 20 seconds after starting after an oil change the oil goes coal black due 2 13+ compression ratios. I've always read that the main reason to change motorcycle oil frequently is because of the wet transmission gears shredding the microscopic hairs of the oil. I think it's more mental Psych the color of the oil. But those gear teeth shredding the oil, wow! Last edited by Gh426; 09-02-2018 at 03:57 PM. |
|
09-02-2018, 04:37 PM | #26 | |
Join Date: Dec 2015
Location: CO
Posts: 1,525
|
Quote:
Loose/out of spec piston ring tolerance? Faulty emissions components? Never had a problem myself (Synthetic Oil 4 Life) I must be using all my good luck on synthetic oils working in my engines/transmissions... maybe I should buy conventional oil and some lotto tix instead
__________________
"Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P. |
|
|
09-02-2018, 07:27 PM | #27 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
|
Quote:
__________________
2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
|
|
09-02-2018, 09:53 PM | #28 | |
Join Date: Jun 2011
Posts: 1,335
|
Quote:
|
|
|
09-03-2018, 06:19 AM | #29 |
Join Date: Aug 2018
Posts: 158
|
I shaved off 1mm aswell as installing a thinner head gasket i got from csc. The tt250 head gasket is about half a mm shorter thsn the stock gasket that was on the hawk. But it had a slight ridge, its probbaly about .25mm when compressed.
I'm not sure the compression ratio now, but it runs great! I didn't do as aggressive porting as I was going to, but smoothed out the initial ridge in the intake, and took a decent bit of material from the exhaust. I probably could have gone wider, But since it's my first time porting i didnt want to go too crazy. I focused on the ridges right under the valve seat and removed a decent bit from the bump where the valve guide goes, especially at the corners on the exhaust. would have spent more time, but since it's my daily transport.... I might do some more intense porting In the future if I decide i want some more performance parts in the engine. I'll post some pictures tomorrow of tsking it apart I've noticed a nice increase in torque throughout the engine range. I can get the front wheel to come up in third gear with just the throttle. I couldnt get it to do that before! maybe if I popped the clutch and really pulled on the bars. I'm running 15/44 sprockets. The jetting is a little off now, but ill work on that. |
|
09-03-2018, 12:04 PM | #30 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
|
What? No pictures? We like to see what you have done porting wise.
__________________
2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
|
|
|
|
|