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crash! can't figure out why?

crash! can't figure out why?

Postby mschlake21 » Thu Jun 29, 2017 8:45 am

My roommate has a 70 bonneville t120 thats in original condition. its wore out here and there but it looks pretty good for the most part. we ride together often. My norton has been giving me fits getting going so i was on another bike behind him. his bike was running fine, idling fine, sounded ok. After making a stop at a stop sign, we began accelerating and his bike reved all the way up, spun the back tire out and dumped him right there in the street. Mirror got smashed, footage rubber ripped apart, and the choke lever is broken, but all and all, no real damage. his bike went back into the garage and he began to fix somethings on it while it was out of commission. The carbs are clean now and he kicked it over and it went straight to redline again. all cable routing was checked, valve clearances checked, carbs clean. thoughts?

doesn't matter if its in gear or not, its WOT as soon as it fires. again, ran fine until it happened, now I'm not sure what to do
1974 Norton Commando 850
1969 BSA A65 Firebird
1978 XS650

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Re: crash! can't figure out why?

Postby Rocker » Sat Jul 01, 2017 2:25 pm

You say the carbs are clean but when at start up are the throttle slides at the bottom? if they're not she will rev out :evil:

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Re: crash! can't figure out why?

Postby grandpaul » Wed Jul 05, 2017 10:09 am

Sounds like a stuck carb slide
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Re: crash! can't figure out why?

Postby Triton Thrasher » Wed Jul 05, 2017 11:24 am

It certainly won't "go to red line" if the throttle slides are sitting at the bottom.

It's pretty basic.
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Re: crash! can't figure out why?

Postby mschlake21 » Fri Jul 07, 2017 5:01 pm

ill look again whenever I'm back over there. they were at the bottom when i looked at it, seemed to return alright when i checked the throttle opening and closing. i was just seeing if anybody had anything else that i hadn't thought of already. strange that it would return normally and then stop randomly. ill update when i check again
1974 Norton Commando 850
1969 BSA A65 Firebird
1978 XS650

mschlake21
Posts: 45
Joined: Tue Jun 23, 2015 8:27 am
Location: Oklahoma City, Oklahoma

Re: crash! can't figure out why?

Postby B+Bogus » Fri Jul 14, 2017 5:19 am

If the insulating spacers (reddish-brown, look like thick gaskets) are missing between the carbs and the manifolds the carbs can get hot, the bodies distort and the slides will get stuck open.
I can confirm this from personal experience...
Cheers,

Andy

1974 Roadster & Interstate
1964 650SS CR
1971 PR project
1975 Ducati 900ss x2
1975 Triumph T160
1976 Triumph T140
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