erik58

My Feedback: (4)

Looking for a rocker arm for a 90t twin. I think that maybe a rocker from a .45 mybe work. Thank you Erik

1200SportsterRider

Which 90, the 90-T or the 90-TS? Thanks

Saito 90-TS

Saito 90-T

erik58

My Feedback: (4)

it’s a 90t just flying it and it dropped a cylinder can’t explaine why it broke

the Wasp

My Feedback: (1)

you have to look at it this way> that cylinder flamed out for the same reason (s) any single cylinder would have, so start ruling out the things you know where not the reasons.

after you rule out the usuals my thoughts and questions would be,

A) do you run it rather rich? richer than you would a single cylinder? if so you may need a hotter plug to burn all that extra fuel and oil.
B) what size prop? do you run a small prop with more pitch? I ask this because I have seen 4st's flame-out simply because their props were to small. a 13" 2 blade is too small for a 160 4st LOL. <that engine was NOT loaded correctly with that 13" prop! a longer prop has more momentum, it creates more flywheel affect. I gave that guy a 15" prop and his problem went away instantly, he didn't even re tune.
C) do you run a rather large prop like a 15" or 16" prop? if so you may need a hotter plug because your engine responds slower to fast throttle inputs and richer settings..

Jim

1200SportsterRider

https://www.horizonhobby.com/product/rockera-kqsxyaaddeeiijjkkasbmbzbsca-cf/SAI5041.html The engine code for the 90-T is Q for the MKII, the version does not change the part number.

https://www.hobbyplastic.co.uk/index.php?main_page=product_info&cPath=88_95_136_137&products_id=2722&zenid=6pqpc6s7a6906ebn7j0b0l95j5 In stock here.
Be sure to use a strong hardened screw driver on the rocker pin, some turn really hard until they break loose.

erik58

My Feedback: (4)

Thank you I’ll give it a try