Mmmm, good point Colin On Thu, Sep 13, 2018 at 3:51 PM Colin Evans <[email protected]> wrote:
> Hi Kevin, > I had a symptom very similar to what you are describing. I spent a lot of > time checking carbs, fuel delivery, valve timing, ignition pickup etc but > was getting nowhere. Eventually I went back to the plugs. Although I could > see a spark I wanted a way to quantify it so I bought a spark tester like > the one called > “Thexton THE404 spark tester” on Amazon. About $11. It allows you to > adjust the spark gap to see at what point the coils can no longer produce a > high enough voltage to jump the gap. Very handy. > > Turns out I was doing my testing in my dim garage when I noticed with a > wide gap there was a blue spark leaping out of the coils at the spot where > they were injection molded. Closer inspection showed arcing had been going > on for a while. I suspect the plastic get very hot and eventually fails > over the years. > > Replacing the coils solved the problem completely. > > Worth a try for about $11. > > Good luck. > Colin > > > > On Thu, Sep 13, 2018 at 11:38 AM Graham Rogers <[email protected]> > wrote: > >> No need to separate them but if those low speed jets aren’t the right >> size, either gummed up or reamed out too much, they can cause trouble. Any >> rust in the tank? >> >> On Thu, Sep 13, 2018 at 2:29 PM Kevin Tsao <[email protected]> wrote: >> >>> Hmm okay, I’ll take another look at the carbs and jets. I’ll mention >>> that when I cleaned the carbs I didn’t separate them, only removed and >>> cleaned the float and vacuum bowls as well as the jets, floats, and >>> piston/needles. Thanks everyone for the input though. >>> >>> On Thu, Sep 13, 2018 at 11:20 AM Kyle Munz <[email protected]> wrote: >>> >>>> My compression has measured that low and my bike still runs. It can be >>>> a bit of a bear to get going sometimes when it's cold though. You mention >>>> needing choke and higher RPMs to keep it running. It may be worth taking >>>> another look at the low speed jets. >>>> >>>> -Kyle >>>> >>>> >>>> On Thu, Sep 13, 2018 at 12:45 PM Kevin Tsao <[email protected]> wrote: >>>> >>>>> Well the engine didn't run at all prior to me cleaning the carbs and >>>>> it wouldn't run either after I cleaned them, full choke or not. The only >>>>> way I could get some pop would be to spray starter fluid directly into the >>>>> intake after removing the carbs while cranking the engine by holding on to >>>>> the starter button. And even then it wouldn't run well, some cylinders >>>>> would fire sometimes and once in a while, and the motor wouldn't really >>>>> synchronize. The only problem the bike had prior to the day that it >>>>> wouldn't start was that it was that the bike needed full choke for while >>>>> when it was cold. Also more throttle (higher rpm) prevented it from >>>>> stalling as easily. Once the bike was warm and running, there were no >>>>> problems. After the engine wouldn't start, the first thing I checked after >>>>> spark was the carburetors, but they actually looked pretty clean and I >>>>> could see through all the jets and everything. I know for a fact there is >>>>> an issue with piston ring/cylinder wall contact, because compression went >>>>> up from 110 to 175 when I put a little oil in cylinder 1 to help seal >>>>> whatever gap there might be. I just don't know if that low compression is >>>>> the only thing preventing the engine from staring. >>>>> >>>>> On Thu, Sep 13, 2018 at 9:12 AM Lar <[email protected]> wrote: >>>>> >>>>>> Ok, so you have spark, you have fuel in the carbs as per drain line >>>>>> fuel but I wonder about your comment "especially at higher rpm" Are you >>>>>> saying the bike ran rough at slower rpm? Is it possible your carb >>>>>> cleaning >>>>>> may have dislodged something which is now made things worse? Will the >>>>>> motor >>>>>> fire at all with the choke fully on? Best of luck. >>>>>> >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> To post to this group, send email to >>>>>> [email protected]. >>>>>> Visit this group at https://groups.google.com/group/nighthawk_lovers. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To post to this group, send email to [email protected] >>>>> . >>>>> Visit this group at https://groups.google.com/group/nighthawk_lovers. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Nighthawk Motorcycle Lovers!" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at https://groups.google.com/group/nighthawk_lovers. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Nighthawk Motorcycle Lovers!" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/nighthawk_lovers. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/nighthawk_lovers. >> For more options, visit https://groups.google.com/d/optout. > > >> -- > Colin Evans > Cura Automation Projects > 3405 Bluebonnet Road > <https://maps.google.com/?q=3405+Bluebonnet+Road+North+Vancouver+BC+V7R+4C6+604&entry=gmail&source=g> > North Vancouver BC V7R 4C6 > <https://maps.google.com/?q=3405+Bluebonnet+Road+North+Vancouver+BC+V7R+4C6+604&entry=gmail&source=g> > 604 > <https://maps.google.com/?q=3405+Bluebonnet+Road+North+Vancouver+BC+V7R+4C6+604&entry=gmail&source=g> > .288.2471 > [email protected] > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/nighthawk_lovers. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. 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