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Post by mkksat13 on May 5, 2023 14:00:29 GMT -5
I installed a Technigas Silent Pro on my 2T bugeye that has stock carb and 70bbk. Ever since, this bike does not want to run! After about a mile of running it down the road it just dies on me. And after it dies, it is impossible to restart until it sits for about 20 minutes, which seems like a “cool down” period to me. I can also duplicate this behavior on the center stand in the garage. The bike ran great before the muffler swap. I thought this would be an easy swap since I installed same muffler on my stock prebug and had zero issues. Any ideas? Is it because this bugeye has a 70bbk?
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Post by Zino on May 5, 2023 14:26:41 GMT -5
Do you have a temp gauge ?
By your symptoms it sounds like it is seizing from over heating .
This is exhaust only has one place to leak and that is where it hooks up to cylinder.
Try this to see if you have a air leak in your exhaust .
With a gloved hand and the scooter running take a wet rag and plug the end of the exhaust .
If it kills quick you do not have a exhaust leak
If it keeps running you have ann exhaust leak and probably need a new exhaust gasket .
I use permatex ultra copper with my gaskets and let them cure for a full day so I cut down on exhaust leaks
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Post by mkksat13 on May 5, 2023 18:05:57 GMT -5
Would a leak at the exhaust gasket cause a soft seize? I do have a hand-held shoot-it kind of temp gauge and after I walked bike back home I did check a few spots with it. Right where the reed block area is was about 98 deg, and the muffler body was about 115 degrees. Are those high? I will do the gasket test in a couple days and advise. Thanks!
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Post by Zino on May 5, 2023 22:33:56 GMT -5
a leaking exhaust seal will cause a soft seize
you have extra air being pulled into the cylinder on every rotation and it gets worse with higher rpms
those temps are not high at reed block or exhaust .
The wet rag test takes like 30 seconds .
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Post by mkksat13 on May 6, 2023 5:02:57 GMT -5
There was a tightly spooled ring/gasket that came off the stock exhaust and I did not use it when I put the new one on. Should I have?
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Post by Zino on May 6, 2023 7:24:02 GMT -5
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Post by bigmatthew86 on May 6, 2023 10:57:09 GMT -5
Yes if you don’t have an exhaust gasket that’s your problem.
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Post by mkksat13 on May 6, 2023 11:39:56 GMT -5
I did the wet rag test and the bike died instantly. I sprayed some contact cleaner (out of carb stuff) around the reed block area and the RPM’s decreased momentarily, then went back up. I had installed the gasket that came with the Technigas with a little sealant originally. I am at my wits end and hubby wants to toss the bike. I just keep thinking it has to be exhaust related because it ran great before I switched it out. I wish I had the old one to see, but hubby also tossed that. I’m ordering a new intake manifold and gasket and see what that does. I’ll update next week. Thanks for help!
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Post by Zino on May 6, 2023 12:58:58 GMT -5
So exhaust is sealed
Your spray test around the manifold has found an air leak there .
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Post by mkksat13 on May 7, 2023 20:35:35 GMT -5
Quick question, when I install the intake gasket against the case, should I use RTV or something like that? I remember reading somewhere that you should, but I know originally there's nothing.
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Post by bigmatthew86 on May 7, 2023 21:17:24 GMT -5
A thin layer won’t hurt. I’ve done it plenty of times without too.
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Post by Zino on May 8, 2023 7:05:41 GMT -5
The ultra copper seal I use is a RTV sealant
Just enough RTV spread on like a thin film to give it color any more than that is too much you want it to fill in the imperfections in the gasket and pipe /cylinder and not spooge all over
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Post by mkksat13 on May 8, 2023 10:51:12 GMT -5
Okay, the RTV is okay to use at the reed block?
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Post by Zino on May 8, 2023 15:35:49 GMT -5
Okay, the RTV is okay to use at the reed block? Yes |
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Post by kosmos on May 8, 2023 22:24:19 GMT -5
I use paper gaskets and they work just fine. Just when you remove them, they usually will stick and rip. So, I like to take new gaskets and cover them with that grease in a tub. like wheel bearing grease. As long as its a good stock gasket you shouldn't worry. (they never mess up; making them). If you put a layer of bearing grease on them, when you remove them theyll basically be cooked and won't ripe apart when you take it apart.  Also watch out for imperfections in new reed blocks like this one from aftermarket or anybody. It had some punch out holes jammed into it making for a 1mm gasket sealing area that was about impossible to seal for me. Also you can cut out your own gaskets from gasket paper but that might be too hard. And use an exhaust gasket always when you reinstall an exhaust. |
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