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Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 12:54 am
by johnny248
1man8scoots wrote:If it works it's ok. It wouldn't modify the signal as long as you put it in the same exact place the other one was in. Pretty nice to know you can use the pick up from the af05e.
OK, just checking. They looked like the same part, but one never knows. Simply cut the one, soldered and heat shrink it on the other. They pretty much only mount in one way from what I can see.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 1:04 am
by johnny248
I need to get another compression tester. I let someone borrow mine, and after getting it back it was reading way out of whack. I used it on a car engine and it was reading 30-40lbs low, so I don't trust it anymore.
As I said before though, I currently have a MHR paper gasket on it, not the metal Polini.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 1:33 am
by johnny248
So what works on a scooter for compression? Just becuase I'm sitting here, I cut out a base gasket from some material. It's paper/rubber 1/32". If I end up needing it. First thing is first. I'll pull out the engine this week and try to pressure test it. I'll see if I can check compression somehow, but what should i use if an automotive one is no good? Assuming that there are no leaks, and the compression is high, I can try this thicker vase gasket i guess.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 1:36 am
by johnny248
graphite9 wrote:. Johnny, I really applaud you for sticking with this. Its not easy, we have all been there. Keep it up, your getting close!
I appreciate all of your guys help. As frustrated and * off as I am with this thing right now, the thought of all the money and time I have spent on this thing to just sit in a pile not doing anything drives me crazy, or I guess keeps me motivated lol
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 1:51 am
by johnny248
What is the min compression for these to run?
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:13 am
by 1man8scoots
bigwheeler32 wrote:i'm gonna say that a car ones fine. thats what every motorcycle person uses. you have to be able to read 170-180 psi someimtes... my car has 165 psi i use the same compression guage as for the scooter. its a little 1.8l.
its just the shraeder valve is different becuase its gotta be able to take 240+ psi at a time at once, instead of like a car tire, or a basketball, and only 30psi or 40psi. only place ive seen for those shraeder valves are amazon, might be able to get one on ebay. or maybe even local if you ask for a high compression one. dont know anything that might use it. try taking the shreader valve out and kick the scooter with the tester in and see if it shows higher than 30-40psi in one kick that would tell you if the shraeder valve has been replaced. you should be able to do a higher kick.
Wrong... tires do not stop at 40 psi. Why would you say this? This is wrong. Wrong as it can be. Go to a freaking parts store and try to find the mythical low psi shraeder valve or the even more mythical high pressure shraeder valve.
I'm assuming you've never owned a big truck, van, or bus with off road tires.... minimum inflation is 80 psi. Same shraeder valve used on a 75 El camino, 96 toyota corrola, 01 land Rover disco, 95 bluebird bus, or 2015 corvette is all the same valve.
Be correct or be corrected.
I have both the automotive and the motorcycle snap on comp test kits... only part number that is different is 1 hose... that one hose is for recessed and tapered holes that a lot of 4t bikes use.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:16 am
by 1man8scoots
Minimum to ignite a wet far is around 80 psi for mina style, minimum for vert of any style is around 90. Vert needs more comp due to the nature of the design. Some vespa from the factory have 100 or less psi. And some other vespa have 150 from the factory.
These are facts from doing comp tests every day I'm at the shop on so many different makes and styles of engines.
A typical day may be build a tgb morini at 10 am, stella 2t at 1 pm, kymco super 8 at 3 pm, geniune buddy 50 at 5 to end the day. All needed comp tests before moving forward.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:20 am
by johnny248
This is hard to explain since I've had to apart so many times, but after I filed the case flat and put it together with a metal Corsa gasket and ran compression (it has come apart and gone back together since then) I was only reading like 50-60psi on the gauge, but it ran good other than the temp. That was with a standard "auto" tester with about an 18" hose.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:24 am
by 1man8scoots
The length of the hose does not matter. There is a shraeder valve in the very tip of the hose that connects to your engine that only pulls in pressure that has been produced before the shraeder valve. The length of the tip that protrudes into the head/combustion area will effect the cr. Why you may ask, because the volume your plug tip takes up is gone now. Imagine taking away material from the combustion chamber (your head), you know have more volume in the chamber which leads to more area for the charge to expand, which is less of a bang. Less area less room for expansion, more bang.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:26 am
by johnny248
The shrader valve is up at the gauge. The hose adds more volume to compress.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:27 am
by 1man8scoots
You can make your comp gauge inaccurate by dropping it, knocking it off of a shock while uninstaling, or they can be defective from the get go like most harbor freight or cheap ones are.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:28 am
by 1man8scoots
johnny248 wrote:The shrader valve is up at the gauge. The hose adds more volume to compress.
Wrong. Look at the end of your hose.... wow.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:29 am
by 1man8scoots
I'm just going to walk away. If you're not willing to listen and just make assumptions with out looking for yourself I can't help.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:29 am
by johnny248
1man8scoots wrote:johnny248 wrote:The shrader valve is up at the gauge. The hose adds more volume to compress.
Wrong. Look at the end of your hose.... wow.
Maybe this one is just retarded, but the shrader valve is on the metal fitting where the pressure release is, and the hose is just a hose with a disconnect on one end and plug threads on the other.
Re: Any possibility of "bad" carb causing overheating?
Posted: Mon Aug 03, 2015 10:32 am
by johnny248
1man8scoots wrote:I'm just going to walk away. If you're not willing to listen and just make assumptions with out looking for yourself I can't help.
Whoa, I'm not. Read the next post.